Carrier 59SC5B Installation, Start-up, Operating And Service And Maintenance Instructions

Also see for 59SC5B: Product data

37Representative drawing only, some models may vary.115-V FIELD-SUPPLIEDDISCONNECTAUXILIARYJ-BOX24-VTERMINALBLOCKTHREE-WIREHEATING-ONLYFIVE WIRENOTE 1NOTE 2FIELD-SUPPLIEDDISCONNECTCONDENSINGUNITTWOWIREFURNACECONTROLRGCOMW C R G YGNDGNDFIELD 24-V WIRINGFIELD 115-, 208/230-, 460-V WIRINGFACTORY 24-V WIRINGFACTORY 115-V WIRING208/230- OR460-VTHREEPHASE208/230-VSINGLEPHASEBLOWER DOOR SWITCHWHTBLKWHTBLKNOTES: Connect Y-terminal in furnace as shown for proper blower operation.Some thermostats require a "C" terminal connection as shown.If any of the original wire, as supplied, must be replaced, usesame type or equivalent wire.WYGNDTHERMOSTATTERMINALS1.2.3.A190079Fig. 36 -- Typical Single--Stage Wiring Diagram24--V WiringMake field 24--v connections at the 24--v terminal strip. See Fig.37. Connect terminal Y as shown in Fig. 36 for proper coolingoperation. Use only AWG No. 18, color--coded, copper thermostatwire.NOTE: Use AWG No. 18 color-coded copper thermostat wire forlengths up to 100 ft. (31 M). For wire lengths over 100 ft., useAWG No. 16 wire.The 24--v circuit contains an automotive--type, 3--amp. fuse locatedon the control. Any direct shorts during installation, service, ormaintenance could cause this fuse to blow. If fuse replacement isrequired, use ONLY a 3--amp. fuse of identical size. See Fig. 37.Accessories (See Fig. 37.)1. Electronic Air Cleaner (EAC)Connect an accessory Electronic Air Cleaner (if used) using1/4--in. female quick connect terminals to the two male1/4--in. quick--connect terminals on the control boardmarked EAC--1 and EAC--2. The terminals are rated for115VAC, 1.0 amps maximum and are energized duringblower motor operation.2. Humidifier (HUM)The HUM terminal is a 24 VAC output, energized when the gasvalve relay is operating during a call for heat.Connect an accessory 24 VAC, 0.5 amp. maximum humidifier (ifused) to the ¼--in. male quick--connect HUM terminal andCOM--24V screw terminal on the control board thermostat strip.NOTE: If the humidifier has its own 24 VAC power supply, anisolation relay may be required. Connect the 24 VAC coil of theisolation relay to the HUM and COM/24V screw terminal on thecontrol board thermostat strip.Alternate Power SuppliesThis furnace is designed to operate on utility generated powerwhich has a smooth sinusoidal waveform. If the furnace is to beoperated on a generator or other alternate power supply, thealternate power supply must produce a smooth sinusoidalwaveform for compatibility with the furnace electronics. Thealternate power supply must generate the same voltage, phase, andfrequency (Hz) as shown in Table 11 or the furnace rating plate.Power from an alternate power supply that is non-sinusoidal maydamage the furnace electronics or cause erratic operation.Contact the alternate power supply manufacturer for specificationsand details.