Carrier 59SC2C Series Installation, Start-up, Operating And Service And Maintenance Instructions

Also see for 59SC2B: Product data

7611. Verify that blower wheel is centered in blower housing andset screw contacts the flat portion of the motor shaft. Loosenset screw on blower wheel and reposition if necessary.12. Spin the blower wheel by hand to verify that the wheel doesnot 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 to furnacewiring diagram, and connect thermostat leads if previouslydisconnected.NOTE: Be sure to attach ground wire and reconnect blowerharness plugs to blower motor.ELECTRICAL OPERATION HAZARDFailure to follow this warning could result in personal injuryor 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 this switch forservice purposes.! WARNING16. Downflow or horizontal furnaces with vent pipe throughfurnace only:a. Install and connect short piece of vent pipe inside furnaceto 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. Check forproper rotation and speed changes between heating andcooling by jumpering R to G and R to Y/Y2 on furnacecontrol thermostat terminals. If outdoor temperature is be-low 70_F (21_C), turn off circuit breaker to outdoor unitbefore running furnace in the cooling cycle. Turn outdoorcircuit breaker on after completing cooling cycle. See Fig.38.NOTE: If R--W/W1 thermostat terminals are jumpered at the timeblower door switch is closed, blower will run for 90 sec beforebeginning a heating cycle.a. Perform component self--test as shown at the bottom of theSERVICE 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 one completeheating cycle. Verify the furnace temperature rise as shownin Adjustments Section. Adjust temperature rise as shown inAdjustments Section.Cleaning Burners and Flame SensorThe following items must be performed by a qualified servicetechnician. If the burners develop an accumulation of light dirt ordust, 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 mounting tothe burner assembly.ELECTRICAL SHOCK AND FIRE HAZARDFailure to follow this warning could result in personal injury,death, and/or property damage.Turn off the gas and electrical supplies to the furnace andinstall lockout tag before performing any maintenance orservice. Follow the operating instructions on the labelattached to the furnace.! WARNINGRefer to Fig. 68.1. 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.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 that securethe manifold assembly to the burner assembly and set aside.Note the location of the green/yellow wire and ground ter-minal.10. Inspect the orifices in the manifold assembly for blockagesor obstructions. Remove orifice and clean or replace orifice.11. Remove the four screws that attach the top plate of the cas-ing to the furnace.12. Raise top plate up slightly and prop it up with a small pieceof wood or folded cardboard.13. Support the burner assembly and remove the screws that at-tach the burner assembly to the heat exchanger cell panel.14. Remove wires from both rollout switches.15. Slide one--piece burner out of slots on sides of burner as-sembly.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 of theigniter.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.3. Align the edges of the one-piece burner with the slots in theburner assembly and slide the burners forward until they arefully seated in the burner assembly.4. Align the orifices in the manifold assembly with the supportrings on the end of the burner.5. Insert the orifices in the support rings of the burners.NOTE: If manifold does not fit flush against the burner, do notforce the manifold on the burner assembly. The burners are notfully seated forward in the burner assembly. Remove the manifoldand check burner positioning in the burner assembly assemblybefore re-installing the manifold.6. Attach the green/yellow wire and ground terminal to one ofthe manifold mounting screws.59SC2C