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

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Carrier 58DLA Installation, Start-up, Operating And Service And Maintenance Instructions Manual pdf 36 page image

36START--UP, ADJUSTMENT, AND SAFETYCHECKGeneralFIRE HAZARDFailure to follow this warning could result in personalinjury, death and/or property damage.This furnace is equipped with manual reset limit switches inthe gas control area. The switches open and shut off powerto the gas valve if a flame rollout or overheating conditionoccurs in the gas control area. DO NOT bypass theswitches. Correct inadequate combustion air supplyproblem before resetting the switches.! WARNINGCUT HAZARDFailure to follow this caution may result in personal injury.Sheet metal parts may have sharp edges or burrs. Use careand wear appropriate protective clothing, safety glasses andgloves when handling parts and servicing furnaces.CAUTION!1. Maintain 115--v wiring and ground. Improper polarity willresult in rapid flashing LED and no furnace operation.2. Make thermostat wire connections at the 24--v terminalblock on the furnace control. Failure to make proper con-nections will result in improper operation. (See Fig. 24 --32.)3. Gas supply pressure to the furnace must be greater than4.5--In. W.C. (0.16 psig ) but not exceed 14--In. W.C. (0.5psig).4. Check all manual--reset switches for continuity.5. Install blower compartment door. Door must be in place tooperate furnace.6. Replace outer door.Start--Up ProceduresFIRE AND EXPLOSION HAZARDFailure to follow this warning could cause personal injury,death and/or property damage.Never test for gas leaks with an open flame. Use acommercially available soap solution made specifically forthe detection of leaks to check all connections.! WARNING1. Purge gas lines after all connections have been made.2. Check gas lines for leaks.ELECTRICAL SHOCK HAZARDFailure to follow this warning could result in personalinjury, or death.Blower access door switch opens 115--v power to control.No component operation can occur unless switch is closed.Caution must be taken when manually closing this switchfor service purposes.! WARNING3. To Begin Component Self--Test:Remove blower access door. Disconnect the thermostat Rlead from the furnace control board. Manually close theblower door switch closed. Short (jumper) the COM--24vterminal on control to the TEST/TWIN 3/16--in. (5 mm)quick connect terminal on control until LED goes out (ap-proximately 2 sec). Gas valve and humidifier will not beturned on. (See Fig. 24.)NOTE: The furnace control allows all components, except thegas valve, to be run for short period of time. This feature helpsdiagnose a system problem in case of a component failure.Component test feature will not operate if any thermostat signal ispresent at the control.Component test sequence is as follows:Refer to service label attached to furnace or see Fig. 50.a. LED will display previous status code 4 times.b. Inducer motor starts and continues to run until Step f ofcomponent test sequence.c. Hot surface igniter is energized for 15 sec., then off.d. Blower motor operates on HEAT speed for 10 sec.e. Blower motor operates on COOL speed for 10 sec.f. Inducer motor stops.g. Reconnect R lead to furnace control board, release blowerdoor switch and re--install blower door.4. Operate furnace per instruction on door.5. Verify furnace shut down by lowering thermostat settingbelow room temperature.6. Verify furnace restarts by raising thermostat setting aboveroom temperature.AdjustmentsFIRE HAZARDFailure to follow this warning could result in injury, deathand/or property damage.DO NOT bottom out gas valve regulator adjusting screw.This can result in unregulated manifold pressure and result inexcess overfire and heat exchanger failures.! WARNINGFURNACE DAMAGE HAZARDFailure to follow this caution may result in reduced furnacelife.DO NOT redrill orifices. Improper drilling (burrs,out--of--round holes, etc.) can cause excessive burner noiseand misdirection of burner flames. This can result in flameimpingement of heat exchangers, causing failures. (See Fig.48.)CAUTION!Furnace gas input rate on rating plate is for installations ataltitudes up to 2000 ft. (610 M). Furnace input rate must bewithin +/--2 percent of furnace rating plate input. For altitudesabove 5500 ft. (1676 M), a field--supplied high altitude pressureswitch is required.1. Determine the correct gas input rate.The input rating for altitudes above 2,000 ft. (610 M) mustbe reduced by 4 percent for each 1,000 ft. (305 M) abovesea level. For installations below 2000 ft. (610 M), refer tothe unit rating plate. For installations above 2000 ft. (610M), multiply the input on the rating plate by the de--rate58DL