EBICO EP GE Series

Manual of Large Industrial Burner
Natural Gas
EP GE Series
LOW NOX Electronic Proportional
Adjustment Burner
General Specification
Before using the burner, please read this manual carefully. If you have any questions, please
contact sales companies to avoid malfunctions and dangers. If you use non-original accessories,
serious dangerous accidents will be likely to occur; meanwhile you will waive the right to
guarantee quality and free services.
1. General
Safety
To ensure the safe operation of the burner, it must be installed and commissioned by qualified
professionals correctly in accordance with this manual, with particular attention to relevant
installation and safety regulations.
Flame monitoring device, restricting device, control device and other safety devices can only be
installed by the manufacturer or its consignor.
Failure to comply with the regulations may result in serious consequences such as
personal injury and death and major material loss.
Personnel qualification
Qualified personnel set out in this manual refer to those who are familiar with installation and
commissioning and have sufficient ability to perform their work, such as:
Those trained and capable of operating, grounding and labeling electrical appliances according to
electrical safety technical standards;
Those trained and capable of installing, commissioning, and repairing gas installations on the site;
Those trained and able and permitted to handle fuels at various hazard levels in accordance with
safety regulations on flammable fluids
Code of Practice for Equipment Room

The equipment room is designed in compliance with the code of practice for equipment room, and
the emergency switch, main gas cut-off device, exhaust hole and ventilation device should be
checked.
The shortcomings in the inspection report should be recorded and improved to meet the
requirements of the code.
The commissioning report must be signed by the factory management or its representative, and
the personnel operating the equipment must obtain necessary guidance and corresponding
qualification certificates. The manual should be displayed at a conspicuous place in the
equipment room.
Please pay attention to the following points before installation:

Confirm the nature of gas and other important parameters:
1. Gas type and composition;
2. Low calorific value Hu = kWh/Nm3 (kcal/Nm3);
3. Gas supply pressure;
4. Equipment hearth size and hearth back pressure;
5. The altitude where the equipment is located.
Gas pipeline
Gas should be sent to the burner in the shortest distance. The pressure loss should be as small
as possible.
The diameter of the air supply pipe is at least one size larger than that of the valve block of the
burner.
The inner wall of the pipeline must be derusted and garbage removed before use.
1
Pipe tightness test
The tightness of internal and external pipelines must be predicted and generally measured.
Prediction: Without the valve block, use more than 1bar air (not oxygen) or inert gas for prediction.
General measurement of the assembled pipeline system: all pipelines from the main stop valve to
the stop valve on the burner are measured with twice the working pressure of air (not oxygen) or
inert gas when the solenoid valve has been closed, while the pressure should be higher than
100mbar at least but should not be higher than the maximum working pressure of the valve block.
The connections should be painted with foam or other materials that will not cause corrosion.
Do not put the leaking pipelines into operation.
Gas meter
The installation position, range and type of the gas meter are determined by the gas supply
department.
Note!
The tightness test shall be carried out after each installation and maintenance.
1.1 Common terms in this manual
Before installing, using and repairing the burner, read the instructions carefully. The specified
instructions must be followed.
The following three signs mentioned in this book indicate very important information.
Danger! Hazard sign shows where it may cause physical injury and life danger
Danger
Danger! Hazard sign shows where it may cause damage to the equipment or its
components or pollution to the environment
warning
！ Attention signs show art skills, tips and other important information
Note
1.2 Overview
This is a fully automatic electronic proportional center ultra-mixed internal reflux ultra-low nitrogen
gas burner. This burner is generally used in heating equipment such as hot water boilers, steam
boilers, heat-conducting oil furnaces and air heating furnaces.
When using a second gas instead of natural gas, the gas composition must be known. And
consult the manufacturer or representative office to know clearly whether this gas can be used.
Do not use open flame near the burner or boiler. It is forbidden to store any
flammable materials in the boiler room.
Danger
2
If there is a gas leak
Do not ignite or start live equipment
Close the main air valve
Make sure the leakage area is well ventilated
Danger
Contact Operations Manager
Organize urgent repair
When the burner is used for the first time, the pipeline must be purged with
！ nitrogen, and parts that may be damaged during the purging must be removed, in
order to prevent welding slag or foreign objects from clogging the equipment, so
Note that it cannot be used normally.
If the burner fails to be ignited once, it shall be notified to the maintenance

personnel to find out the reason and then ignite again. It is strictly forbidden to
Danger ignite it repeatedly.
Check the following items when burning natural gas:

 Before installation, you should know some basic characteristics of gas first, such as gas
composition, calorific value and gas supply pressure.
 The gas pipe of the burner must be installed in compliance with the requirements of
relevant regulations and guidelines.
 In general, the diameter of the gas supply pipeline should be at least one size larger than
that of the burner valve block, and attention is paid to the correct and installation
sequence and direction of the valve block components arranged firmly.
 The inner wall of the gas pipeline should be purged, cleaned of garbage, and
anti-corrosion treated, such as galvanizing and protective paint. The electropneumatic
valve block should be installed as close to the gas butterfly valve as possible.
 Note: After installation, the pipeline is cleaned with compressed air, and parts that may
be damaged during the cleaning must be removed, to prevent welding slag or other
foreign objects from blocking the solenoid valve.
 The hot air burner must be cleaned and dried by use of instrument cooling air to prevent
hot air from damaging the burner control elements.
When ordering spare parts, please provide the following information indicated on the burner
nameplate:
Burner model
Serial Number
Technical Parameters
Model Power KW Gas consumption Nm3/h

EP1GE 85-850 8-85
EP2GE 200-2000 20-200
EP3GE 300-3000 30-300
EP4GE 480-4800 48-480
EP5GE 680-6800 68-680
EP6GE 950-9500 95-950
EP7GE 1300-13000 130-1300
EP8GE 1700-17000 170-1700
EP9GE 2000-20000 200-2000
EP10GE 2450-24500 245-2450
EP11GE 2950-29500 295-2950
EP12GE 3500-35000 350-3500
3
Conversion standard:
Natural gas:
Calorific value ≈10kwh/Nm3
EBICO Intelligent Drive System is a burner control and safety system based on computer
micro-processing technology, and is applicable to any EBICO burner.
EBICO Intelligent Drive System uses electronic proportional adjustment instead of mechanical
fuel air conditioning control system. Fuel/air electronic proportional adjustment control optimizes
combustion efficiency and reduces fuel waste.
EBICO Intelligent Drive System uses dual processors and built-in bus to ensure the safety of
intelligent drive. In addition, the equipment itself will continue to test security. The system can be
used continuously if its own flame detector is installed.
1.3 Burner lifting IP66/IP67

AP
1 Burner ear
2 Sling or chain
Danger Danger! Lifting, please follow the relevant matters and specifications
4
1.4 Patent technology description
EBICO unique patented technology:

1. The specially designed combustion tube and flame diffusion disc ensure the full
combustion of fuel and reduce CO emissions.
2. Zoned air supply technology, through the zoned air supply, reduces the temperature of
the flame root and the partial pressure of oxygen to reduce the generation of NOx.
3. The graded gas supply technology adopted by the D-type gas nozzle: separate gas
supply from the center and separate gas supply from the gas ring.
4. Flue gas recirculation technology, when the combustion air temperature is very high,
only relying on the air partition and fuel partition is not enough to reduce the nitrogen
oxides generated in the combustion process, and the flue gas recirculation is used for
low oxygen combustion to reduce the production of NOx and CO. . This design reduces
the pollution to the environment and protects the human living environment; at the same
time it saves fuel costs.
The FGR function is used to reduce the Nox value in the flue gas. For the combustion
process, a certain proportion of flue gas is supplied to reduce the flame temperature,
thereby reducing the Nox value. By using FGR to introduce the circulating air volume
into the entire air inlet path, the maximum power of the low-nitrogen burner can be
limited. In other words, the maximum amount of combustion air that can be supplied is
reduced. Therefore, the fuel supply within the rated load range must be reduced in order
to obtain the correct combustion value, so the low nitrogen burner main engine (FGR),
blower and blast air duct must be added to meet the output of the normal boiler. The flue
is reserved on the flue between the economizer and the condenser of the inlet boiler.
The air duct space is designed from the flue on the flue to the air inlet of the blower. The
flue gas circulation valve is installed near the air inlet of the blower of the low nitrogen
burner.
！note The installation position requirements of the flue gas circulation valve: the valve
stem and the flue are installed horizontally or diagonally, and vertical installation is
strictly prohibited to prevent the condensed water from corroding the bottom of the
valve stem.
Circulating flue gas flue should be equipped with expansion joints, water collection devices,
and drainage devices (the bottom of the flue gas pipeline).
5
2. System diagram
The burner is installed on the flange of the boiler. Before installing the burner, check whether the
position of the flame stabilizer in the combustion head is correct. The burner is combined with the
fan for use.
1. Combustion tube 2. Cabinet 3. Body cover

4. Ignition gun connector 5. Ignition wire inlet 6. Lifting ear
8. Electromagnet 9. Gas nozzle
10. Flame stabilization disk 11. Control electric cabinet 12. Damper servo motor
13. Gas butterfly valve 14. Two-way gas butterfly valve 15. Linkage mechanism
The burner fan can be placed outdoors and connected to the burner air inlet through air duct,
which can reduce the noise emitted by the indoor burner.
！ The air inlet of the burner should be installed with flexible connection to eliminate
Note the impact of the vibration of the air duct on the burner.
！ The burner must be installed firmly, because any vibration can damage the burner
and its components.
Note
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3. Installation considerations
1. Power supply requirements:

The power supply is consistent with the power supply specified on the burner nameplate and in
this manual. A short-circuit and overload protection mechanism should be installed in the control
cabinet. If the voltage fluctuates greatly, a regulated power supply must be installed. An
anti-jamming device must be installed when the power supply has interference.
2. Wiring requirements:
The temperature sensor cable, servo motor control and feedback cable, and flame sensor cable
must be shielded cables and cannot be placed in frequency conversion cables or power cables. If
where the wire from the electronic control to the burner passes through a high temperature area, a
high temperature resistant wire must be used.
3. Natural gas requirements:
The natural gas pressure is 300-700 mbar. Please consult your local distributor for specific burner
pressure. Install a filter before entering the burner valve block.
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4. Pipeline system
4.1 Installation of gas valve block
The burner valve block is used as the gas supply unit of the burner. Whether it is installed
correctly will directly affect the safe use of the burner, and thus the following requirements shall be
noted when installing this valve block:
 Confirm the gas supply pressure and compare the maximum working pressure of the valve
block components to ensure that the gas supply pressure is not higher than the maximum
working pressure of the valve block components.
 Tighten the bolts on the connecting flange gradually at the opposite angles.
 Ensure that the gaskets between the flanges are clean and installed in place.
 The valve block components should be installed horizontally, and there are multiple supports
fixed to prevent vibration during work.
 It is recommended that the lowest position of the valve block installed is more than 200mm
above the ground.
4.2 Valve block diagram
EBICO burner is equipped with a pneumatic valve block and an automatic leak detection device,
and the valve block diagram is as follows.
The valve block is VGD40 ...
1. Filter 2. Expansion joint 3. Gas power switch

(low pressure)
4. Leak detection pressure switch 5. Combined solenoid valve V2 6. Three-way pipeline
(self-regulated)
7. Inlet elbow A: Natural gas inlet C: Center intake
D: Outer ring intake
Before installation, the dirt on the inner wall of the valve block and pipe fittings should be
removed.
In order to obtain better starting conditions, the distance between the burner and the gas valve
should be as short as possible.
Pay attention to the order and flow direction of the valve block (note the arrow).
The two-stage gas valve and pressure regulating valve should be installed vertically between
horizontally laid pipelines.
8
The valve block must have been supported on many places during installation. An expansion joint
must be arranged between the valve block caliber and the gas source pipeline.
In order to determine whether the gas already exists after the air is discharged, a test combustion
apparatus can be installed in front of the two-stage gas valve.
Tightness test of valve block

To check the air tightness of the valve block, the ball valve and two-stage gas valve must be
closed.
Test phase 1.
Connect the pressure gauge with rubber hose and hand pump with a tee between the two-stage
gas valve and the filter.
In this phase, the measuring point on the two-stage gas valve should be opened.
Test phase 2.
Connect the pressure gauge with hose and hand pump to the measuring point of the two-stage
gas valve.
The test pressure in the valve block should be twice the working pressure, but not lower than
100mbar and not higher than the maximum working pressure of the valve block.
In order to avoid temperature changes affecting the accuracy of the measurement, you should
wait about 5 minutes before starting timing.
If the pressure falls within 1 mbar within 5 minutes after starting timing, the valve block has good
air tightness.
In case of leakage found, it must be sealed by brushing with concentrated soap, and the test
process shall be repeated.
Functional flow inspection

The ball valve must be closed during this inspection.
1. Make sure that all components are electrically properly connected.
2. In order to carry out the leak detection process, it is necessary to pump air into the valve block
pipeline by hand pump to adapt the pressure to the future working pressure.
3. Turn on the power supply and the burner switch. At this time, the leak detection device starts
leak detection. Observe whether the process of opening and closing V1 and V2 in the two-stage
gas valve is correct (the indicator light on the two-stage gas valve indicates on-off situation).
4. After about 60 seconds, the leak detection ends and the burner fan starts.
5. The servo motor opens the damper, and the entire pre-purging time is about 30 seconds.
6. The servo motor closes the damper to the ignition position, the ignition electrode ignites, and
the two-stage gas valve is open.
7. Due to the pressure drop in the valve block pipeline, the gas pressure switch shuts down the
burner and the two-stage gas valve is closed. Check whether the burner is working according to
the above process and whether the gas pressure switch can operate correctly; if there is a fault
during operation, refer to the function flow of the program controller and other further instructions.
Discharge air
Before starting the burner for commissioning, the air in the valve block must be discharged.
Connect a hose onto the test port of the two-stage gas valve that leads air to the outdoor.
Open the ball valve, and the gas in the valve block pipeline flows to the outdoor safe place via the
air exhaust hose.
After discharging the air, reconnect the pressure gauge to the test point on the two-stage gas
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valve.
If a test device is installed in the device, it can be used to test whether the air has been completely
removed from the pipeline.
The air must be discharged completely.
4.3 Description of valve block components
VGD40. ···two-stage gas valve and SKP25 gas pressure regulator

The safety cut-off on/off feature complies with EN 161 standards and it is used in conjunction with
Siemens gas valves and air quick cut-off valves.
 Open slowly
 Closed quickly
 Low power consumption
When being powered on, the pump is started and the control valve is closed. The pump sends oil
from the container below the piston to the pressure chamber above the piston. The piston moves
downwards under the action of oil pressure and the valve against the pressure of the closing
spring is opened. The pump stays on until it receives a shutdown instruction. When the power
supply is cut off or fails, the pump is turned off and the control valve is opened, so that the closing
spring pushes the piston back. The size of the reflux system ensures that the stroke to return to
the fully closed position is completed within 0.6s.
The actuator and valve are used together, suitable for I ... III gas and air. They are mainly used in
gas burning devices. The actuator is opened slowly, but it is closed quickly. They can be used in
combination with any of the above types and sizes of valves.
SKP25 ... with a setting spring can be used as a constant pressure regulator.
4.3.1 Pressure switch

After the burner blower starts, the pressure of the combustion air in the burner
bellows.
Dismantle the transparent plastic cover from the pressure switch. Set the
pressure switch via the ring screw VR to 50% of the measured value.
After adjusting, reinstall the plastic cover.
4.3.2 Gas filter

The gas filter is a device used to remove dust carried by the gas. It can prevent the components of
the equipment (such as burners, calculators and regulators) from being clogged quickly. This filter
is generally installed on the upper reaches of all control equipment and switching equipment.
Maintenance of gas filter
After ensuring that there is no compressed gas in the filter, loosen the fixing screw 8 and take off
the cover 1. Dismantle the sleeve 3 of the filter, wash it with soapy water and clean water, and dry
it with compressed air (if necessary, replace it), before reinstalling it onto its original position.
Check whether the position of the sleeve and that of the bottom positioning plate 6 are correct,
ensure that it will not lock the cover 1, and return the cover to its original position. Finally, put on
the cover 1 again to ensure that the O-ring 2 can be stuck on the base, and the sleeve is smoothly
located between the positioning plate 6 and the cover 1, like the bottom 5.
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1. Cover 2. O-ring 3. Filter sleeve 4. Screw M5 × 12
5. Bottom positioning plate 6. Support frame 7. Housing 8. Screw M5 × 14
4.3.3 PLC automatic leak detection system (with pressure switch)

Leak detection device is specifically designed for safety shut-off valves, which are used in gas
burners and other gas applications. In the event of gas leakage, the system can prevent the
burner from starting. When used in conjunction with 2 pressure switches, the valve leak detection
system will automatically start when the burner is started.
The valve leak test is based on the level-2 pressure verification test principle:
1. The first stage of testing: first the V2 valve is powered on and opened for 5 seconds, before it is
closed,
Reduce the gas pressure between V1 valve and V2 valve to atmospheric pressure. Within 22
seconds, apply the leak detection switch to detect whether the pressure inside rises. If there is no
pressure, V1 valve leaks and the burner can not be started. If it is detected that V1 valve is not
leaking, enter the second stage.
2. The second stage of testing: Then the V1 valve is powered on and opened for 5 seconds, and
then it is closed, so that the pressure between V1 valve and V2 valve is equal to the gas source
pressure of natural gas; the pressure of the natural gas inside is detected through the leak
detection switch, and if there is no pressure, V2 valve is leaking and the burner cannot be started!
If the pressure does not decrease, V2 valve does not leak, and the second stage passes. If both
the first and second stages pass, the start-up procedure of the burner enters the next stage of
purging.
11
The automatic leak detection system is a very important burner protection system.
In case of internal leak, it is very dangerous for gas to enter the furnace.
It is strictly forbidden to use the burner by short circuit or removing the leak
Danger detection system.
12
5. Proportional adjustment setting/Burner
5.1 EP… GE burner

EBICO EP… GE burner is an industrial electronic proportional adjustment gas burner. Its
operation, start and stop are fully automatic. The automatic function of the burner is realized in the
automatic system.
The main components of the burner:

1. Bellows
2. Nozzle
3. Ignition gun
4. Adjusting device for damper and gas butterfly valve
5. Flame detector
6. Combustion air controller
7. Observation hole
5.1.1 Bellows
The burner bellows are made of welded steel plates. Combustion air is introduced into the
octagonal frame, and the airflow enters the furnace through an adjustable blade. The position of
the blade has an impact on the rotation of the air passing through the burner. The blade causes air
to move in a tangential rotational manner before entering the furnace. The position of the blade
can be adjusted by a lever mounted on the front plate of the burner. The blade adjustment is
completed during the trial operation.
The blade position has an influence on the following factors:
 Vortex of combustion air and flame shape
 Mixture of combustion air and gas
Note! The position of the regulating blade has been set during the trial operation, and its position
cannot be changed.
The air volume is adjusted by the air control panel at the front of the bellows.
Combustion air enters from the inside of the burner, where there are four dampers controlled by
the motor to regulate the air flow.
5.1.2 Servo motor

Perform the motor adjustment
Before starting the burner, check the adjustment of the air piece and gas valve actuating
motor. Regarding this adjustment, please proceed as follows:
Check whether the switch of the air piece is properly adjusted to avoid hitting the air
piece into the air intake box. In order to adjust the limit switch, it is suggested to feed air
to the actuator from the outside instead of from the control system.
Check the gas valve actuator switch to rotate it up to 90º.
13
Check whether the rotating direction of the actuator is correct (when the control system issues an
opening command, the actuator starts to turn on gas and air intake). If it does not happen, replace
the opening & closing actuator wires. When the actuator runs to the maximum opening position,
the feedback signal value rises; if it does not happen, the external signal wire is replaced.
If an actuator is replaced, the

maximum and minimum
potentiometer positions must be
kept at the same value; otherwise
the burner must be adjusted again.
The damper flaps are held on each

side by bearings and special supports. These bearings can swing to adjust the flaps properly.
5.1.3 Nozzle
NOx emissions are reduced by positioning the gas gun to the outside, but CO increases and the
flame length is shortened, so that the flame becomes more stable (the boiler may be vibrated).
Positioning the gas gun inwards reduces CO emissions and stabilizes the flame, but NOx
emissions increase and the flame becomes longer.
5.1.4 Ignition gun

Parameters:
Flame size: Máx. 500 mm
Natural gas connection: 3/4”
Natural gas supply pressure: 60-150 mbar
Combustion air supply pressure: 10mbar (minimum).
Natural gas flow: 25 Nm3/h
Power supply: 230 Vac, 50/60 Hz
Ignition transformer: 1 x 8 kV, 20mA
Flame relay: sensitivity> 1 mA
The ignition gun is a gas igniter. The junction box and ignition transformer are installed at the rear
end. The combustion chamber is a place where gas and air are mixed. The ignition gun’s flame is
ignited in the gas nozzle at the front end of the ignition gun. See the chapter Maintenance for
details.
The main parts of the ignition gun

 Intake pipe
 Ignition transformer
 Connecting cables
 Gas nozzle
 Ignition electrode
When the premix of combustion gas and air is ignited by the ignition electrode in the gas nozzle,
combustion occurs.
14
The ignition voltage is 8000V, and the ignition device must be reliably grounded.
Danger
The required amount of liquefied gas and combustion air from the supply pipeline enter the
ignition gun through the valve device.
5.1.5 Ignition gas solenoid valve

Two Gas solenoid valves are installed to control the gas supply into the igniter.
These valves normally close, and when they open, the gas flows into the
igniter. Two solenoid valves are energized at the same time. Install 2 solenoid
valves to ensure ignition circuit is closed when required. The valve is Brahama
E6g.
5.1.6 Observation hole
Observe the flame through the observation hole. If there is dust on it, it must be dismantled and
cleaned.
5.1.7 Regulating device for damper and gas butterfly valve

The adjustment of gas and combustion air is determined by two servo motors respectively, which
adjust the size of the damper and the intake butterfly valve according to the ratio of air and gas;
the amount of air and fuel can be changed as long as the size of the servo motor is changed. The
servo motor receives 4-20mA control signals. It has changed the disadvantages of traditional
burners in which the burner is adjusted through mechanical connecting rod, such as difficult
adjustment, poor accuracy and large error. According to the preset air-to-gas ratio curve or the
curve during commissioning, the size of the damper and that of the intake butterfly valve are
adjusted synchronously.
5.1.8 Flame detection device

The main flame of the burner is monitored by the main flame
detector. The connecting pipe of the flame detector is installed on
the burner, and it has a cooling air joint. Cool air keeps the flame
detector clean and prevents overheating.
The flame scanner for flame detectors is a UV sensor, type QRA10.

APPLICATIONS: LIQUID AND GAS FUEL PROTECTION: IP 54
operating temperature:-20 °C... + 60 °C weight: 740G
5.2 Gas regulator
The high-precision regulating valve has a spherical shape inside the valve seat, with the features
such as high strength, a large valve flow area, small flow resistance, and almost no friction with
the valve plate when it is closed and started, to ensure its long-term service.
15
1.Standard 2.EBICO
1. Indicator
2. Shaft guide block
3. Body
4. Valve
5. Shaft
6. Scale nameplate
7. O-ring 15.30 × 2.40 2PCS
8. O-ring 34.00 × 3.00
9. Sliding bearing
10. Sliding bearing
11. Hexagon screw
12. Hexagon screw
13. Hexagon screw
14. Spring washer
15. Spring
16
6. Operation guide
6.1 Preparations for the first start/pre-start
6.1.1. Burner
Perform the following inspections and adjustments before starting for the first time:
- After installation, the pipeline is cleaned with compressed air.
- The rotating direction of the fan.
- The burner and valve device are in working conditions (installation, connection, etc.).
- The electrical connectors, valves and control devices of the burner have been tested and are
in working conditions.
- Emergency stop circuit is ready.
- The boiler interlock circuit is ready.
- The set value of the pressure switch follows the guide value.
- The working value follows the data given in the P--I chart.
6.1.2 Start the burner and check the following:

- Check the pipeline and equipment after installation.
- Check whether the gas supply line is open before starting. Open the manual ball valve slowly
and observe whether the pressure gauge is in the normal range?
Gas Pressure Range 35-45 Ka, normal steering at 40kpa
Steering of Fan.
People in the fan inlet observation: is clockwise
Control Cabinet touch screen data display normal-equipment,
control room electrical connection has been tested, and in working condition.
- Piping Safety Equipment has been tested and is in working condition.
- The working value follows the PI-chart given data.
6.2 Normal operation
Within the operating range required for the boiler load, the operation control of the burner is from
the control cabinet PLC cabinet.
The operator monitors the operation process, checks the alarm, and takes measures to eliminate:
- Inspection process show:
* Process parameters
6.2.1 Fan frequency

Fan frequency range 27HZ-50HZ
The wind pressure is 2-5kPa, and it is affected by the frequency of the frequency converter. If the
frequency is lower than 27HZ, it will cause insufficient air supply to the burner. The frequency of
the fan can be seen from two places; one is from the boiler control cabinet, and the other is from
the burner's own control cabinet touch screen.
Fan frequency range 27HZ-50HZ, lower than 27HZ; please stop, and check the
frequency converter
Danger
17
6.2.2 Gas valve setting and position
The normal range of the intake flow regulating valve is 11-39. This range can be modified in the
parameter settings.
6.2.3 Damper setting and position
The normal range of the intake air flow regulating valve is 28-65. This range can be modified in
the parameter air-fuel table.
* Equipment in operation
* Final result and equipment lock, reason, etc.
During normal operation, the operator should regularly check the following:
- -Whether the noise in the device is normal.
- The sound of the fan is normal, with no vibration and the bearing temperature is not too high.
- The air control board and its actuator are in the working condition.
- Read the pressure gauge and compare the reading with the display value of the control room
if necessary.
- General condition of the burner, readiness for operation (leakage, fire safety), flame profile,
and cleanliness of the flame holding plate.
- Cable (no risk of damage).
- The pipeline and other equipment are in good working condition.
When performing work on any part of the equipment, the control room must be notified.
However, any work must not be implemented to cause harm to personnel or equipment.
6.3 Start
6.3.1 Gas pipeline

Before starting, check whether the gas supply line is open. Slowly open the manual stop valve,
and observe whether the pressure gauge shows in the normal range?
Gas pressure range 35-45Ka, normally 40kPa
6.3.2 Burner
Before starting the burner, press down to observe whether there is a failure. The start signal is
given by the boiler control system, and the burner control screen is not equipped with a start
button to prevent misuse.
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6.4 Ignition test
The ignition ball valve is opened, the ignition pipeline is under pressure, the fan is turned on
manually, and the ignition test begins when it is pressed down again to test whether the ignition
flame is normal.
6.5 Stop and emergency stop
6.5.1 Stop
Before the burner is stopped, it should always be controlled to the minimum load to prevent
excessive temperature fluctuations in the furnace. The stop signal is given by the boiler control
system, and the burner control screen is not equipped with a stop button to prevent misoperation.
6.5.2 Emergency stop

Emergency stop is implemented by the control cabinet. Press down the emergency stop button,
and the burner is immediately shut down.
In the case of an emergency stop, it is allowed to restart the burner, but after finding the cause of
the stop and after it is safely started again.
19
7. Working procedure diagram of gas burner
Working
conditions met
The burner stops Failure

Start power starting
programming
Power on the system Failure
Valve leak detection

Leak detection not
Leak detection accepted
accepted
Start the fan
Fan pressure is too low

Detect fan pressure
The damper is opened to the
Too high gas
maximum, the purging
pressure
Fan pressure is process lasts more than 36
seconds, and then the Normal gas pressure
normal, purge ( running time)
damper is closed down to the Too low gas
ignition state pressure
End of purging
Damper alignment
End of ignition phase
Too low fan

pressure
Electric eye detection Normal fan pressure
(whole running time)
Electric eyes detect Electric eyes detect fire in
that there should be furnace
no fire in the furnace The burner enters
normal operation
Ignition electrode
generates arc
Normal shutdown
V1 valve and ignition

solenoid valve turn on the
ignition tube for ignition Post-purging
Ignition failure
Ignition success
Shutdown
Electric eye detection
(whole running time)
Electric eyes detect Electric eyes detect no
there should be no fire in furnace
fire in the furnace
V2 valve is open and
the burner ignites
successfully
In order to accurately set the load of the heating device, the corresponding gas flow must be
calculated in advance.
20
Example:
Boiler power: 2000KW
Boiler efficiency: 88%
Calorific value of combustion (natural gas) H u, n = 10 kWh/m³
Required heating power (burner output) =
2000/0.88 = 2273kW
Gas flow rate in standard state:
Vn = 2273/10 = 227.3m³/h
Because the amount of gas will vary with changes in pressure and temperature, it should be
converted according to the state of the equipment in the actual operating environment.
Standard state: 0°C, 1013 mbar
The actual operating conditions of the equipment in the above example:
mbar
Po = atmospheric pressure 960
PG = gas pressure * 500
Absolute pressure 1460
tG = gas temperature 15°C
* Gas pressure and temperature can be read from the flowmeter.
Po+PG 273
The formula for calculating the correction factor F is: F = 1013 * 273+tG
Then: 960 + 500 = 1460 mbar and F = 1.366 at a temperature tG 15°C
So the actual gas flow required: Vb = Vn/f = 227.3/1.366 = 166.4 m³/h
Because the moisture content in the gas is very low, it has been ignored in the formula.
Altitude correction table

Altitude Atmospheric Temperature Oxygen content in Calculated
(m) pressure (pa) (k) air (Kg/m³) correction value f
0 101325 288 0.2917 1
200 99043 286.7 0.2852 0.977
400 96744 285.5 0.2786 0.955
600 94453 284.2 0.2721 0.93
800 92163 282.9 0.2655 0.91
1000 89872 281.7 0.259 0.887
2000 79501 275.2 0.2343 0.78
3000 70121 268.4 0.2118 0.688
4000 61660 262.2 0.1909 0.6
21
8. Troubleshooting of Burner
8.1 If a failure occurs, the basic requirements for correct operation should be
checked first
1. Whether the air pressure in the air supply line is normal and whether the ball valve has been
opened;
2. Whether all the regulators such as the safety device limit switch when the temperature switch of
the boiler is short of water are set correctly;
3. Whether the amount of fuel and the corresponding air distribution have changed.
If it is determined that the failure is not caused by an external cause, the operation function of
each component of the burner must be checked.
8.2 Special problems
Failure on the touch

Possible cause Measure
screen
The fire detection is During the start-up and purging Stop the burning process and
abnormal; please of the burner, an open flame check whether there is fire in the
check whether there appears in the boiler boiler observation hole,
1
is open flame in the
flame detector and The flame detector fails Replace the flame detector
the boiler furnace
The boiler is
interlocked and shut
Boiler interlocking shows a red
2 down; please check Check the boiler control system
light on the touch screen
the boiler interlock
signal!
The ignition transformer does
The ignition with Check ignition transformer
not produce sparks
ignition gun fails;
Is the ignition solenoid valve
please check the Check ignition solenoid valve
3 open?
ignition gun, gas
The ignition electrode position Adjust the ignition electrode
pressure and fire
is wrong position (2-4mm)
detection!
Gas pressure is wrong Re-adjust
The main flame fails; Are the 2 main gas valves
Check the main gas valve
please check the gas open?
4
valve block, gas and Small opening of gas volume
Increase the opening
fire detection! regulating valve
Re-ignite after the steam
The steam pressure High steam pressure
pressure drops
is too high and the
The steam pressure transmitter
furnace stops; please Replace
5 is damaged
check whether the
The connection between the
analog signal is
steam pressure transmitter and Connect the wire or replace
normal!
the PLC is loose or broken
Combustion air Check the air pressure switch,
Re-adjust or replace
pressure is low; and the set value is 20mbar
6 please check the fan
Check the fan frequency
and air pressure Re-adjust or replace
converter
switch!
The gas pressure is Check the low gas pressure
low; please check the switch, and the setting is 100 Re-adjust or replace
7
gas pressure and mbar
pressure switch! Check intake pressure Re-adjust
The gas pressure is Check the high gas pressure
8 high; please check switch, and the set value is 300 Re-adjust or replace
the gas pressure and mbar; here is the flow pressure
22
screen
pressure switch! at the nozzle
Check intake pressure Re-adjust
The rear main solenoid valve is
The front and rear valve of the
not opened and released
The front gas valve main solenoid valve are opened
The front solenoid valve leaks
leaks; please check for several times separately, but
The leak detection switch is set
the front valve and there may be impurities on the
9 incorrectly
the leak detection valve plates; if maintenance is
Leak detection switch 1 50
switch! inaccessible, replace them
mbar
Re-adjust or repair, replace the
Leak detection switch 2 200
leak detection switch
mbar
The front valve of the main
main solenoid valve are opened
solenoid valve is not opened
The rear gas valve for several times separately, but
for inflation
leaks; please check there may be impurities on the
10 The front and rear valve of the
the rear valve and valve plates; if maintenance is
main solenoid valve leak
leak detection switch! inaccessible, replace them
Leak detection switch is the
same as above
leak detection switch
The natural gas main main solenoid valve are opened
gas valve 1 is not Check whether the valve body for several times separately, but
closed properly; is in place and that the there may be impurities on the
11
please check the verification switch is not in valve plates; if maintenance is
verification switch and place inaccessible, replace them
valve body! Re-adjust or repair, replace the
verification switch
Natural gas main gas main solenoid valve are opened
valve 2 is not closed Check whether the valve body for several times separately, but
properly; please is in place and that the there may be impurities on the
12
check the verification verification switch is not in valve plates; if maintenance is
switch and valve place inaccessible, replace them
body! Re-adjust or repair, replace the
verification switch
The exhaust valve is opened for
The natural gas
several times, but there may be
exhaust valve is not Check whether the valve body
impurities on the valve plate; if
closed properly; is in place and that the
13 maintenance is inaccessible,
please check the verification switch is not in
replace them
verification switch and place
valve body!
verification switch
Check the blower frequency Re-adjust
Low oxygen alarm!
Burner damper Re-adjust
Please check the
14 Burner intake flow valve Re-adjust
oxygen controller or
probe! Oxygen content controller or
Repair or replace
probe is damaged
Low oxygen alarm Check the blower frequency Re-adjust
and stop the furnace! Burner damper Re-adjust
15 Please check the Burner intake flow valve Re-adjust
oxygen controller or Oxygen content controller or
probe! Repair or replace
probe is damaged
If the damper Check whether the given and
regulating actuator is The given and feedback value feedback current are the same;
16 abnormal, please of the burner damper is more if so, the PLC module fails; if not
check the damper than 4% so, the damper actuator fails,
actuator and line! and repair and replace it
17 If the natural gas The given and feedback value Check whether the given and
23
screen
regulating actuator is of the natural gas regulating feedback current are the same;
abnormal, please actuator is more than 4% if so, the PLC module fails; if not
check the damper so, the damper actuator fails,
actuator and line! and repair and replace it
When the frequency
Check whether the given and
feedback of the The given and feedback
feedback current are the same;
frequency converter frequency of the frequency
18 if so, the PLC module fails; if not
is abnormal, please converter is more than 4%
so, the damper actuator fails,
check the frequency
and repair and replace it
converter and line!
In case of fan failure,
please check the fan Check the fan frequency
19 Repair and replace
frequency converter converter and line
and line!
When the steam
pressure signal is
20 Steam pressure signal broken Please check the line
broken, please check
the line!
8.3 Reset and restart
After troubleshooting, click the reset button on the lower right corner of the touch screen in the
burner electric cabinet, and then start with the boiler control system
8.4 Ignition gun
Failure Possible reason Measure

The ignition gun is damaged Check the function and cleanliness of the
Combustion gas or combustion ignition gun.
It cannot be established air supply
due to arc flame The installation position of the Check the installation position.
ignition gun is too deep Gas pressure
No ignition spark Check electrical equipment
Ignition transformer failure Check the ignition transformer and
No voltage replace it if it is damaged.
No ignition spark
There is carbon formation on Check electrical connections.
the electrode Take out and clean
24
9. Burner fan
When connecting the fan and the burner, install the fan before connecting the air duct. The upper
part of the air duct should be equipped with a compensator to ensure that there is no acting force
on the housing. The air duct is provided by user on the site. Before entering the burner, a straight
pipe with a length of about 1 meter should be provided. If there is a reducing pipe or expansion
joint in the air duct, the opening angle should not exceed 15°, and the air duct steel plate should
be more than 4 mm; the air speed does not exceed 15m/s, and the inner diameter of the air duct
should be larger than the inlet size of the burner.
Before starting the fan for the first time, you must check whether there are impurities, water, etc. in
the fan shell, turn the fan shaft by hand to see whether it rotates flexibly, and then turn on the
power supply to check whether the direction of the fan rotation is consistent with that on the fan
label. The damper should be closed when starting the fan for the first time. The full load curve of
the motor needs to be inspected
Where the fan is installed on the foundation, the levelness must be strictly adjusted with air level,
and the base frame must be stable. If the fan is driven by a belt, the belt should be checked after
10 to 12 hours of operation. If it is loose, the belt should be tightened again to meet the
requirements.
25
10. Routine maintenance
Overview
！ The main control room must be notified before maintenance work begins. Maintenance
can only be carried out by professionals. Follow local laws and regulations
Note
 Maintain the burner every year

 Please use original parts. When ordering parts, please provide the model and body number
shown on the burner nameplate
 When you need repair service, please contact sales agent companies of EBICO.
Maintenance
Problem Problem
Measures
Replace
With gap Suggestion: once
every 2 or 3 years
Rolling bearing on the damper shaft
Replace
Damaged Suggestion: once
every 2 or 3 years
Ignition cable and ion probe cable
Clean
Dirty
Suggestion: once
every year
Flame tube/flame stabilizing plate

Clean or replace
Suggestion: once a
month after the first
Dirty
use, and once a
year for the second
year
Gas filter element
Clean or replace
Suggestion: once a
Dirty month after the first
use, and once a
year for the second
year
Flame detection
26
In order to ensure the normal operation of the burner, it is recommended to carry out the following
work at least every year
1 Check the flame holding plate and replace it if necessary. Check the settings of the
combustion head if there is much carbon in the flame holding plate.
2 Clean and check the position of the ignition electrode, and replace it if necessary.
3 Clean and check the flame sensor, and replace it if necessary.
4 Regularly clean and check the gas nozzle, and replace it if necessary.
5 Check the connection part of the servo motor.
6 Check the leakage of the gas pipeline.
7 Clean the filter.
8 Check the combustion situation through regular exhaust gas detection or boiler cleaning.
11. Safety guidance

1 The ignition and operation of the burner should be performed by the strictly trained operators.
2 Because hot air is used in the burner, it is strictly prohibited to touch the burner directly with
your hands.
3 Unauthorized safety problems may never be carried out. Our company will not be responsible
for unauthorized modification.
4 It is strictly forbidden to conduct electric welding and gas cutting operations near natural gas
pipelines, and do not put cigarettes, matches, lighters and other fire sources near the fuel,
which may cause ignition.
5 If there is gas leakage, do not ignite or start live equipment, close the main gas valve, make
sure the leakage area is well ventilated, and contact the operation management personnel.
6 If the burner fails to be ignited for one time, notify the maintenance personnel to find out the
cause and then ignite it again. It is strictly forbidden to ignite it repeatedly.
27
7 643
On / off On / off On / off On / off

with constant pressure with differential pressure with pressure ratio
governor governor controller
SKP15... SKP25... SKP55... SKP75...
Actuators for SKPx5...

Gas Valves
• ON / OFF safety shutoff feature conforming to EN 161 in connection with gas
and air valves from Siemens
• Damped opening (rapid closing)
• Very low power consumption
• Suitable for gases of gas families I...III
• Optionally with / without end switch (factory set)
• Plug-in connection facility
• Electrical indication of operation
• Stroke indication
• Supplementary Data Sheets (refer to Data Sheets on gas and air valves)
The SKPx5... and this Data Sheet are intended for use by OEMs which integrate
the actuators in their products.
CC1N7643en
Siemens Building Technologies
11.01.2005 HVAC Products
Use
The SKP... are designed for use with the following types of valves:
Type of valve Medium Data Sheet
VGG... Natural gas N7636
VGF... Gases of gas families I...III
VGH...
VGD2... Natural gas N7631
VGD4... Gases of gas families I...III
VRF... Biogas N7633
VRH... (used with SKPx5..., on
request)
VLF... Hot air N7637
SKP... in general The combination of actuator and valve provides the following functions:
- Safety shutoff valve (SKP15...)
- Safety shutoff valve with gas pressure governor / controller (SKP25..., SKP55...,
and SKP75...)
The electrohydraulic SKP... actuators together with the valves are designed for use with
gases of gas families I...III and air. They are used primarily on gas-fired combustion
plant. The actuators open slowly and close rapidly. They can be combined with any of
the above mentioned valve types and nominal sizes. The actuator can be supplied with
end switch (for indicating the fully closed position).
For information about valve sizing, refer to the «Valve sizing chart» in the Data Sheet of
the relevant valve.
SKP25... The SKP25... operates as a constant pressure governor with a setpoint spring.
Its field of use are primarily forced draft gas burners

- with mechanical fuel / air ratio control
- with electronic fuel / air ratio control
SKP55... The SKP55... operates as a differential pressure governor.
Its field of use are primarily

- combustion plant with combined heat recovery systems
- plant where pressure conditions in the burner and in the combustion chamber do
not change in proportion to load changes
- burners with adjustable fuel / air mixing devices in the burner head
- plant with negative pressure levels on the gas or air side
SKP75... The SKP75... operates as a ratio controller and provides control of the gas pressure
depending on the pressure of the combustion air, ensuring that the gas / air ratio re-
mains constant across the entire load range.
Its field of use are primarily modulating forced draft gas burners.
2/25
Siemens Building Technologies CC1N7643en

HVAC Products 11.01.2005
Warning notes
To prevent injury to persons, damage to property or the environment, the follow-
ing warning notes should be observed!
Do not open, interfere with or modify the actuators!
• All activities (mounting, installation and service work, etc.) must be performed by
qualified staff
• Check to ensure that the impulse pipes are properly fitted and tight
• Fall or shock can adversely affect the safety functions. Such actuators must not be
put into operation, even if they do not exhibit any damage
• If mains voltage is fed to the end switch via the second plug-in space, protective
earth must be connected to the actuator via the same plug
• Use of connectors conforming to DIN EN 175301-803-A is mandatory
• The connectors used must have cable strain relief
• The pump’s stem must not be pulled
out using the overstroke element
since that part could become loose
7643z17e/0404
Do not pull here!
SKP15... / SKP25... SKP15... SKP25...

with connecting cable
AGA62.000A000
Position Position
valve1 valve 2
7643z28e/1203
VGD40...
Plug-in space without collar

(end switch / CPI)
AGA64 AGA65
For connection of end switch,

a connector with collar should be used
(protection against electric shock hazard),
refer to "Accessories"!
Plug-in space with collar

(power supply) 7643z14e/0105
3/25

Engineering notes
Design of the If the available gas pressure exceeds the maximum permissible operating pressure of
gas train the valve / SKP... (refer to the Data Sheet of the relevant valve), it must be lowered by
an upstream pressure controller. The pressure switch for lack of gas must always be
fitted upstream of the gas valve when used in connection with the SKP… The inside
diameter of the impulse pipes must be a minimum of 6 mm.
SKP25..., SKP55..., The impulse pipes must be installed such that the differential pressure can be acquired
SKP75... with no disturbance (unfavorable flow conditions). Pressure test points must not pro-
trude and be flush with the inside diameter of the pipe or duct wall. The impulse lines to
the governor / controller should be as short as possible, enabling the governor / control-
ler to respond quickly should sudden load changes occur.
SKP75... • Installation of impulse pipes

In the case of unsafe combustion chamber pressure pipes (e.g. resulting from po-
tential leaks), the setting must also be checked during operation without having the
combustion chamber pipe connected, especially with respect to maximum burner
capacity. The impulse pipes must be fitted such that the differential pressure can
be acquired with no disturbance. With gas / air ratios > 3, the impulse pipes for the
combustion air and the combustion chamber pressure must have an inside diame-
ter of at least 8 mm. The impulse pipe for the combustion chamber pressure must
be fitted such that the gases will cool down in the vicinity of the impulse pipe and
condensing gases cannot enter the controller but will return to the combustion
chamber.
Recommendations:
– The gas pressure should be acquired at a distance of 5 times the nominal pipe
size downstream from the valve
– Do not use the lateral test points on the VG... valve body for picking up the pres-
sure
• Considering the combustion chamber pressure

If the resistance value of the combustion chamber / heat exchanger / stack system
is constant, the combustion chamber pressure changes in proportion to the gas
and combustion air pressure as the burner’s output changes. In that case, the
combustion chamber pressure need not be fed to the SKP75... as a disturbance
variable. However, if the combustion chamber pressure does not change to the
same extent as the gas and air pressure – as this is the case in plants with flue gas
fan or modulating flue gas damper – the combustion chamber pressure must be
fed to the SKP75... as a disturbance variable, enabling the controller to counteract.
Mounting notes
• Ensure that the relevant national safety regulations are complied with
• The quadratic arrangement of the fixing holes allows the actuator to be fitted in 4
different positions, each step being 90°
• The actuator can be mounted or replaced while the system is under pressure; seal-
ing materials are not required
• Follow the Mounting Instructions included with the actuators:
- For SKP15...: M7643
- For SKP25...: M7643.1
- For SKP55...: M7643.2
- For SKP75...: M7643.3
4/25

Installation and commissioning notes
SKP... in general • Electrical commissioning may only be performed when the SKP… is fitted to the
valve; otherwise, the SKP… can be damaged
• Power is supplied and connection of the end switch is made directly via a connect-
ing cable (conforming to DIN EN 175301-803-A)
• The end switch is factory set
Functioning principle When power is applied, the pump will be activated and the control valve closed. Oil is
of 1-stage actuator with now pumped from the chamber below the piston to the pressure chamber above the
safety shutoff feature piston. The oil pressure causes the piston to move downward, thereby opening the
valve – against the pressure of the closing spring. The pump remains energized until
the closing command is given. When power is removed, or in the event of a power
failure, the pump will be deactivated and the control valve opened so that the closing
spring pushes the piston back. The return flow system is sized such that the counter-
stroke required for reaching the fully closed position is completed within about 0.6 sec-
onds.
SKP15... complete (Schematic drawing)

with valve
4 Legend
1 Piston
1 2 Oscillating pump
SKP15...
3 Oil reservoir
2
4 Pressure chamber
7 5 Stem
6 Closing spring
7 Control valve
8 End switch (optional)
3
5
8
7643z29/0304
VG.../VL.../VR...
pE
5/25

Installation and commissioning notes (cont´d)
SKP2..., SKP5... and SKP7... control a bypass valve via their pneumatic controller,
thereby opening the VG… gas valve.
with valve
D am ping A G A 25 Legend
(optional)
P G as 4 1 Piston
Air
O nly S K P 25.3...: 2 Oscillating pump
A ir connection P L 3 Oil reservoir
1 4 Pressure chamber
5 Stem
10 6 Valve´s closing spring
7 Control valve
9 8 End switch (optional)
2
9 Spring (setpoint adjust-
S K P 25.... 7 ment)
10 Ball valve
3
8
> 6 mm
V G .../V L.../V R ...
m in. 5d
pE
7643z30e/1204
SKP25... The setpoint adjustment «PGas» must be made manually by turning the adjusting screw
that acts on the setpoint spring (for setpoint springs, refer to «Accessories»).
PGas Legend
Pe Inlet pressure
V Volumetric flow
PGas 0...22 mbar (with mounted
standard spring)
t (Pe; V)
7643d03/0503
SKP25.3... The SKP25.3... operates based on the zero governor principle (PL : PG = 1:1).
By feeding fan pressure «PL» to the air inlet, gas pressure «PGas» follows with a fixed
1-to-1 ratio.
PGas A Gas / air ratio for stoichiometric
C
combustion
A B At low-fire, the parallel displace-
ment of the working characteri-
B stic produces a larger amount of
excess air in percent. The zero
governor permits a parallel dis-
PGas +
- 1 mbar
placement in both directions,
towards «Excess air» B and
«Lack of air» C
PAir
7643d04e/0105
6/25

SKP25.4... The SKP25.4... is suited for the control of higher pressures.

Standard spring 0...1,500 mbar.
SKP25.4... complete (Schematic drawing)

with valve
4 Legend
Luft / Air PGas
1 Piston
3 Oil reservoir
4 Pressure side
10 5 Stem
6 Valve´s closing spring
9
2 7 Control valve
SKP25.4....
9 Spring (setpoint adjustment)
10 Ball valve
3
8
> 6 mm
VG.../VL.../VR...
min. 5d
pE
7643z34/1204
SKP25.4... Setpoint adjustment «PGas» is made manually by turning the adjusting screw which
acts on the setpoint spring (for setpoint springs, also refer to «Accessories»).
PGas Legend
Pe Inlet pressure
V Volumetric flow
PGas 0...1,500 mbar
t (Pe; V) (with built-in standard spring)
7643d09/1204
7/25


with valve
Legend
PGas
Luft / Air
1 Piston
3 Oil reservoir
1 4 Pressure chamber
5 Stem
9 6 Valve´s closing spring
2 7 Control valve
7
9 Spring (setpoint adjustment)
10 Ball valve (bypass)
SKP55... 3
8 5
> 6 mm
VG.../VL.../VR...
min. 5d
pE
6
7643z32/0304
VG / PG Example:
Adjusted gas / air ratio for burner operation
1+ with excess gas 1+ . The percentage of
excess air is constant across the entire
load range. Gas / air ratio adjustment with
the adjustable orifice on the gas side (see
position k).
9
1-
7643d01/1004
VL / PL
Legend VL Volumetric air flow

VG Volumetric gas flow
8/25

M pL A
Air
8
VL 11
SKP55.../V... 3 - +2
1 +
B B
7643z01e/1204
5+ - 4
Gas 7
10 VG
pG
9
Safety notes:
Air damper j / orifice 11 must always be located as shown, that is, orifice
11 must be installed downstream from the air damper j.
Gas valve 10 (VG...) / orifice k must always be located as shown, that is,
orifice k must be installed downstream from the gas valve 10 .
4 3 5 c Adjustment of parallel displace-
ment of working characteristic
7643z12/1204
* Check combustion values

with cap fitted
2
d Test point for air pressure (+)
e Test point for air pressure (-)

1
f Test point for gas pressure (-)
g Test point for gas pressure (+)
12 h Stroke indication
i Spring (parallel displacement)
6
j Actuating device (air)
k Orifice (gas)
10 10 VG... gas valve
11 Orifice (air)
12 Indication of operating state (LED)
Legend ∆pG Differential pressure across orifice on the gas side

∆pL Differential pressure across orifice on the air side
A Air heating coil (recuperator)
B Burner
M Actuator
9/25

• Adjustment of governor on modulating burners prior to startup:

- The adjusting screw c on the SKP55... should be set to a gas / air ratio curve
which passes through the neutral point. The SKP55... is supplied with that fac-
tory setting.
Adjustment in the field can be made as follows:
Note:
Fit cap again before measuring the combustion value and after the setting is
made.
Turn adjusting screw c in counterclockwise direction until spring i is com-
pletely loose. Shut off the gas supply upstream of the SKP55... Switch on the
SKP55... Turn adjusting screw c in clockwise direction until valve opens
- Bring the adjustable orifice k to the precalculated value. That value with the
same pressure differential on the air and gas side must lead to practically stoi-
chiometric combustion
- Start the burner and run it to about 90 % of the nominal load
- Measure the combustion quality and make adjustments of the flow rate with the
adjustable orifice k until optimum measured values are reached (fine adjust-
ment)
- Return to low-fire operation. Check the combustion and readjust if necessary
the position of the working characteristic with the setting screw c on the
SKP55... until optimum measured values are reached. Clockwise rotation →
more gas. Counterclockwise rotation → less gas, that is, parallel displacement
of the working characteristic towards lack of air or excess air
- Limit the air damper j for low-fire operation
- If a significant parallel displacement of the working characteristic was required,
the setting must be checked again at 90 % of the nominal load and then read-
justed, if required
- Run the burner to the predefined nominal load with the help of the air damper
j and limit the actuator position for that load
- Check the flue gas values at a few positions of the load range. Make readjust-
ments in the nominal load range with the adjustable orifice k, and in the low-
fire range with screw c on the governor of the SKP55...
10/25


with valve
Legend
PGas
1 Piston
Luft / Air
4
2 Oscillating pump
3 Oil reservoir
4 Pressure chamber
SKP75...
1
5 Stem
6 Valve´s closing spring
7 Control valve
7
5
8
> 6 mm
VG.../VL.../VR...
min. 5d
pE
7643z33/0304
6
Adjustment of the gov- • Use setting screw c / «PGAS» / «PAIR» to set the gas / air ratio to the required
ernor on modulating value (coarse setting) and the scale with setting screw d to zero (refer to
burners fig. 7643z03)
• Start the burner and run it to about 90 % of the nominal load
• Measure the CO2 or O2 content of the flue gases and optimize the adjustment with
setting screw c / «PGAS» / «PAIR» (refer to fig. 7643z03)
• Return to low-fire operation, check the CO2 or O2 content of the flue gases. If nec-
essary, readjust position of the working characteristic with setting screw d/
until optimum measured values are attained
• Limit the air damper position for low-fire operation
Meaning of setting screw markings:

+ more gas
- less gas
11/25

If a significant parallel displacement of the working characteristic was required to obtain

optimum CO2 or O2 values in low-fire operation, the adjustment of the pressure ratio at
nominal load or 90 % of the nominal load must be checked again and readjusted, if
required.
• Run the burner to the required output and limit the nominal load air damper position
• Check the flue gas values at various positions of the load range
If readjustments are required:

- Use setting screw c / «PGAS» / «PAIR» in the nominal load range
- Use setting screw d/ to make parallel displacements of the characteristic in
the flow-fire range
If the gas / air pressure ratio lies outside the setting range, an orifice in the gas or air
flow can be used to adjust the pressure at the test points on the burner side. Prerequi-
site is that there is a sufficient gas or air pressure reserve on the inlet side.
PGas
C
M B
~
pA A
pC
M B
C
pA
SKP75... 0,4
1 PLuft
9 7643d07/0503
-
2
+
pE pG
7643z03/0304
VG...
c Setting and display of the gas / air ratio 3
d Setting and display of parallel displacement of the

working characteristic 5
4
e Test point for combustion chamber pressure
f Test point for air pressure

1 2
g Test point for gas pressure
h Stroke indication
i Operation indicator (LED) 6
j Gas valve VG... 7

7643z16/1003
12/25

Function If the air pressure exceeds the maximum value of
• 30 mbar with a PGas / PAir ratio of ≥ 2

• 50 mbar with a PGas / PAir ratio of ≤ 2
permitted for the governor, the pressure must be lowered with a reducing T-piece
AGA78 (also refer to «Technical data»).
P1 Example:
p1 = 70 mbar
130 D1 = 1.5 mm
120 D2 = 1.7 mm
110
m
100 m Wanted: Air pressure signal «p2» for
2
=
90 2 the SKP75...
;D
m p2 = 26 mbar
80 m mm
5
1, 1 ,7
70 = 2=
D1 m;
D
60 m
= 1,5
50 D1
7643d02/0503
40
30
20
10
10 20 30 P2
Air is continuously vented to atmosphere via orifice «D2». The pressure of the following
medium will be reduced via throttle «D1». The illustration below shows the correlations.
p1
AGA78
P1 D1 Burner
D1
M
P2 "Air"/SKP7...
p2
D2
7643z02e/1003
D2
The reducing T-piece AGA78 is supplied ready for mounting, with D1 = 1.5 mm and
D2 = 1.7 mm.
D2 with a diameter of 2 mm is included as a loose item.
13/25

Standards and certificates
ISO 9001: 2000 ISO 14001: 1996

Cert. 00739 Cert. 38233
In connection with Conformity to EEC directives

VG... valves – Electromagnetic compatibility EMC (immunity) 89 / 336 EEC
– Directive for gas appliances 90 / 396 EEC
– Directive for pressure devices 93 / 23 EEC
Service notes
• Make the safety test according to «Commissioning notes»
Disposal notes
The actuator contains electrical and electronic components and hydraulic oil and must
not be disposed of together with domestic waste.
Local and currently valid legislation must be observed.
Type summary (other types of actuators on request)

The complete gas shutoff assembly or pressure governor / controller assembly consists
of actuator and valve.
SKP15... Mains voltage AC 100...110 V AC 220...240 V

1-stage opening and closing, without end switch SKP15.000E1 SKP15.000E2
1-stage opening and closing, with end switch SKP15.001E1 SKP15.001E2
SKP25... 1-stage opening and closing, without end switch, with SKP25.003E1 SKP25.003E2
pressure governor up to 22 mbar
1-stage opening and closing, with end switch, with pres- SKP25.001E1 SKP25.001E2
sure governor up to 22 mbar
1-stage opening and closing, without end switch, zero SKP25.303E1 SKP25.303E2
governor version
1-stage opening and closing, without end switch, with SKP25.403E1 SKP25.403E2
pressure governor up to 1,500 mbar, high-pressure ver-
sion
1-stage opening and closing, with end switch, with pres- SKP25.401E1 ¹) SKP25.401E2 ¹)
sure governor up to 1,500 mbar, high-pressure version
¹) On request
differential pressure governor
1-stage opening and closing, with end switch, with differ- SKP55.001E1 SKP55.001E2
ential pressure governor
pressure ratio controller
1-stage opening and closing, with end switch, with pres- SKP75.001E1 SKP75.001E2
sure ratio controller
1-stage opening and closing, without end switch, with SKP75.503E1 SKP75.503E2
pressure ratio controller, with greater parallel displace-
ment
1-stage opening and closing, with end switch, with pres- SKP75.501E1 ---
sure ratio controller, with greater parallel displacement
14/25

Ordering examples
When ordering, please give the complete type reference of the actuator (refer to «Type
summary»). All products must be ordered as separate items.
Example of SKP15... Actuator

- On / off
- With end switch
- For AC 230 V / 50 Hz SKP15.001E2
Connector valve actuator (plug) AGA64
Connector end switch (plug) AGA65
The complete gas valve shutoff pressure governor assembly consists of actuator and
valve. Please order the required valves as separate items (refer to the relevant Data
Sheets). Actuator and valve are supplied unassembled. Assembly is very straightfor-
ward and wird vorzugsweise am Brenner vorgenommen.
Complete combination of actuator / valve consisting of:

- VG... gas valve
- SKP15.001E2 actuator
- Accessories
Example of SKP25... Gas pressure governor with safety shutoff feature:

- Without end switch SKP25.003E2
- For AC 230 V / 50 Hz
Connector valve actuator (plug) AGA64
Combination of gas pressure governor / valve consisting of:

- VG... gas valves (refer to Data Sheets N7636 and N7631)
- SKP25.003E2 actuator
- Accessories, e.g. AGA25 (damping throttle)
15/25

Accessories (not supplied as standard, to be ordered as separate items)
Connecting cable with plugs AGA62.000A000
- For powering both SKPs on the double valve (VGD...)
with connector (AGA64)
Connector for valve actuator (power supply) AGA64

- Plug-in connector conforming to DIN EN 175301-803-A
- Triple pole +
- 6...9 mm dia. / max. 1.5 mm²
Connector for end switch AGA65

- Plug-in connector conforming to DIN EN 175301-803-A
- Triple pole +
- 4.5...11 mm dia. / max. 1.5 mm²
Setpoint spring (yellow) for SKP25... AGA22

- Optional to standard spring (0...22 mbar)
- 15...120 mbar
- Standard spring in SKP25.4...
Setpoint spring (red) for SKP25... AGA23

- 100...250 mbar
- 0...1,500 mbar with SKP25.4... (optional to AGA22)
Setpoint spring (unpainted) for SKP25.3... and SKP55... AGA28

- ±1.5 mbar
Setpoint spring (unpainted) for SKP25... AGA29

- 0...22 mbar
Damping throttle for SKP25... AGA25

- Optional
Damping throttle for SKP55... AGA75

- Optional, pipe connection for 8 mm dia.
- Refer to Mounting Instructions 4 319 2078 0
Damping throttle for SKP55... AGA75E

- Optional
(Same as AGA75 but with ¼“ threaded connection on both sides)
Pressure reducing-T-piece for SKP75... AGA78

- Optional
16/25

Technical data
General device data Mains voltage AC 220 V –15 %...AC 240 V +10 %
AC 100 V –15 %...AC 110 V +10 %
Mains frequency 50...60 Hz ±6 %
Power consumption max. 13.5 VA
End switch (if fitted) factory set as closed position switch valve
fully closed
- Switching capacity 4 (2 A, cosϕ = 0.3)
On time 100 %
Opening time for full stroke 6...10 s (depending on nominal valve size,
longer opening times below 0 °C)
Opening speed approx. 2 mm / s
Closing time < 0.8 s (in the event of power failure)
Perm. mounting positions
7643z07/0603
always with the diaphragms in the vertical

position
Degree of protection IP 54
→ only ensured when central screw at the
connector is tightened
Stroke max. 26 mm (valve limits max. stroke)
Weight
- SKP15... approx. 1.1 kg
Perm. media depending on the type of valve
Medium inlet pressure «PE» depending on the type of valve
Perm. medium temperature depending on the type of valve
Flow rate depending on the type of valve
Perm. test pressure «PG» 1,000 mbar
Perm. underpressure «PG» 200 mbar
17/25

Technical data (cont´d)
Environmental Storage DIN EN 60 721-3-1

conditions Climatic conditions class 1K3
Mechanical conditions class 1M2
Temperature range -20...+60 °C
Humidity < 95 % r.h.
Transport DIN EN 60 721-3-2
Climatic conditions class 2K2
Operation DIN EN 60 721-3-3
(longer opening times below 0 °C)
Condensation, formation of ice and ingress of water are not permitted!
SKP25... Setpoint range of outlet pressure 0.5...250 mbar

(3 setpoint springs, refer to «Accessories»)
Control class A to DIN EN 88
Setting range (setpoint) max. 250 mbar (gas pressure)
Control group III to DIN 3392
SKP25.3… Combustion air pressure max. 50 mbar

Zero governor to EN 12067-1
Compensating variable differential pressure of combustion air
≥ 0.5 mbar
Differential pressure ratio (gas / air) 1:1
Parallel displacement PGas ±1 mbar
SKP55... Differential pressure ratio (gas / air) 1:1

Perm. differential pressure the controller ∆0.3...200 mbar
may be subjected to during operation
Control accuracy < 10 % at «∆pmin»
< 1 % at «∆pmax»
Parallel displacement of working
characteristic
- Excess gas 1 mbar
- Excess air 1 mbar
Compensating variable differential pressure of combustion air
≥ 0.3 mbar
Interval required for load change via air min. 5 s (depending on valve stroke)
damper, from high-fire to low-fire
18/25

Technical data (cont´d)
SKP75... Control accuracy < 10 % at «∆pmin»

< 2 % at «∆pmax»
Control group III to DIN 3392
Control variable «Gas pressure» differential pressure «PG-PF» or «PG-PAir»
min. 0.8 mbar
max. 120 mbar
Control class A to DIN EN 88
Compensating variable differential pressure of combustion
air (across burner baffle plate «PAir –
Pcombustion chamber»)
≥ 0.5 mbar
Air pressure at «PGas/PAir»
-≥2 max. 30 mbar
-≤2 max. 50 mbar
- for higher pressures, see AGA78 max. 150 mbar
(accessory)
Setting range pressure ratio refer to «Type summary»
- «Pgas / PAir» 0.4...9
Parallel displacement of working
characteristic
- Excess gas 1 mbar
- Excess air 1 mbar
- Excess with SKP75.5... 4.5 mbar
Perm. combustion chamber pressure depending on the controlled variable gas
pressure «PG»
Recommended distance impulse pipe con- min. 5 x nominal valve size at a location
nection from valve where there is no turbulence
Inlet pressure same as valve
Perm. test pressure «PG» 1 bar
Perm. underpressure «PG» 200 mbar
Interval required for load change via air min. 5 s (depending on valve stroke)
damper, from high-fire to low-fire
Motorized setpoint Mains voltage (control voltage) AC 220 V –15 %...AC 240 V +10 %
adjuster SQS27... depending on type AC 100 V –15 %...AC 110 V +10 %
Mains frequency 50...60 Hz ±6 %
Connecting cable length 1.5 m
Power consumption 1.3 VA
Running time ∆t∆wom max. 75 s (refer to «Type summary»)
Degree of protection IP 40 (to be ensured through mounting)
Safety class III to VDE 0631
Contact assignment device connector

7643z10/0903
1 2
3
3
2
← Valve closed
1
Valve actuator End switch
Connector AGA64 Connector AGA65
DIN EN 175301-803-A DIN EN 175301-803-A
double pole + triple pole +
19/25

Dimensions
Dimensions in mm
SKP15... actuators
188
7643m02e/1204
Hexagon socket A/F4 83

9
15.8
M5 18.3
30.5
Device connector Detail X

valve actuator to
74
87
DIN EN 175301-803 Device connector end switch to

design A, double pole + DIN EN 175301-803
design A, triple pole
74
9
86
64
M3 Tightening torque
18 central fixing screw 0.4 Nm
20/25

Dimensions (cont´d)
Dimensions in mm
SKP25.0... / SKP25.3...
actuators
96,2
32,5
Rp1/4
Rp1/4
Pressure nozzle
221
202
200
X
188
168
Hexagon socket A/F4 83
9
7643m08e/1204
15,8
M5
86 18,3
64
Device connector
valve actuator to 30,5
74 DIN EN 175301-803 6,3
design A, double pole + Detail X
Device connector end switch to

DIN EN 175301-803
design A, triple pole +
106
87
74
9
4,8
98
141 Tightening torque
central fixing screw 0.4 Nm
M3
18
21/25

Dimensions in mm
SKP25.4... actuators
71,7
32,5 Rp1/4
Rp1/4
Pressure nozzle
220,8
207,3
201,8
187,6
167,8
Hexagon socket A/F4
83
9
7643m07e/1204
M5 15,8
86 18,3
74 30,5
Device connector
valve actuator to Detail X
DIN EN 175301-803
design A, double pole + Device connector end switch to
DIN EN 175301-803
106
87
74

9
64
105,1
M3 Tightening torque
148
18 central fixing screw 0.4 Nm
22/25

Dimensions in mm
SKP55...
92,7
58,2
32,5 50
Rp1/4
Rp1/4 +Air ATMOSPHERE
Pressure nozzle
233
207
202 X
168
188
83
Hexagon socket A/F4

9
7643m09e/1204
M5 15,9
86 18,2
64
Device connector
valve actuator to
Rp1/4
DIN EN 175301-803
design A, double pole +
30,5
6,3
Detail X
106
87
74

DIN EN 175301-803
9
74
9
126
4,8
169
Tightening torque
M3
18
23/25

Dimensions in mm
SKP75...
58,4
32,5
Rp1/4
Rp1/4
Pressure nozzle
Rp1/4
242
269
X
203
188
188
83
Hexagon socket A/F4

9
7643m10e/1204
M5 15,8
86 18,3
64
30,5
Device connector 6,3
valve actuator to Detail X
DIN EN 175301-803
design A, double pole +
146

87
74
DIN EN 175301-803
9
74
4,8
126
169
Tightening torque
M3
18
24/25

Dimensions in mm
Connecting cable
AGA62.000A000 for
two SKP...
N
Contact designation
L2
PE
PE
1 2
2 1
L1 N
32
25
210 10
Tightening torque
L1
L2
PE
7643m01e/1204
N
Connection diagram
L1 L2 N PE
L1 N PE L2 N PE
©2005 Siemens Building Technologies HVAC Products GmbH

Subject to change! 25/25

7 221
Pressure Switches QPLx5…
The pressure switches are used for monitoring gas or air pressures.
When the pressure falls below or exceeds the adjusted switching point, the re-
spective electrical circuit will be opened or changes over.
The QPLx5... and this Data Sheet are intended for use by OEMs which integrate
the pressure switches in their products.
Use
• For the supervision of air or gas pressures in gas trains of gas-fired equipment (gas
burners)
• The QPLx5... are suitable as pressure switches for minimum or maximum pressure
• Adjustable working pressure range up to 500 mbar
• Able for a permanent operation pressure up to 690 mbar
• Suited for gases of gas families 1, 2 and 3 and other neutral gaseous media
CC1N7221en
Building Technologies
Warning notes
To avoid injury to persons, damage to property or the environment, the following
warning notes should be observed!
Do not open, interfere with or modify the pressure switch!
• All activities (mounting, installation and service work, etc.) must be performed by
qualified staff
• Before making any wiring changes in the connection area of the switch, completely
isolate the equipment from the mains supply (all-polar disconnection)
• Fall or shock can adversely affect the safety functions. Such units must not be put
into operation, even if they do not exhibit any damage
• Do not use the pressure switch in inflammable or explosive gas atmospheres
Engineering notes
Setting the To set the required switching point, remove the cover from the pressure switch and turn
switching point the setting knob clockwise to increase the set value, or counterclockwise to decrease it
(see scale under «Dimensions»). Replace the cover and secure it to prevent tampering.
Mounting notes
• Ensure that the relevant national safety regulations are complied with
• By check piping connections ensure that there are no leaks
• The pressure switch can be mounted either horizontally or vertically, but not in a
suspended position (scale must not pointing downward)
• The pressure switch can be connected via a ¼“ thread or O-ring, depending on the
type of switch
• Refer also to following Mounting Instructions: M7221 → 74 319 0551 0
Connection via ¼“ (ISO) thread Connection via O-ring
QPL25… QPL15…
Gas pressure
test point
Gas pressure
test point
Mounting side Gas inlets
(optional) (bottom,
optional)
Standard base
7221z06e/1005
7221z05e/1005
O-ring and self-forming screws are in-

cluded in delivery.
2/6
Building Technologies CC1N7221en

Standards and certificates
Conformity to EEC directives
- Electromagnetic compatibility EMC (immunity) 89 / 336 / EEC
- Directive for gas-fired appliances 90 / 396 / EEC
- Pressure sensing devices for gas burners and gas-fired EN 1854
appliances (CE 0085 BR 0021)
ISO 9001: 2000 ISO 14001: 2004

Cert. 00739 Cert. 38233
Disposal notes
The unit contains electrical and electronic components and must not be disposed of
together with domestic waste.
Local and currently valid legislation must be observed.
Mechanical design
- Housing made of durable plastic with die-cast aluminium base
- Adjustable switching point
- Automatic reset
The switching point (setpoint) of the pressure switch is to be set with the adjusting knob
located under the securing cover. The pressure switch comes calibrated and has been
checked for leaks.
Type summary
When ordering, please give type reference according to «Type summary».
Pressure switches with automatic reset:
Pressure range ¼“ connection O-ring connection

0,7…3 mbar QPL25.003 QPL15.003
2…10 mbar QPL25.010 QPL15.010
5…50 mbar QPL25.050 QPL15.050
5…150 mbar QPL25.150 QPL15.150
100…500 mbar QPL25.500 QPL15.500
Accessories
Contact box AGA65

- Plug-in connector according to DIN EN 175301-803-A
- Triple pole +
- 4.5...11 mm dia. / max. 1.5 mm²
3/6

Technical data
General data Switching voltage DC / ACeff max. 250 V
Switching current ACeff max. 6 A at cosϕ 1
AC eff. max. 2 A at cosϕ 0.5
AC eff. min. 20 mA
DC max. 1 A
DC min. 20 mA
Adjustable operating pressure range 1.5... 500 mbar (different ranges, refer to
«Type summary»)
Operating pressure (short-time) pressure max. 1,000 mbar for max. 30 s
surge
Operating pressure (continuously) max. 690 mbar
Weight approx. 120 g
Mounting position horizontal or vertical, but not suspended
Safety class II to VDE 0631
Degree of protection IP54
Switching pressure deviation ±15 %, referred to the setpoint
(diaphragm in vertical position)
Gas families I, II, III
Typical hysteresis:
Type reference Switching differential

QPL… < 3 mbar 0.3 mbar
QPL… < 10 mbar 0.5 mbar
QPL… < 50 mbar 1 mbar
QPL… > 100 mbar 5 mbar
Environmental Storage DIN EN 60721-3-1

conditions Climatic conditions class 1K3
Operation DIN EN 60 721-3-3
Condensation, formation of ice and ingress of water are not permitted!
4/6

Connection diagram
Function when Pressure switch for minimum pressure Pressure switch for maximum pressure
When the pressure falls below the set When the pressure exceeds the set value,
value, NO opens and NC closes NC opens and NO closes
2 2
7221d01/1005
7221d01/1005
NO NO
COM COM
3 NC 3 NC
P 1 P 1
Connection via
connector AGA65
according to DIN43650
Connection examples
QPLx5… fitted to QPLx5… fitted to VGD40…
VGD20…4011 / VGD20.5011
5/6

Dimensions
Dimensions in mm
QPLx5…
Adjustment knob
safety cover
Safety
screw
Gas pressure
Adjustment knob range test point
47.63
Gas inputs
(bottom)
optional
95.25
NO Gas pressure
Gas inputs
test point
(on the side
and bottom)
COM optional
7221m05e/0407
50.8
NC
Note: Dimensions for reference only Switch contacts 1/4" Mounting side (optional)

6/6 Subject to change!

7 712
QRA10... QRA53..., QRA55... mit Bride QRA2... mit Bride
Flammenfühler QRA2...
QRA10...
QRA53...
QRA55...
Flammenfühler für unsere Feuerungsautomaten zur Überwachung von Gas- und

Ölflammen.
QRA... und dieses Datenblatt sind für Erstausrüster (OEM) bestimmt, die QRA...
in oder an ihren Produkten einsetzen.
Anwendung
Die Flammenfühler werden zur Überwachung von Gasflammen, gelb- / blaubrennen-
den Ölflammen sowie zur Zündfunkenkontrolle eingesetzt.
Flammenfühler für Feuerungsautomaten Betriebsart

QRA2..., QRA10... LGB2... / LGB4... mit AGQ1... intermittierend
LFL...
LFE1...
LFE10...
LMG... mit AGQ2...
QRA53..., QRA55... LGK16... Dauerbetrieb
LGI16...
CC1N7712de
Siemens Building Technologies
Warnhinweise
Die Beachtung folgender Warnhinweise hilft Personen-, Sach- und Umweltschä-
den zu vermeiden!
• Alle Tätigkeiten (Montage, Installation, Service usw.) müssen durch dafür qualifi-
zierte Fachkräfte erfolgen
• Schalten Sie vor sämtlichen Arbeiten im Anschlussbereich die Spannungsversor-
gung allpolig ab
• Sorgen Sie durch geeignete Maßnahmen für den Berührungsschutz an den elektri-
schen Anschlüssen
• Überprüfen Sie die Verdrahtung auf ihren ordnungsgemäßen Zustand
• Halogenlampen, Schweißgeräte, Speziallampen sowie der Zündfunke können
einen ausreichend hohen UV-Anteil ausstrahlen, so dass die Zelle zündet. Rönt-
gen- und Gammastrahlung können ebenso ein falsches Flammensignal erzeugen
• Nach einem Sturz oder Schlag dürfen diese Flammenfühler nicht mehr in Betrieb
genommen werden, da Sicherheitsfunktionen auch ohne äußerlich erkennbare Be-
schädigungen beeinträchtigt sein können
Montagehinweise
• Beachten Sie die jeweils geltenden nationalen Sicherheitsvorschriften
Installationshinweise
• Verlegen Sie die Hochspannungszündkabel immer separat mit möglichst großem
Abstand zum QRA... und zu anderen Kabeln
Elektrischer Anschluss der Flammenfühler

Wichtig ist eine möglichst störungsfreie und verlustlose Signalübertragung:
• Verlegen Sie die Fühlerleitung nicht mit anderen Leitern
– Leitungskapazitäten verringern die Größe des Flammensignals
– verwenden Sie ein separates Kabel
• Beachten Sie die zulässige Länge der Fühlerleitung, siehe «Technische Daten»
2/8
Siemens Building Technologies CC1N7712de

Inbetriebnahmehinweise
• Überprüfen Sie vor Inbetriebnahme die Verdrahtung auf ihren ordnungsgemäßen
Zustand
• Ein störungsfreier Brennerbetrieb ist nur dann gewährleistet, wenn die Intensität
der UV-Strahlung am Einbauort des Fühlers noch so groß ist, dass dieser während
jeder Halbwelle sicher zündet.
Die Kontrolle der Intensität der UV-Strahlung am Einbauort des Fühlers erfolgt
durch Messung des Fühlerstroms.
Messschaltung für 9 10 LFE10...

QRA2..., QRA10... und
QRA5...Serie D bl sw AGQ1... / AGQ2...
22 23 LGK16...
23 22 LFL1...
15 13 LFE1...
7712v01/1001
Legende 1) Schaltung des Mikroampèremeters zwischen Adapter AGQ1... / AGQ2... und Flammenfühler
A Strahlungseinfall
M Mikroampèremeter Gleichstrom, Innenwiderstand ≤ 5000 Ω
C Elektrolytkondensator 100...470 µF, DC 10...25 V
Messschaltung für
QRA5... bis Serie C QRA53... AGM19 LGK16...
QRA55... LGI16...
- +
M KF8832
7712v03/9602
Notwendige minimale Fühlerstromwerte:

Siehe entsprechende Datenblätter der Feuerungsautomaten bzw. Betriebsanleitung
des KF8832.
Zertifikate
Konformität mit EG-Richtlinien
- Elektromagnetische Verträglichkeit EMV (Störfestigkeit) 89 / 336 EWG
ISO 9001 : 2000 ISO 14001 : 1996 Nur QRA2...

Zert. 00739 Zert. 38233
Für Anwendungen in den USA / Kanada sind die Flammenfühler mit und ge-
kennzeichnet.
3/8

Servicehinweise
• Überprüfen Sie nach jedem Flammenfühleraustausch die Verdrahtung auf ihren
ordnungsgemäßen Zustand
• Setzen Sie den Serviceadapter KF8832 nur kurzzeitig ein
Entsorgungshinweise
Die Flammenfühler enthalten elektrische und elektronische Komponenten und dürfen
nicht als Haushaltsmüll entsorgt werden.
Die örtliche und aktuell gültige Gesetzgebung ist unbedingt zu beachten.
Ausführung
Flammenfühler QRA2... Kunststoffgekapselte Ausführung, metallisiert zur Verhinderung statischer Aufladung im
Luftstrom des Gebläses, für direkte Befestigung am Brenner.
Lieferung wahlweise mit / ohne Flansch und Bride, siehe «Typenübersicht».
Flammenfühler Fühlergehäuse aus Aluminiumspritzguss mit 1“-Gewindemuffe (D) und Anschlussmög-

QRA10... lichkeit für Kühlluft. Das Gehäuse dieses Fühlers wird mit Bajonettverschluss entweder
direkt auf der 1“-Gewindemuffe oder auf dem AGG06 befestigt. Die 1“-Gewindemuffe
kann auf einem Schaurohr oder am AGG07 festgeschraubt werden. Die angebrachte
Pg-Verschraubung ist lösbar und kann für den Einsatz einer anderen Fühlerleitung
ausgetauscht werden.
Flammenfühler QRA5... Die UV-Zelle befindet sich hinter einer Schwenkblende am vorderen Ende des am Ge-
häuse angeflanschten Fühlerrohrs. Ein Quarzglasfenster schützt Zelle und Blende vor
Verschmutzung. Im Fühlergehäuse befindet sich ein Schrittmotor als Blendenantrieb
sowie die für die Blendensteuerung erforderliche Elektronik. Dieser Flammenfühler
kann entweder direkt am Brenner oder mittels AGG16.C auf einem Schaurohr bzw.
Schauloch zum Feuerraum montiert werden.
Stecker AGM19 Stecker AGM19 mit Kabel für den elektrischen Anschluss der Flammenfühler QRA53...
und QRA55...
Adapter AGG16.C Adapter AGG16.C für QRA53..., QRA55... aus Aluminiumspritzguss mit 1“-Gewinde-
muffe. Die 1“-Gewindemuffe (D) ist mit einem Bajonettverschluss am Gehäuse befestigt.
QRA5...
AGG16.C
AGG03
7712m08/0797
AGG06
AGG02
AGG06
AGG05 QRA5... mit AGG16.C und AGG06

7712z05/0403
AGG07
Hinweis AGG03 oder AGG02 lassen sich auch in die 1“-Gewindemuffe (D) des AGG16.C (oder
QRA10...) einbauen. Adapterkombination mit AGG06, Befestigungsmuffe und Kugelge-
lenk für QRA53..., QRA55... und QRA10... möglich.
4/8

Glas- und Quarzglaslin- Der Glas- und Quarzglaslinsenhalter AGG06 nimmt die Linse AGG03 und das Wärme-
senhalter AGG06 dämmglas AGG02 auf.
Der Einsatz der Linse erhöht die Empfindlichkeit.
Das Wärmedämmglas bietet Schutz vor hohen Temperaturen und dient damit der Ver-
längerung der Lebensdauer der UV-Zelle.
Außerdem gestattet der AGG06 verschiedene Zusammenbaukombinationen mit Linse,
Wärmedämmglas sowie 1“-Gewindemuffe.
Bei der Verwendung von Linse und Wärmedämmglas muss AGG06 mit der Linse an
die nächstliegende Position zum Flammenfühler eingebaut werden.
AGG16.C AGG16.C
AGG03! AGG02
AGG06 AGG06
7712z06/0403
AGG02 ! AGG03
7712z07/0403
AGG06 AGG06
richtig falsch
AGG06 wird mittels Bajonettverschluss am Gehäuse des AGG16.C oder am Fühlerge-

häuse von QRA10... und an der 1“-Gewindemuffe befestigt.
AGG06 kann durch die beidseitigen Bajonettverbindungen leicht aus der entsprechen-
den Zusammenbaukombination mit QRA10... oder AGG16.C sowie QRA53... oder
QRA55... gelöst werden.
Damit lassen sich Glas oder Linse schnell und einfach reinigen, ohne dass diese aus
dem AGG06 ausgebaut werden müssen.
Die Zwischenringe dienen der Anpassung der Gängigkeit der Bajonettverbindungen.
Sie werden vor allem dort eingesetzt, wo man nach Entfernen des Flammenfühlers die
Öffnung zum Feuerraum als Schaurohr verwenden will.
Durch Einsetzen des Zwischenrings an der richtigen Bajonettverschlussverbindung
kann erreicht werden, dass bei Drehung am Gehäuse von QRA10... oder AGG16.C
sich die Kombination an einer gewünschten Stelle löst.
Quarzglaslinse AGG03 AGG03 mit Federring und O-Ring, zur Erhöhung der Empfindlichkeit.
Wärmedämmglas Wärmedämmglas AGG02 mit Federring und O-Ring, gleiche Einbaumöglichkeiten wie
AGG02 für AGG03.
Der Einsatz dieses Wärmedämmglases wird erforderlich, wenn die Temperatur am
Flammenfühler 80 °C überschreitet.
Gewindemuffe (D) Die 1“-Gewindemuffe kann mit Bajonettverschluss entweder am AGG06, am AGG16.C
oder am QRA10... befestigt werden.
Auslieferung mit QRA10... bzw. AGG16.C.
Nippel AGG05 1“-Nippel AGG05 für die Verbindung der 1“-Gewindemuffe (D) mit AGG07.
Kugelkopf AGG07 Kugelkopf AGG07 mit 1“-Innengewindeanschluss.

Anschluss an AGG05 und damit an die 1“-Gewindemuffe sowie an AGG06.
AGG07 eignet sich zur Befestigung auf einer festen Unterlage, z.B. der Kesselwand.
Er ermöglicht ein optimales Einstellen des Sichtwinkels auf die Flamme.
5/8

Typenübersicht
Flammenfühler Typ Empfind- Flansch Klemmen- Ersatz-UV-Zelle
lichkeit mit Bride deckel
QRA2 ohne
QRA2(1) normal mit schwarz AGR4 502 1131 0
QRA2.9 ²) ohne
QRA2M hoch ohne grün AGR4 502 4065 7
QRA2M(1) mit
QRA10.C normal --- --- AGR4 502 1131 0
QRA10M.C hoch AGR4 502 4065 7
Typ Empfind- Fühlerrohr- Netzspannung Ersatz-UV-Zelle

lichkeit länge
QRA53.C27 normal AC 220...240 V
QRA53.C17 125 mm AC 100...110 V
QRA53.D27 hoch AC 220...240 V
QRA53.D17 AC 100...110 V AGR4 502 4065 7
QRA55.C27 normal AC 220...240 V
QRA55.C17 77 mm AC 100...110 V
QRA55.D27 hoch AC 220...240 V
QRA55.D17 AC 100...110 V
Hinweis Alle QRA5... werden mit Bride ausgeliefert. Für den Anschluss wird ein Anschlusskabel
AGM19 (siehe «Zubehör» für QRA5...) benötigt.
Zubehör zu QRA2... Bestandteil zu Typ Bestellnummer

und QRA5... für Einzel- Flansch ³) mit Radius QRA2... 4 241 8855 0
bezug Flansch gerade QRA2... 4 241 8898 0
Bride ³) QRA2... 4 199 8806 0
Bride für Direktmontage 4) QRA5... 4 199 1034 0
Zubehör zu QRA5... Typ Bezeichnung

AGG16.C Adapter für Flammenfühlermontage QRA53... und QRA55...
AGM19 Anschlusskabel (2 m) mit Stecker zu QRA53..., QRA55...
KF8832 Gerät zur Fühlerstrommessung mit QRA53..., QRA55... bis einschließlich
Serie C empfohlen
Zubehör zu QRA10... Typ Bezeichnung

und AGG16.C AGG02 Wärmedämmglas mit Federring und O-Ring
AGG03 1) Quarzglaslinse mit Federring und O-Ring
AGG05 Nippel 1“
AGG06 Glas- oder Quarzglaslinsenhalter mit Zwischenring
AGG07 Kugelkopf mit 1“-Innengewindeanschluss, Schwenkbereich 14°
AGG16.C KF8832 AGM19 AGG05 AGG06 mit AGG07

Zwischenring
Legende 1) für Geräte der Serie B ist die Linse AGG01 lieferbar
2) mit wärmebeständigem Gehäuse für kurzzeitige (einige Sekunden) Umgebungstemperaturen bis +200 °C
3) liegt den Typen QRA2...(1) bei
4) liegt den Typen QRA5... bei
6/8

Bestellung
Geben Sie für die Bestellung die genaue Typenbezeichnung gemäß «Typenübersicht»
an.
Technische Daten
Allgemeine Gerätedaten Mittlere Lebensdauer der UV-Zelle ~ 10´000 h bei max. +50 °C,
höhere Umgebungstemperaturen verrin-
gern die Lebensdauer beträchtlich
Zulässiger Feuerraumdruck
- QRA10... max. 50 mbar
- QRA10... + AGG03 oder AGG02 max. 500 mbar
Schutzart
- QRA2... IP 40
- QRA10... IP 54
- QRA53..., QRA55... IP 54
Einbaulage beliebig
Gewicht
- AGG01 ca. 10 g
- AGG02 ca. 10 g
- AGG03 ca. 10 g
- AGG05 ca. 170 g
- AGG06 ca. 160 g
- AGG07 ca. 1330 g
- AGG16.C ca. 650 g
- QRA2... ca. 60 g
- QRA10... ca. 740 g
- QRA10... + AGG03 ca. 750 g
- QRA53..., QRA55... ca. 900 g
Fühlerkabel (nur QRA2...) 2 x 0,75 mm²; Ø 5,1 mm
Umweltbedingungen Lagerung DIN EN 60 721-3-1

Klimatische Bedingungen Klasse 1K3
Mechanische Bedingungen Klasse 1M2
Temperaturbereich -20...+60 °C
Feuchte < 95 % r.F.
Feuchte < 95 % r.F.
Betrieb DIN EN 60 721-3-3
Feuchte < 95 % r.F.
Betauung, Vereisung und Wassereinwirkung sind nicht zulässig!
Funktion
Bei dieser Überwachungsart wird die UV-Strahlung von Gas- und Ölflammen zur Bil-
dung des Flammensignals herangezogen.
Strahlungsdetektor ist eine UV-empfindliche Zelle mit 2 Elektroden, die durch Bestrah-
lung im Wellenlängenbereich 190...270 nm zündet und damit einen Strom in Flammen-
fühlerkreis erzeugt.
Auf nachglühende Schamottierung des Feuerraums oder Tageslicht reagiert die UV-
Zelle nicht.
7/8

Maßbilder
Maße in mm
QRA2... QRA10... AGG02
97 87 22,8
10
25...50 2,5
30
M4
SW20
52
18
66
22,5
48
18
120
SW22
7712m07/0597
''
7712M04
8
3
QRA5...
R1 ''
7712m02/0997
UV
Pg13,5
65
4 241 88550 QRA5... mit AGG05, AGG06, AGG07, AGG16.C und AGM19 AGG03
36 22,8
24,
3
R2 R4
7
R0,3
R2
30
AGG16.C
25°
15
3
7712m09/0801
7712M03
Firmenzeichen nach 3 10 18
LN 3 8380 0102
0,2 mm erhaben 24 D
48
4 241 8898 0
36
18
R4
7
25°
30
15
3
7712m10/0801
7712m01/0403
Firmenzeichen nach 3 10 24
LN 3 8380 0102
0,2 mm erhaben 48
AGG16.C
Strahlungseinfall Bride für direkte Befestigung am Brenner oder am AGG16.C

8/8 Änderungen vorbehalten!
USER HANDBOOK OF
INSTALATION, OPERATION
MAINTENANCE
CENTRIFUGAL FAN MAINTENANCE HANDBOOK
1. GENERAL INSTRUCTION FOR FANS STARTING AND RUNNING
1.1. CHECK BEFORE STARTING

z That all bolts have been normally tightened
Anchorage bolting
Bearing stands on base
Motor/base
Bearing/stands
Bearing covers/housings
Hub/shaft assembly
Inlet cones/casing
Casing/base
Inlet boxes/casing
Casing/casing
Dampers/casing inlets
Actuator/damper
Miscellaneous bolting
z Bearing lubrication control

Open bearing housing and check quantity, quality and distribution of lubricant
Running parameters of lubrication system (see specific instruction)
z Alignment control
Radial run out
Axial run out
z Free rotation of impeller

Radial clearance between impeller inlet and cone
Sealing device runs properly
Hand rotation of complete rotor with driver
z Connections
Axial deflection of flexible
Radial deflection of flexible
No load on fan connexion flanges
Page 1
z Guards control
On couplings
On cooling disk
On shaft between bearing
Inlet protective screen
Outlet protective screen
z Fitting
Damper or guide vane blades fitted for pre rotation of gas flow at impeller inlet
z Foreign objects
Fan inner inspection
Ducting inner inspection
z Protection of plant before starting

Control of conformity of electric connection
Authorisation of field responsible for starting-up
Damper or inlet guides vane closed for starting
1.2. CHECK DURING STARTING PERIOD

z Rotation direction (see table 1)
Table. 1
Backward curved Backward Forward backward

Radial vanes Open radial
blade inclined curved
Page 2
z Vibrations and sounds

Fan bearing-coupling side
Axial
Vertical
Horizontal
Sound
Fan bearing-opposite coupling

Axial
Vertical
Horizontal
Sound
Motor bearing-coupling side

Axial
Vertical
Horizontal
Sound
Motor bearing-opposite coupling

Axial
Vertical
Horizontal
Sound
z Bearing temperature
Fan bearing-coupling side 15 mn after starting
Fan bearing-opposite coupling 15 mn after starting
z Oil lubrication system

Level checking
Temperature checking
Flow rate checking
z Shaft seal
Temperature
Page 3
z Gas flow control

Actuator power supply
Voltage/pressure
Actuator control supply
Voltage/pressure
Actuator control operation
1.3. CHECK AFTER STARTING

z Running throughout the working range
Vibrations
Sound
Amp.et max.flow (as per contract)
z Bearing temperature progress

Every quarter of one hour during one hour
Every hour during 6 hours
Stuffing box temperature
Page 4
2. LIST OF COMMON TROUBLES
TROUBLE POSSIBLE ORIGIN REMEDY

2.1 Bearing A. Lubricant excess in A. Restore correct amount of lubricant
overheating bearings check grease valve working (if any)
B. Improper quality of B. Remove bearings and clean them up

lubricant lubricate again with proper lubricant
C. Lack of lubricant in C. Restore correct amount of lubricant

bearing
D. Too small radial D. Reset radial clearance

clearance in bearings
E. Loosen belt drive E. Tighten the belts according to

(slipping) manufacturer instructions
F. Cooling disk not F. Fit cooling disk on shaft

mounted
G. Excessive temperature of G. Check the running conditions restore

gas correct gas temperature
H. Ambient temperature H. For every 150C increase in temperature

over 400C of bearing, the lubrication interval
should be reduced to half of specified
value
2.2 Abnormal A. Insufficient or A. Check lubrication devices

noises in inadequate lubrication working-restore correct amount of
bearings lubricant
z whistling
sounds B. Wearing of bearings B. Replace the bearings
C. Foreign objects in C. Remove, clean up and check

z hammering bearing housing bearings-change the bearings if
or rumbling necessary and lubricate
sounds in
bearing D. Bearing damaged at D. Change the bearings
housing mounting, printing,
picking or wearing of
rolling elements
Page 5

2.3 Fan vibration A. Dust deposite on blade A. Clean up the impeller
B. Wearing strip snatching B. Check wearing-strip and replace if

off necessary
C. Irregular erosion of C. Rebalance or change the rotor

corrosion of impeller
D. Deflexion of wheel or D. Eliminate causes of

shaft caused by overheating-change the rotor
overheating
E. Poor balancing of E. Make impeller balancing

impeller
F. Wrong alignment of F. Reset alignments according to special

coupling or belt drives instruction
G. Improper tightening of G. Tighten the belts according to

belts manufacturer instruction-check
alignment
H. Poor balancing or H.Check balancing and working condition

incorrect working of of driving machines-repair or change
driving machines them if necessary
I. Poor shimming or I. Reset the shim-packing and anchoring

anchoring of motor-fan according to instructions
J.Loose bolting of bearing J.Tighten assembly bolting at required

assembly torque
K.Improper anti-vibrating K.Replace improper pads with correctly

pad mounting (resonance) selected ones
LExcessive rotation speed L.Check motor speed or belt drive

ratio-make the necessary correction
M.Surging M.Change gas flow setting until an

acceptable vibration level is reached
Page 6

2.4 Abnormal A. Foreign object in fan A. Inspect the fan-rotate the fan by hand
noises in fan
B. Internal frictions B. Check clearance between wheel and
inlet cone and between shaft and
sealing device-rotate the fan by hand
C. External frictions C. Check location and fixing of

guards-rotate the fan by hand
2.5 Premature A. Excessive vibrations A. Check and correct the various causes
wearing of of vibration
bearings
B. Improper lubrication B. Check and correct lubrication
C. Fan excited by external C. Machines or isolate the fan itself

vibration when stopped
D. Conservation of fan D. Take precautionnary measures required

when stopped without by surrounding and working conditions
precaution against (intermittent running, conservation or
corrosive agents reheating when stopped, etc)
2.6 Impossible A. Locking of rotor A. Check and rotation of the fan and
starting or investigate for the locking causes
excessive starting (frictions, obstacles etc)
time
B. Low voltage at motor B. Check the line voltage-Reinforce the
connexions line if excessive losses
C. Motor release C. Check setting of security devices
D. Too low power rating of D. Change the motor

motor
E. Improper starting E. Correct the starting equipment

process
F. Excessive power F. Make sure that flow control device are

consumption when in close position when starting
starting
Page 7

2.7 Deficiency in A. Excessive speed A. Check motor speed or belt drive
performances ratio-make the necessary correction
B. Pressure drop lower than B. Set the control devices so as to get

expected in duct work design gas flow
C. Too low rotation speed C. Check motor speed or belt drives

ration-make the necessary correction.
Tighten belts as required
D. Poor duct work design at D. Correct the design and dimensionning

fan inlet and outlet of duct work
E. Wrong rotation direction E. Reverse motor rotation direction
F. Wrong mounting of F. Reverse the direction of impeller on

impeller (double inlet) shaft
G. Excessive clearance G. Set clearances according to instructions

between impeller and
inlet cone
3.1 CLEANING AND BALANCING

Dust deposites may occur in certain installations and these may cause unbalance of the fan
impeller due to erosion or corrosion, thus gradually causing damage to the bearings.
Under such conditions, periodic vibration checks are recommended to determine any changes
in the condition of the fan.
If necessary, the fan must be cleaned or rebalanced.

Large quantities of dust deposits may also reduce the fan performance.
Page 8
3.2VIBRATION SEVERITY RANGE

Fig 2
RMS VELOCITY ACTION

Mm/s effective
00.00 04.40 Good
04.40 07.10 Check at regular intervals
07.10 11.20 Check at regular intervals and balance at convenient ime
11.20 18.00 Clean and rebalance
18.00 Shut down immediately
11.20 Alarm
18.00 Shut down
Page 9

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Manual of Large Industrial Burner

Code of Practice for Equipment Room

Please pay attention to the following points before installation:

1.1 Common terms in this manual

If the burner fails to be ignited once, it shall be notified to the maintenance

Check the following items when burning natural gas:

Model Power KW Gas consumption Nm3/h

1.3 Burner lifting IP66/IP67

EBICO unique patented technology:

1. Combustion tube 2. Cabinet 3. Body cover

1. Power supply requirements:

4.1 Installation of gas valve block

4.2 Valve block diagram

1. Filter 2. Expansion joint 3. Gas power switch

Tightness test of valve block

Functional flow inspection

4.3 Description of valve block components

VGD40. ···two-stage gas valve and SKP25 gas pressure regulator

4.3.1 Pressure switch

4.3.2 Gas filter

4.3.3 PLC automatic leak detection system (with pressure switch)

5.1 EP… GE burner

The main components of the burner:

5.1.2 Servo motor

If an actuator is replaced, the

The damper flaps are held on each

5.1.4 Ignition gun

The main parts of the ignition gun

5.1.5 Ignition gas solenoid valve

5.1.7 Regulating device for damper and gas butterfly valve

5.1.8 Flame detection device

The flame scanner for flame detectors is a UV sensor, type QRA10.

6.1 Preparations for the first start/pre-start

6.1.2 Start the burner and check the following:

6.2.1 Fan frequency

6.2.3 Damper setting and position

6.3.1 Gas pipeline

6.5 Stop and emergency stop

6.5.2 Emergency stop

The burner stops Failure

Valve leak detection

Fan pressure is too low

Too low fan

V1 valve and ignition

The actual operating conditions of the equipment in the above example:

Altitude correction table

8.2 Special problems

Failure on the touch

8.3 Reset and restart

8.4 Ignition gun

Failure Possible reason Measure

 Maintain the burner every year

Ignition cable and ion probe cable

Flame tube/flame stabilizing plate

11. Safety guidance

On / off On / off On / off On / off

SKP15... SKP25... SKP55... SKP75...

Actuators for SKPx5...

Its field of use are primarily forced draft gas burners

SKP55... The SKP55... operates as a differential pressure governor.