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 9 page image

With power to the unit disconnected, check all electrical connec-tions for tightness. Tighten all screws on electrical connections. Ifany smoky or burned connections are found, disassemble theconnection, clean all parts, strip wire, and reassemble properly andsecurely.Reconnect electrical supply to unit and observe unit through 1complete operating cycle for proper operation.Step 8—Checking Heat Tape Operation (If Applicable)UNIT AND PROPERTY DAMAGE HAZARDFailure to follow this caution may result in furnace compo-nent failures or water property damage.If this furnace is to be operated in an unconditioned spacewhere the ambient temperatures may be 32°F or lower, freezeprotection measures must be taken. (See Fig. 13.) SeeCONDENSATE DRAIN PROTECTION section of Installa-tion, Start-Up, and Operating Instructions.In applications where the ambient temperature around the furnaceis 32°F or lower, freeze protection measures are required. If heattape has been applied, check to ensure it will operate when lowtemperatures are present.NOTE: Heat tape, when used, should be wrapped around thecondensate drain trap and drain line. There is no need to use heattape within the furnace casing. Most heat tapes are temperatureactivated, and it is not practical to verify the actual heating of thetape. Check the following:1. Check for signs of physical damage to heat tape such as nicks,cuts, abrasions, gnawing by animals, etc.2. Check for discolored heat tape insulation. If any damage ordiscolored insulation is evident, replace heat tape.3. Check that heat tape power supply circuit is on.Step 9—WinterizingUNIT DAMAGE HAZARDFailure to follow this caution may result in furnace compo-nent damage.Freezing condensate left in the furnace will damage theequipment.If the furnace will be off for an extended period of time in astructure where the temperature will drop to 32°F or below,winterize as follows:1. Turn off electrical supply to furnace.2. Remove main furnace door.3. Disconnect cap from unused drain tap on inducer housing.(See Fig. 13.)4. Connect field-supplied 1/2-in. I.D. tube to upper inducerhousing drain connection.UNIT DAMAGE HAZARDFailure of plastic components may occur.Do not use ethylene glycol (Prestone II antifreeze/coolant orequivalent automotive type).5. Insert funnel in tube and pour up to 1 quart antifreeze,propylene glycol (RV, swimming pool antifreeze, or equiva-lent) into funnel until it is visible at point where condensateenters open drain. (See Fig. 14.)6. Reconnect drain cap to inducer housing.7. Replace main furnace door.8. Propylene glycol need not be removed before restartingfurnace.WIRING DIAGRAMSee Fig. 16 for Wiring Diagram.TROUBLESHOOTINGUse the Troubleshooting Guide, the status code LED on thecotntrol and the Component Test to isolate furnace operationproblems.STATUS CODESFor an explanation of status codes, refer to service label located onback of main furnace door or Fig. 17 and the TroubleshootingGuide. The stored status code will NOT be erased from the controlmemory if 115- or 24-v power is interrupted.NOTE: Removing the blower access door will open the bloweraccess door switch and terminate 115-v power to the control.To read current status code, remove main furnace door. The statuscode LED can be viewed through the sight glass on the bloweraccess door.NOTE: NO thermostat signals may be present at control and allblower off delays must be completed to view previous codes.Fig. 10—Gasket on Collector BoxA93081RTVPAM9→→