QRI Siemens 1-3

7 719
ISO 9001
Infrared Flame Detectors QRI...

Infrared flame detectors for use with Siemens HVAC burner controls for the su-
pervision of gas, oil or other flames that emit infrared radiation.
The QRI... are suited for burners of any capacity, either in continuous or intermit-
tent operation.
The QRI... and this Data Sheet are intended for use by OEMs which integrate the
flame detectors in their products.
Use
Key features of the QRI... flame detectors:

- Detector with infrared-sensitive flame detecting element
- Integrated flame signal amplifier
- Designed for frontal and lateral (90°) illumination
- Suited for use with burner controls type LMV5...
- Secured to the burner with a flange and a clamp
The spectral sensitivity of the QRI... is a maximum of about 2 µm, which means that it
covers the infrared radiation emitted by gas, oil, and coal flames as well as other
sources of infrared radiation.
Owing to the electronic self-supervision of the flame signal, the QRI... can be used in
connection with suitable burner controls designed for burners in continuous or intermit-
tent operation.
The sensitivity of the QRI... is such that it must be fitted behind the burner’s baffle plate.
CC1N7719en Siemens Building Technologies

26.03.2002 HVAC Products
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 flame detector!

• Before performing any wiring changes in the connection area of the QRI... , the
burner control must be completely isolated from the mains supply (all-polar discon-
nection)
• Ensure protection against electric shock hazard through appropriate mounting
• Check wiring and all safety functions prior to commissioning
• Due to its mounting location behind the baffle plate, the flame detector has a high
signal sensitivity and, therefore, identifies small variations in infrared radiation as a
flame. For this reason, make certain that so-called heat streaks after loss of flame
(emitted for example by after-glowing combustion chamber lining) will not reach the
detector as these would simulate a flame. Likewise, moving parts in the detector’s
viewing range can cause infrared radiation from the boiler (or a viewing tube) to be
modulated, thereby possibly generating sporadic detector signals. For this reason,
the burner or boiler manufacturer must make certain that such modulated radiation
cannot reach the flame detector. For example, loose cables (moving up and down
in the fan’s airstream) are not permitted within the detector’s viewing range
• Check to make sure the burner will initiate lockout when – while the burner is run-
ning – the flame detector is removed from its fixing on the burner and – without
moving it – is exposed to room lighting
• Fall or shock can adversely affect the safety functions. Such units may not be put
into operation even if they do not exhibit any damage
Mounting notes
• Ensure that the relevant national safety regulations are complied with
• Secure the flame detector to the burner with the clamp and flange provided. With
the clamp’s fixing screw loosened, the detector can be correctly adjusted against
the flame. This adjustment can be checked by watching the intensity of the flame
signal on the AZL... display and operating unit of the LMV5... burner control, or with
the help of the measurement circuit (refer to «Detector signal measurement»)
• Ensure that the connection between the metal surface of the flange and the
burner’s earthed housing is electrically conductive
Installation notes
• Installation work must be carried out by qualified staff

• Observe the permissible length of the detector cables (refer to «Technical data»)
• Always run the ignition cable separate while observing the greatest possible dis-
tance to other cables
• Test the flame detector on all applications. When used in connection with the
LMV5..., the test is to be made with a test routine (for details, refer to the Basic
Documentat ion P7550)
• Make certain that the detector’s cable does not get into contact with hot burner or
boiler surfaces
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Siemens Building Technologies CC1N7719en

HVAC Products 26.03.2002
Commissioning notes
• Commissioning and maintenance work must be carried out by qualified staff

• When commissioning the plant or when doing maintenance work, make the follow-
ing safety checks:
a) Burner startup with flame detector darkened Lockout at the end of

«TSA»
b) Burner startup with flame detector exposed to extraneous Lockout at the end of
light (e.g. light from an incandescent lamp interrupted at the pre-purge time
about 20 Hz)
c) Simulation of flame failure during operation. For that pur- Lockout or restart,
pose, darken the flame detector during operation and depending on the
maintain this status burner control’s con-
figuration
• Make a loss-of-flame test with the AZL... of the LMV5... burner control
Standards
CE conformity according to the directives of the European Union

- Electromagnetic compatibility EMC 89 / 336 EEC
- Low voltage directive 73 / 23 EEC
- Directive for gas appliances 90 / 396 EEC
Service notes
• To clean the detector’s lens, use a soft, clean cloth (free from oil and solvents)
• Check wiring and all safety functions each time a flame detector has been replaced
Disposal notes
The flame detector contains electrical and electronic components and may not be dis-
posed of together with household garbage.
Local and currently valid legislation must be observed.
Mechanical design
The QRI... has an impact-proof housing made of black plastic. The lens is fitted in a
dust-tight position.
The QRI... can be secured to the burner within its adjusting range, using the clamp and
the flange provided.
The 3-core connecting cable is ready connected to the QRI... and features cable strain
relief.
Depending on the type of burner construction, there are flame detectors for frontal or
lateral illumination available.
3/9
Siemens Building Technologies CC1N7719en

HVAC Products 26.03.2002

QRI Siemens 1-3

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7 719

Infrared Flame Detectors QRI...

Key features of the QRI... flame detectors:

CC1N7719en Siemens Building Technologies

To avoid injury to persons, damage to property or the environment, the following

Do not open, interfere with or modify the flame detector!

• Installation work must be carried out by qualified staff

Siemens Building Technologies CC1N7719en

• Commissioning and maintenance work must be carried out by qualified staff

a) Burner startup with flame detector darkened Lockout at the end of

CE conformity according to the directives of the European Union

Siemens Building Technologies CC1N7719en

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