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(Also see “Electrical Data” on pages 2.) All models are suitable for connection with copper wire only. These instructions must be adhered to. Refer to the National Electrical Code for complete current carrying capacity data on the various insulation grades of wiring material. The electrical specifications on page 2 lists fuse and wire sizes (75° F copper) for all models including the most commonly used heater sizes. The unit rating plate lists a “Maximum Time Delay Fuse” or “HACR” type circuit breaker that is to be used with the equipment. The correct size must be used for proper circuit protection and also to assure that there will be no nuisance tripping due to the momentary high starting current of the compressor. WIRING – 24V LOW VOLTAGE CONTROL CIRCUIT Ten (10 ) wires should be run from thermostat subbase to the 24V terminal board in the unit. A ten conductor, 18 gauge copper, color-coded thermostat cable is recommended. The connection points are shown in Figure 8. FIGURE 8 – LOW VOLTAGE WIRING MIS-1187 TABLE 6 – THERMOSTAT WIRE SIZE Transformer VA FLA Wire Gauge Maximum Length In Feet 55 2.3 20 18 16 14 12 45 60 100 160 250 Manual 2100-344 Page 9 THERMOSTATS See specific wiring information for the different models, heater KWs, and voltages. TABLE 7 HEAT PUMP THERMOSTATS THERMOSTAT SUBBASE DESCRIPTION 8403-045 (T841A1761) Part of Thermostat 1 stage cool, 2 stage heat; Mecury bulb; Manual changeover Em Heat-Heat-Off-CoolSystem Switch:Auto-On;Fan Switch: Check-Em Heat-Aux HeatIndicating Lamps: 8403-017 (T874R1129) 8404-009 Q674L1181 1 stage cool, 2 stage heat; Mercury bulb; Manual changeover Em Heat-Heat-Off-CoolSystem Switch:Auto-On;Fan Switch: Check-Em HeatIndicating Lamps: . 8403-018 (T874N1024) 8404-010 Q674F1261 1 stage cool, 2 stage heat; Mercury bulb; Auto changeover Off-Em Heat-Heat-Auto-CoolSystem Switch:Auto-On;Fan Switch: Check-Em HeatIndicating Lamps: . 8403-042 (T8511G1070) Part of Thermostat 1 stage cool, 2 stage heat; Digital non-programmable (no battery required) Automatic or manual changeover or Cool/HeatOff-Em Heat-AutoSystem Switch:Auto-On;Fan Switch: Em Heat-Aux HeatDisplay Indication:CheckIndicating Lamps: 8403-034 (1F94-80) Part of Thermostat 2 stage cool, 2 stage heat; Digital programmable (7 day); Battery backup Automatic or manual changeover; 1 set-up/set-back period per 24 hours Programmable ventilation terminal for economizer or energy recovery Off-Em Heat-Auto or Cool/HeatSystem Switch:Auto-On;Fan Switch: Emer-Pump-Malf-AuxIndicating Lamps: 8403-027 (1F92-71) Part of Thermostat 2 stage cool, 3 stage heat; Digital proframmable (5day/2day); Battery backup Automatic or manual changeover: 4 set-ups/set-back periods per 24 hours Off-Em Heat-Auto or Cool/HeatSystem Switch:Auto-On;Fan Switch: Emer-Pump-Malf-AuxIndicating Lamps: . No automatic changeover position – must be manually placed in heat or cool. Reversing valve remains energized at all times system switch is in heat position (except during defrost cycle). No pressure equalization noise when thermostat is satisfied on either heating or cooling. Allows thermostat to control both heating and cooling operation when set in “AUTO” position. Reversing valve de- energizes at end of each “ON” heating cycle. Manual 2100-344 Page 10 THERMOSTAT INDICATOR LAMPS The red lamp marked “EM. HT.” comes on and stays on whenever the system switch is placed in Em. Ht. position. The green lamp marked “Check” will come on if there is any problem that prevents the compressor from running when it is supposed to be. EMERGENCY HEAT POSITION The operator of the equipment must manually place the system switch in this position. This is done when there is a known problem with the outdoor section, or when the green “Check” lamp comes on indicating a problem. TRANSFORMER TAPS 230/208V, 1 phase and 3 phase equipment employ dual primary voltage transformers. All equipment leaves the factory wired on 240V tap. For 208V operation, reconnect from 240V to 208V tap. The acceptable operating voltage range for the 240 and 208V taps are: TAP RANGE 240 253 – 216 208 220 – 187 NOTE: The voltage should be measured at the field power connection point in the unit and while the unit is operating at full load (maximum amperage operating condition). COMPRESSOR CUTOFF THERMOSTAT and OUTDOOR THERMOSTAT WIRING Heat pump compressor operation at outdoor temperatures below 0° F are neither desirable nor advantageous in terms of efficiency. Since most equipment at time of manufacture is not designated for any specific destination of the county and most of the equipment is installed in areas not approaching the lower outdoor temperature range, the compressor cutoffs are not factory installed. Outdoor thermostats are available to hold off various banks of electric heat until needed as determined by outdoor temperature. The set point of either type of thermostat is variable with geographic region and sizing of the heating equipment to the structure. Utilization of the Heating Applicati...
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