Yorfk ZF 180 To 300
Yorfk ZF 180 To 300
Yorfk ZF 180 To 300
2
FOR YOUR SAFETY . . . . . . . . . . . . . . . . . . . . . . . 2
SYSTEM OPERATION . . . . . . . . . . . . . . . . . . 2
THERMOSTATS . . . . . . . . . . . . . . . . . . . . . . . . . . 2 INTERMITTENT IGNITION DEVICE . . . . . . . . . . . 2 INPUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 OPERATING INSTRUCTIONS . . . . . . . . . . . . . . . 3 TO SHUT DOWN THE FURNACE: . . . . . . . . . . . 3 TO LIGHT THE FURNACE: . . . . . . . . . . . . . . . . . 3 VENT SAFETY SYSTEM: . . . . . . . . . . . . . . . . . . 3 100% SHUT OFF: . . . . . . . . . . . . . . . . . . . . . . . . 3
TROUBLESHOOTING . . . . . . . . . . . . . . . . . . 7
BEFORE CALLING A SERVICE PERSON: . . . . . 7 FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in serious injury, death, or property damage. - Do not store or use gasoline or other flammable vapors and liquids in the vicinity of this or any other appliance. - WHAT TO DO IF YOU SMELL GAS: Do not try to light any appliance. Do not touch any electrical switch; do not use any phone in your building. Leave the building immediately. Immediately call your gas supplier from a neighbors phone. Follow the gas suppliers instructions. If you cannot reach your gas supplier, call the fire department. - Installation and service must be performed by a qualified installer, service agency or the gas supplier.
66441-YUM-D-1011
66441-YUM-D-1011
SAFETY INFORMATION
FOR YOUR SAFETY
Make sure that the furnace area is clear and free of combustible materials, gasoline and other flammable vapors and liquids. Be sure the furnace is free and clear of insulating material. Examine the furnace area after installation of the furnace or the installation of additional insulation. Some types of insulation are combustible. For proper operation of this furnace, air for combustion and ventilation is required. Make sure that these openings are not obstructed. For lighting or shutting down this furnace, refer to the lighting instructions provided adjacent to the burners and also located in this manual. A blocked vent roll-out switch is provided in the burner compartment. This switch is a manual reset. If the furnace fails to operate, contact a qualified service technician. Should the gas supply fail to shut off or if overheating occurs, shut off the gas valve to the furnace before shutting off the electrical supply. Then call a qualified service technician. Do not use this furnace if any part has been under water. A flood-damaged furnace is extremely dangerous. Attempts to use the furnace can result in fire or explosion. A qualified service technician should be contacted to inspect the furnace and to replace all gas controls, control system parts, electrical parts that have been wet or the furnace if deemed necessary. Determine the integrity of the installation regarding the flue gas vent, the return and supply air duct. Confirm the equipment is well supported and there are no signs of deterioration. The manufacturer recommends that main burner, ignition device and controls are inspected by a qualified service technician before each heating season.
SYSTEM OPERATION
THERMOSTATS
Set your thermostat for either heating or cooling then set it for the desired temperature. DO NOT MOVE THE THERMOSTAT RAPIDLY ON AND OFF, OR BACK AND FORTH FROM HEAT TO COOL. THIS COULD DAMAGE YOUR EQUIPMENT. Always allow at least 5 minutes between changes. Find the temperature that is most comfortable to you, and then LEAVE YOUR THERMOSTAT ALONE. (Exception is for night or vacation set back to conserve energy). Manually moving the thermostat up or down will not speed up temperature changes in your rooms. This only causes the thermostat switch to function at your command rather than responding to room temperature. Heat generated by devices other than the furnace may interfere with thermostat performance. Therefore, lamps, radios, television sets, etc. should not be placed near the thermostat.
Your unit is equipped with a cycling pilot burner. It has a Pilot Relight control designed to automatically light the pilot burner each time the thermostat calls for heat.
This furnace is equipped with an intermittent pilot and automatic re-ignition system. Do Not attempt to manually relight the pilot. Personal injury could result.
66441-YUM-D-1011 When the thermostat calls for heat, pilot gas is supplied and at the same time, sparking occurs to light the pilot gas. With the pilot lit, the flame sensor rod closes a circuit to the ignitor control which then opens the gas valve to admit main burner gas. When the room thermostat is satisfied, the electrical circuit to the gas valve is opened, closing off both main burner and pilot gas simultaneously. If the pilot burner should fail to light, contact your heating contractor or gas utility for service to insure that proper operating conditions are restored. INPUT The correct heat capacity of the furnace is regulated by the burner orifices and the gas pressure. The proper orifices are furnished but the gas pressure regulator must be adjusted by the installer or gas utility service technician. OPERATING INSTRUCTIONS TO SHUT DOWN THE FURNACE: 1. 2. Close the main gas shutoff valve(s). Turn off the electric power supply. 5. The draft fan will operate. After an adequate purge time, the electric spark igniter will light the burners. The burners will extinguish and relight automatically upon the demand of the room thermostat.
6.
VENT SAFETY SYSTEM: This gas furnace is equipped with an automatic reset high temperature sensor or rollout switch which in the unlikely event of a sustained main burner flame rollout will shut off the flow of gas by closing the main gas valve. The ignition modules will also be disabled, preventing the flow of gas to the valves. The switch is located inside the gas heat access panel above the burner inlet. Flame rollout can be caused by blockage of the power vent system, improper gas pressure or adjustment. If this event occurs the furnace will not operate properly, gas supply to the furnace should be shut off and no attempt should be made to place the furnace in operation. The system should be inspected by a qualified service technician. Refer to Figure 2 for a typical installation. 100% SHUT OFF: The ignition modules are designed for 100% shut-off. If the furnace fails to ignite within 85 seconds after a call for heat, the flow of gas (including pilot) will be shut off and the ignition module will lock out. The module can be reset by: A. B. Turning the system switch on the room thermostat to the OFF position and back to the HEAT position. Decreasing the set point of the room thermostat below the temperature in the conditioned space and returning it to its original setting. Opening and closing the unit's main disconnect switch.
TO LIGHT THE FURNACE: 1. 2. 3. Do not attempt to light manually. Open the main gas shutoff valve(s). Adjust the set point of the room thermostat above the temperature in the space. Turn on the electric power supply.
4.
C.
66441-YUM-D-1011
If the furnace continues to lock out, a qualified service technician should be called to determine the cause of the problem.
bustion and ventilation. Adequate air is important to the safe and proper operation of the unit.
ELECTRICAL SHOCK, FIRE OR EXPLOSION HAZARD Failure to follow safety warnings exactly could result in dangerous operation, serious injury, death or property damage. Improper servicing could result in dangerous operation, serious injury, death or property damage. Before servicing, disconnect all electrical power to furnace. When servicing controls, label all wires prior to disconnecting. Reconnect wires correctly. Verify proper operation after servicing.
Prior to any of the following maintenance procedures, shut off all power to the unit, to avoid personal injury.
GENERAL MAINTENANCE
In order to insure long and trouble free service from your system, we recommend periodic inspection, cleaning, lubrication and adjustment by your installing Dealer/Contractor. Be sure to ask about this service. For those who prefer to do-it-yourself, please follow the instructions listed below to care for your system. Snow or debris should not be allowed to accumulate in or around the unit. Do not permit overhanging structures or shrubs to obstruct outdoor air discharge, combustion air inlets or vent outlets on your unit. These provide air for com-
66441-YUM-D-1011
CLEANING BURNERS
Remove them from the furnace as explained in BURNER INSTRUCTIONS section in the Unit Installation Instructions. Clean burners with wire brush and vacuum as needed.
12. When replacing the center and top of the flue collector box, be careful not to tear the adjoining insulation. 13. Ensure that all seams on the vent side of the combustion system are air tight. Apply a high temperature (+500F) sealing compound where needed.
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18 x 24
9.
To install the filters, remove the filter access panel located to the left of the condensate drain connection as shown in Figure 5. NOTE: Filters must be installed with Air Flow arrows pointing inward -- toward the indoor coil. In the event the spacers in the filter section are removed, they must be reinstalled in their original position. Slide filters all the way into the filter racks provided. When more than one filter in a filter rack is required, they must butt each other when sliding into position. Replace the filter access panel.
10. After brushing is complete, blow all brushed areas with air or nitrogen. Vacuum as needed. 11. Replace parts in the order they were removed in Steps 1 thru 5.
66441-YUM-D-1011
15 TON
(2) 18" X 24" FILTERS
15 TON
(3) 18" X 24" FILTERS
BLOWER ASSEMBLY
Even with good filters properly in place, blower wheels and motors will become dust laden after many months of operation. The entire blower assembly should be inspected annually. If the motor and wheel are heavily coated with dust, they can be brushed and cleaned with a vacuum cleaner.
15, 20, 25 TON REHEAT UNITS 15 & 20 TON STANDARD & HIGH EFFICIENCY UNITS
Blower shaft bearings should be inspected on a monthly basis. At a minimum, the bearings should be relubricated every 6 months using a lithium-based grease (NLGI grade 2) recommended for ball bearing service.
25 TON STANDARD EFFICIENCY 15, 17.5, 20, 25 TON ULTRA-HIGH EFFICIENCY UNITS
Perform all maintenance operations on the blower motor with electric power disconnected from the unit. Do not attempt to lubricate bearings with the unit in operation.
Damage can occur if the bearings are overlubricated. Use grease sparingly.
MOTORS
Outdoor fan motors are permanently lubricated and require no maintenance. Ventor motor is factory lubricated for an estimated 10 year life. Indoor Blower Motor and Drive - The indoor blower motor features ball bearings that do not require periodic lubrication. Periodic lubrication of the motor and bearings can extend the life of components but is optional. If desired, every three years, using a low pressure grease gun, pump grease into the bearing grease fitting until grease just begins to show at the seals. Do not over lubricate. Use any lithium base grease recommended for ball bearing service.
Perform all maintenance operations on the damper assembly with power disconnected. Do not clean or lubricate with the unit in operation.
CONDENSER COIL
An annual check and cleaning, if necessary, of the outdoor coil should be done. Cleaning should be as often as necessary to keep the coil clean. Clean any debris and dirt from the outside coil face with a brush being careful not to damage the fins. If extremely dirty, a hose can be used to wash the coil from the inside out while brushing a soapy solution on the outside.
TROUBLESHOOTING
BEFORE CALLING A SERVICE PERSON:
A. B. C. Check thermostat setting and insure thermostat is calling for heat or cooling. Check thermostat for lint, etc. Check fuses or circuit breakers. Check filters for excessive dust accumulation.
REGISTERS
Supply and return air registers must be open when the unit is in operation. Obstructions must not be allowed to block airflow in or out of the registers.
D.
Subject to change without notice. Printed in U.S.A. Copyright 2011 by Johnson Controls, Inc. All rights reserved.