Carrier 58MXA Service And Maintenance Instructions

Also see for GAS FURNACE 58MXA: User's information manual User manual Service and maintenance instructions User's information manual User's information manual

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Carrier 58MXA Service And Maintenance Instructions Manual pdf 4 page image

If filter is installed in furnace blower compartment:1. Turn off electrical supply to furnace.2. Remove main furnace door and blower access panel.3. Release filter retainer wire. (See Fig. 3 or 4.)4. Slide filter out of furnace.5. Furnaces are equipped with permanent, washable filter(s).Clean filter by spraying cold tap water through filter inopposite direction of airflow.6. Rinse filter and let dry. Oiling or coating filter is notrecommended.7. Slide filter into furnace.8. Recapture filter retainer wire.9. Replace blower access panel and main furnace door.10. Turn on electrical supply to furnace.Step 2—Blower Motor and Wheel MaintenanceTo ensure long life, economy, and high efficiency, clean accumu-lated dirt and grease from blower wheel and motor annually.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.The following items should be performed by a qualified servicetechnician.Clean blower motor and wheel as follows:1. Turn off electrical supply to furnace.2. Remove main furnace door and blower access panel.3. Disconnect blower motor wires from furnace control.Field thermostat connections may need to be disconnecteddepending on their length and routing.4. Remove control box mounting screws and position controlbox, transformer, and door switch assembly to right side offurnace casing.5. If condensate trap is located in left- or right-hand side offurnace casing, proceed to item 6, otherwise remove trap andtubing as described below (See Fig. 8, top left):a. Disconnect field drain connection from condensate trap.b. Disconnect drain and relief port tubes from condensatetrap.c. Remove condensate trap from blower shelf.6. Remove screws securing blower assembly to blower shelf andslide blower assembly out of furnace.7. Clean blower wheel and motor by using a vacuum with softbrush attachment. Be careful not to disturb balance weights(clips) on blower wheel vanes. Do not bend wheel or blades asbalance will be affected.8. If greasy residue is present on blower wheel, remove wheelfrom the blower housing and wash it with an appropriatedegreaser. To remove wheel:a. Mark blower wheel location on shaft before disassembly toensure proper reassembly.b. Loosen setscrew holding blower wheel on motor shaft.NOTE: Mark blower mounting arms and blower housing so eacharm is positioned at the same hole location during reassembly.c. Mark blower wheel orientation and cutoff plate location toensure proper reassembly.d. Remove screws securing cutoff plate and remove cutoffplate from housing.e. Remove bolts holding motor mounts to blower housing andslide motor and mounts out of housing. Disconnect capcitorand ground wire attached to blower housing before remov-ing motor. Motor mounts need not be removed from motor.f. Remove blower wheel from housing.UNIT DAMAGE HAZARDFailure to follow this caution may result in noise or furnacecomponent failure.The blower wheel should not be dropped or bent as balancewill be affected.g. Clean wheel per instructions on degreaser cleaner. Do notget degreaser in the motor.9. Reassemble motor and blower wheel by reversing items 8bthrough 8f. Ensure wheel is positioned for proper rotation.Tighten set-screw to 140-160 in.-lb torque.10. Reinstall blower assembly in furnace.11. Reinstall control box, transformer, and door switch assemblyon blower shelf.12. Reinstall condensate trap and tubing if previously removed.a. Reinstall condensate trap in hole in blower shelf.b. Connect condensate trap drain tubes. See Fig. 8 or tubingdiagram on main furnace door for proper tube location.NOTE: Ensure tubes are not kinked or pinched, as this will affectoperation.(1.) Connect 1 tube (blue or blue and white striped) fromcollector box.(2.) Connect 1 tube (violet or unmarked) from inducerhousing.(3.) Connect 1 tube (relief port, green or pink) fromcollector box.c. Connect field drain to condensate trap.13. Reconnect wires.Refer to furnace wiring diagram, and connect thermostat leadsif previously disconnected. (See Fig. 15.)NOTE: Refer to Table 1 for motor speed lead reconnection ifleads were not identified before disconnection.UNIT DAMAGE HAZARDFailure to adjust the heating speed may shorten heat ex-changer life.Heating speed selection MUST be adjusted to provide propertemperature rise as specified on the rating plate. Failure toadjust the heating speed may shorten heat exchanger life.Table 1—Speed SelectionCOLOR SPEED FACTORYATTACHED TOBlack High CoolYellow (When Present) Medium High SpareBlue Medium Low HeatRed Low FanWhite Common Com4→