ICP G9MVE0401410A2 Service And Technical Support Manual

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ICP G9MVE0401410A2 Service And Technical Support Manual Manual pdf 21 page image

SERVICE AND TECHNICAL SUPPORT MANUAL Gas Furnace: (F/G)9MVESpecifications subject to change without notice.440 04 4801 00 2112. Spin the blower wheel by hand to verify that the wheeldoes not rub on the housing.13. Reinstall blower assembly in furnace.14. Reinstall 2 screws securing blower assembly to blowerdeck.15. Reconnect blower leads to furnace control. Refer tofurnace wiring diagram, and connect thermostat leads ifpreviously disconnected.NOTE: Be sure to attach ground wire and reconnect blowerharness plugs to blower motor.ELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personalinjury or death.Blower door switch opens 115−v power to control. Nocomponent operation can occur unless switch is closed.Caution must be taken when manually closing thisswitch for service purposes.! WARNING16. Downflow or horizontal furnaces with vent pipe throughfurnace only:a. Install and connect short piece of vent pipe insidefurnace to existing vent.b. Connect vent connector to vent elbow.17. Turn on electrical supply. Manually close blower doorswitch. Use a piece of tape to hold switch closed. Checkfor proper rotation and speed changes between heatingand cooling by jumpering R to G and R to Y/Y2 onfurnace control thermostat terminals. If outdoortemperature is below 70F (21C), turn off circuit breakerto outdoor unit before running furnace in the coolingcycle. Turn outdoor circuit breaker on after completingcooling cycle. (See Figure 4)NOTE: If R−W/W1 thermostat terminals are jumpered at thetime blower door switch is closed, blower will run for 90 secbefore beginning a heating cycle.a. Perform component self−test as shown at the bottomof the SERVICE label, located on the control door.b. Verify blower is rotating in the correct direction18. If furnace is operating properly, RELEASE BLOWERDOOR SWITCH. Remove any jumpers or reconnect anydisconnected thermostat leads. Replace blower door.19. Turn on gas supply and cycle furnace through onecomplete heating cycle. Verify the furnace temperaturerise as shown in Adjustments Section. Adjusttemperature rise as shown in Adjustments Section.Cleaning Burners and Flame SensorThe following items must be performed by a qualified servicetechnician. If the burners develop an accumulation of light dirtor dust, they may be cleaned by using the following procedure:NOTE: Use a back-up wrench on the gas valve to prevent thevalve from rotating on the manifold or damaging the mountingto the burner assembly.ELECTRICAL SHOCK AND FIRE HAZARDFailure to follow this warning could result in personalinjury, death, and/or property damage.Turn off the gas and electrical supplies to the furnaceand install lockout tag before performing anymaintenance or service. Follow the operatinginstructions on the label attached to the furnace.! WARNINGRefer to Figure 10.1. Disconnect power at external disconnect, fuse or circuitbreaker.2. Turn off gas at external shut-off or gas meter.3. Remove control door and set aside.4. Turn electric switch on gas valve to OFF.5. Disconnect the gas pipe from gas valve and remove pipefrom the furnace casing.6. Remove individual wires from terminals on gas valve (Allother models).7. Disconnect Hot Surface Igniter (HSI) wires from HSI.8. Disconnect Flame Sensor wire from Flame Sensor.9. Support the manifold and remove the 4 screws thatsecure the manifold assembly to the burner assemblyand set aside. Note the location of the green/yellow wireand ground terminal.10. Inspect the orifices in the manifold assembly forblockages or obstructions. Remove orifice and clean orreplace orifice.11. Remove the four screws that attach the top plate of thecasing to the furnace.12. Raise top plate up slightly and prop it up with a smallpiece of wood or folded cardboard.13. Support the burner assembly and remove the screwsthat attach the burner assembly to the heat exchangercell panel.14. Remove wires from both rollout switches.15. Slide one−piece burner out of slots on sides of burnerassembly.16. Remove the flame sensor from the burner assembly.17. (Optional) Remove the Hot Surface Igniter (HSI) andbracket from the burner assembly.18. Check igniter resistance. Nominal resistance is 40 to 70ohms at room temperature and is stable over the life ofthe igniter.19. Clean burner with a brush and a vacuum.20. Clean the flame sensor with fine steel wool (0000 grade).Do not use sand paper or emery cloth.To reinstall burner assembly:1. Install the Hot Surface Igniter (HSI) and bracket in burnerassembly.2. Install flame sensor on burner.