Carrier 58CVA Installation, Start-up, Operating And Service And Maintenance Instructions

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Carrier 58CVA Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 41 page image

The inducer and blower motors are pre-lubricated and require noadditional lubrication. These motors can be identified by theabsence of oil ports on each end of the motor.Clean blower motor and wheel as follows:1. Turn off electrical supply to furnace.2. Loosen the thumbscrew on outer door and then remove outerdoor.3. For downflow or horizontal furnaces having vent pipes withinthe furnace that pass in front of the blower access door:a. Disconnect vent connector from furnace vent elbow.b. Disconnect and remove short piece of vent pipe fromwithin furnace.4. Remove 2 screws from blower access door and remove bloweraccess door.5. Disconnect blower leads from furnace control. Notice wirecolor and location for reassembly. All other factory wires canbe left connected, but field thermostat connections may needto be disconnected depending on their length and routing.6. Remove 2 screws from control box to blower shelf.7. Hang control box from front of furnace casing and away fromblower compartment.8. Remove 2 screws holding blower assembly to blower deckand slide blower assembly out of furnace.9. Clean blower wheel and motor using a vacuum with soft brushattachment. Blower wheel blades may be cleaned with a smallpaint or flux brush. Do not remove or disturb balance weights(clips) on blower wheel blades.10. Vacuum any loose dust from blower housing, wheel andmotor.11. If a greasy residue is present on blower wheel, remove wheelfrom the blower housing and wash it with an appropriatedegreaser. To remove wheel:NOTE: Before disassembly, mark blower mounting arms, motor,and blower housing so motor and each arm is positioned at thesame location during reassembly.a. Disconnect ground wire attached to blower housing.b. Remove screws securing cutoff plate and remove cutoffplate from housing.c. Loosen set screw holding blower wheel on motor shaft.d. Remove bolts holding motor to blower housing and slidemotor out of wheel.e. Remove blower wheel from housing.f. Clean wheel and housing.12. Reassemble motor and blower by reversing steps 11e, through11a. Be sure to reattach ground wire to the blower housing.13. Verify that blower wheel is centered in blower housing and setscrew contacts the flat portion of the motor shaft. Loosen setscrew on blower wheel and reposition if necessary.14. Spin the blower wheel by hand to verify that the wheel doesnot rub on the housing.15. Reinstall blower assembly in furnace.16. Reinstall control box assembly in furnace.NOTE: Refer to Fig. 51 if leads were not identified beforedisconnection.17. Reconnect blower leads to furnace control. Refer to furnacewiring diagram, and connect thermostat leads if previouslydisconnected.18. To check blower for proper rotation:a. Turn on electrical supply.Blower access door switch opens 115-v power to furnacecontrol. No component operation can occur. Caution must betaken when manually closing this switch for service purposes.Failure to follow this warning could result in electrical shock,personal injury, or death.b. Manually close blower access door switch.NOTE: If R-W/W1 thermostat terminals are jumpered at the timeblower access door switch is closed, blower will run for 90 secbefore beginning a heating cycle.c. Perform component self-test as shown at the bottom of theSERVICE label, located on the front of blower access door.d. Verify blower is rotating in the correct direction19. If furnace is operating properly, RELEASE BLOWER AC-CESS DOOR SWITCH, then replace blower access door.Remove any jumpers or reconnect any disconnected thermo-stat leads.20. 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.21. Turn on gas supply and cycle furnace through one completeheating and cooling cycle. Verify the unit temperature rise asshown in Adjustments Section. Adjust temperature rise asshown in Adjustments Section. If outdoor temperature isbelow 70° F, turn off circuit breaker to outdoor unit beforerunning furnace in the cooling cycle. Turn outdoor circuitbreaker on after completing cooling cycle.CLEANING HEAT EXCHANGERThe following steps should be performed by a qualified servicetechnician:NOTE: If the heat exchangers get a heavy accumulation of sootand carbon, they should be replaced rather than trying to cleanthem thoroughly. A build-up of soot and carbon indicates that aproblem exists which needs to be corrected, such as improperadjustment of manifold pressure, insufficient or poor qualitycombustion air, incorrect size or damaged manifold orifice(s),improper gas, or a restricted heat exchanger. Action must be takento correct the problem.If it becomes necessary to clean the heat exchangers because ofdust or corrosion, proceed as follows:1. Turn OFF gas and electrical power to furnace.2. Remove outer access door.3. Disconnect vent connector from furnace vent elbow.4. For downflow or horizontal furnace having an internal ventpipe, remove internal vent pipe within the casing.5. Disconnect wires to the following components. Mark wires toaid in reconnection(be careful when disconnecting switchesbecause damage may occur):a. Draft safeguard switch.b. Inducer motor.c. Pressure switches.d. Limit overtemperature switch.e. Gas valve.f. Hot surface igniter.40