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A97374 IMPORTANT: When using outdoor thermostat, W2 must be energized when requesting supplemental heat. FA, FB, FC, TWO OTHER FD, FF, FH HEAT OUTDOOR HP THERMOSTAT FAN COIL PUMP THERMOSTATS OTHER FK4C HEAT HP THERMOSTAT FAN COILPUMP 24 VAC HOT 24 VAC COM HEAT STAGE 2 COOL/HEAT STAGE 1 INDOOR FAN RVS COOLING EMERGENCY HEAT R C W2 Y G R W3 W2 G E W2 C O R C O Y E ODT ODT EHR EHR EHR * * * 24 VAC HOT R C W2 Y G R DH C RVS COOLING C W2 G Y/Y2 O Y1 O E W1 W2 R Y 24 VAC COM HEAT STAGE 2 COOL/HEAT STAGE 1 INDOOR FAN EMERGENCY HEAT O J1 JUMPER J2 JUMPER * IF AVAILABLE NOTE: Remove wires from crimp nut in indoor fan coil when installing outdoor thermostats. IMPORTANT: When using outdoor thermostats, W2 must be energized when requesting supplemental heat. Fig. 9—Typical 24v Circuit Connections using Other HP Thermostats with Fan Coils and No Outdoor T —6— CAUTION: To prevent personal injury wear safety glasses, protective clothing, and gloves when handling refrigerant and observe the following: •Back-seating service valves are not equipped with Schrader valves. Fully back seat (counterclockwise) valve stem before removing gage-port cap. •Front-seating service valves are equipped with Schrader valves. A97413 LEGEND 24-V FACTORY WIRING 24-V FIELD WIRING FIELD SPLICE CONNECTION OUTDOOR THERMOSTAT EMERGENCY HEAT RELAY SUPPLEMENTAL HEAT RELAYSHR EHR ODT are equipped with a phase monitor to detect if the incoming power is correctly phased for compressor operation. (See Fig. 10 and Table 3.) If the phasing is correct, circuit R-Y energizes contactor, starting outdoor fan motor and compressor circuit. R-G energizes indoor unit blower relay, starting indoor blower motor on high speed. NOTE: If the phasing is incorrect, the contactor will not be energized. To correct the phasing, interchange any two of the three power connections on the field side. When thermostat is satisfied, its contacts open, de-energizing the contactor and blower relay. Compressor and motors should stop. NOTE: If indoor unit is equipped with a time-delay relay circuit, the blower runs an additional 90 sec to increase system efficiency. HEATING On a call for heating, thermostat makes circuits R-Y and R-G. If phasing is correct, circuit R-Y energizes contactor, starting outdoor fan motor and compressor. Circuit R-G energizes indoor blower relay, starting blower motor on high speed. Should temperature continue to fall, R-W2 is made through second-stage room thermostat bulb. Circuit R-W2 energizes a sequencer, bringing on first bank of supplemental electric heat and providing electrical potential to second heater sequencer (if used). If outdoor temperature falls below setting of outdoor thermostat (field-installed option), contacts close to complete circuit and bring on second bank of supplemental electric heat. When thermostat is satisfied, its contacts open, de-energizing contactor and sequencer. All heaters and motors should stop. CAUTION: Do not vent refrigerant to atmosphere. Recover during system repair or final unit disposal. 1. Fully back seat (open) liquid-and vapor-tube service valves. 2. Unit is shipped with valve stem(s) front seated (closed) and caps installed. Replace stem caps after system is opened to refrigerant flow. Replace caps finger-tight and tighten with wrench an additional 1/12 turn. 3. Close electrical disconnects to energize system. 4. Set room thermostat to desired temperature. Be sure set point is below indoor-ambient temperature. 5. Set room thermostat to HEAT or COOL and fan control to ON or AUTO mode, as desired. Operate unit for 15 minutes. Check system-refrigerant charge. CAUTION: • 3-phase scroll compressors are rotation sensitive. • A flashing LED on phase monitor indicates reverse rotation. (See Fig. 10 and Table 3.) • This will not allow contactor to be energized. • Disconnect power to unit and interchange 2 field wiring leads on unit contactor. A. Sequence of Operation l . With power supplied to indoor and outdoor units, transformer is energized. COOLING On a call for cooling, thermostat makes circuits R-O, R-Y, and R-G. Circuit R-O energizes reversing valve, switching it to cooling position. On three phase models with scroll compressors, the units A00010 Fig. 10—Phase Monitor Control DEFROST The defrost control is a time/temperature control which includes a field-selectable (quick-connects located at board edge) time period between defrost cycles (30, 50, or 90 minutes), factory set at 90 minutes. The electronic timer and defrost cycle start only when contactor energized and defrost thermostat is closed. Defrost mode is identical to cooling mode except that outdoor fan motor stops and second-stage heat is turned on to continue warming conditioned space. To initiate defrost, the defrost thermostat must be closed. This can be accomplished as follows: 1. Turn off power to outdoor unit. 2. Disconnect outdoor fan motor lead from OF2 on control board. (See Fig. 11.) Tape lead to prevent grounding. —7— 3. Restart unit in heat...
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