Carrier 58MCB Service And Maintenance Instructions

Also see for 58MCB: User's information manual Owner's manual Service and maintenance instruction Nstallation, start-up, and operating instructions Installation, start-up, and operating instructions

Contents

Carrier 58MCB Service And Maintenance Instructions Manual pdf 13 page image

13UNIT AND PROPERTY DAMAGEFailure to follow this caution may result in furnacecomponent failures or water property damage.Operating a unit without a filter or with the blower accessdoor removed could cause damage to the furnace blowermotor. Dust and lint on internal parts of furnace can cause aloss of efficiency. If this furnace is to be operated in anunconditioned space where the ambient temperatures maybe 32_F (0_C)or lower, freeze protection measures must betaken. See CONDENSATE DRAIN PROTECTION sectionof Installation, Start--up, and Operating Instructions. (SeeFig. 17.)CAUTION!Step 9 — WinterizingUNIT DAMAGE HAZARDFailure to follow this caution may result in furnacecomponent damage.Freezing condensate left in the furnace may damage thefurnace.CAUTION!If the furnace will be off for an extended period of time in astructure where the temperature will drop to 32_F (0_C)or below,winterize as follows:1. Turn off electrical supply to furnace.2. Remove main furnace door.3. Disconnect upper inducer housing drain connection capfrom inducer housing. (See Fig. 18.)4. Connect field--supplied 1/2--in. I.D. inducer housing tube toupper inducer housing drain connection.5. Insert funnel in tube and pour one quart of antifreeze, pro-pylene glycol (RV, swimming pool antifreeze, or equival-ent) into funnel/tube until it is visible at point where con-densate enters open drain. (See Fig. 19.)UNIT DAMAGE HAZARDFailure to follow this caution may result in unit componentdamage.Do not use ethylene glycol (Prestone II antifreeze/coolant orequivalent automotive type).CAUTION!6. Replace drain connection cap and clamp to inducer housing.7. Replace main furnace door.8. Propylene glycol need not be removed before restarting fur-nace.A07911Fig. 17 -- Freeze ProtectionWIRING DIAGRAMSSee Fig. 21 for wiring diagram.TROUBLESHOOTINGUse the troubleshooting guide, the status code LED on the furnacecontrol 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. 20.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.UNIT DAMAGE HAZARDFailure to follow this caution may result in damage to unitcomponents.Make sure limit switch or flame rollout switch wire doesnot contact any metal component, such as gas valve. If wireis shorted, 3--amp fuse on furnace control board will openand unit will not operate.CAUTION!To retrieve previous codes, remove one of the red main limit orflame rollout switch wires for 1 to 4 sec until the LED light goesout, then reconnect it. (Do not leave red wire disconnected forlonger periods of time as the control will assume anovertemperature condition exists and will respond with bloweroperation.) This places the control in the status recall mode anddisplays the last code stored in memory.Record the code. After the last code is displayed the control willperform the component test, and then return to normal standbymode.58MCB