Carrier 59TP6A Installation, Start-up, Operating And Service And Maintenance Instructions

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37operation. Use only AWG No. 18, color--coded, copper thermostatwire.NOTE: Use AWG No. 18 color-coded copper thermostat wire forlengths up to 100 ft. (30 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. 35.ThermostatsA single stage heating and cooling thermostat can be used with thefurnace. The furnace control board CPU will control the furnaceand outdoor unit staging. A two stage heating and coolingthermostat can also be used to control the staging. For two stagethermostat control of the furnace staging, turn SW1-2 ON at thefurnace control board. For two stage thermostat control of a 2-stageoutdoor unit, remove the ACRDJ jumper from the furnace controlboard. Refer to typical thermostat wiring diagrams and theSequence of Operation section for additional details. Consult thethermostat installation instructions for specific information aboutconfiguring the thermostat. See Fig. 35 and 36.Accessories (See Fig. 33 and 35.)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 bloweris 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. See Fig. 33.3. Communication Connector (communication connection)This connection is used when the furnace is controlled byan optional communicating User Interface instead of astandard thermostat. The communication plug is suppliedwith the User Interface. Refer to the instructions suppliedwith the User Interface for complete details. See Fig. 35.4. Outside Air Thermistor (OAT)The OAT connection is used in conjunction with commu-nicating User Interface. It is not required when the furnaceis controlled by a standard type thermostat. Refer to the in-structions supplied with the User Interface for complete de-tails.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.59TP6A