Carrier 58MCB Installation, Start-up, And Operating Instructions Manual

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

Carrier 58MCB Installation, Start-up, And Operating Instructions Manual Manual pdf 44 page image

NOTE: Record the status code BEFORE opening the bloweraccess door and before shutting off power to the furnace. Openingthe blower access door will open the blower door switch and shutoff power within the furnace. When power to the furnace is shutoff by either method, the status code will be lost because the codeis not stored while power is removed for any reason.To Begin Component Self-Test:ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in electrical shock,personal injury, or death.Blower access panel door switch opens 115-v power tocontrol center. No component operation can occur. Cautionmust be taken when manually closing this switch for servicepurposes.1. Remove blower access door.2. Disconnect the thermostat R lead from furnace control.3. Manually close blower door switch.4. For approximately 2 sec, short (jumper) the C OM-24v terminalon control to the TEST/TWIN 3/16-inch quick-connect termi-nal on control until the LED goes out. Remove jumper fromterminals. (See Fig. 34.)NOTE: If TEST/TWIN and COM-24v terminals are jumperedlonger than 2 sec, LED will flash rapidly and ignore componenttest request.Component test sequence is as follows:a. LED will display previous status code 4 times.b. Inducer motor starts and continues to run until Step g ofcomponent test sequence.c. After 7 seconds the hot surface igniter is energized for 15sec., then off.d. Blower motor operates on Continuous-FAN speed for 10sec.e. Blower motor operates on HEAT speed for 10 sec.f. Blower motor operates on COOL speed for 10 sec.g. Inducer motor stops.5. Reconnect R lead to furnace control, remove tape from blowerdoor switch, and re-install blower door.6. Operate furnace per instruction on outer door.7. Verify furnace shut down by lowering thermostat settingbelow room temperature.8. Verify that furnace restarts by raising thermostat setting aboveroom temperature.Step 5—AdjustmentsSET GAS INPUT RATEFurnace gas input rate on rating plate is for installations at altitudesup to 2000 ft.In the U.S.A., the input ratings for altitudes above 2000 ft must bereduced by 2 percent for each 1000 ft above sea level.In Canada, the input ratings must be derated by 5 percent foraltitudes of 2000 ft to 4500 ft above sea level.Furnace input rate must be within ±2 percent of input on furnacerating plate adjusted for altitude.1. Determine natural gas orifice size and manifold pressure forcorrect input.a. Obtain average yearly gas heat value (at installed altitude)from local gas supplier.b. Obtain average yearly gas specific gravity from local gassupplier.A99118Fig. 44—Inducer Housing Drain CapA99119Fig. 45—Filling Condensate Trap44