69-0392—9
11
T874R THERMOSTATS AND Q674L SUBBASES
Page 1: ... AUX HT EM HT CHECK Manual Heat or Cool SUPER TRADELINE fixed heat anticipation Factory installed jumper across W1 and Y1 Auto fan in EM HT 8 Y594R1615 T874R1822 Q674L1710 AUX HT EM HT CHECK Manual Heat or Cool TRADELINE fixed heat anticipation Auto fan in EM HT 10 Y594R1664 T874R1871 Q674L1736 EM HT Manual Cool TRADELINE exact replacement for York model no 2TH11702224 9 Y594R1672 T874R1889 Q674L1...
Page 2: ...e check out product operation as provided in these instructions CAUTION 1 Disconnect power supply to prevent electrical shock or equipment damage 2 To prevent interference with the thermostat linkage keep wire length to a minimum and run wires as close as possible to the subbase 3 Push excess wire back into the hole and plug hole to prevent drafts from affecting thermo stat operation 4 Do not over...
Page 3: ...l adjustments IMPORTANT An incorrectly leveled subbase causes the temperature control to deviate from setpoint Wiring the Subbase All wiring must comply with local electrical codes and ordinances Follow equipment manufacturer wiring instructions when available To wire subbase proceed as follows 1 Connect the system wires to the subbase See Fig 5 12 A letter code for identification is located near ...
Page 4: ...L POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED FIELD REMOVABLE JUMPER 1 2 2 M2970 THERMOSTAT SUBBASE SYSTEM COMPONENTS M5072A HOT L1 L2 1 LACO CHP Y B E O G L X W2 W3 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD SYSTEM MONITOR FAN RELAY COMPRESSOR CONTACTOR COOL CHANGEOVER VALVE EM HT RELAY RTD 1 AUX HT LED GREEN EM HT LED RED FAN SWITCH ON AUTO SYSTEM SWITCH EM HT H...
Page 5: ...TO ON SYSTEM SWITCH EM HT HEAT OFF COOL EM HT LED RED AUX HT LED GREEN M1030A H1 FALL C L1 HOT L2 1 EM HT LED RED AUX HT LED GRN W3 O L G R W2 E X X2 B W1 Y AUX HT RELAY EM HT RELAY HEAT CHANGEOVER VALVE W1 RELAY COMPRESSOR RELAY W3 RELAY COOL CHANGEOVER VALVE COMPRESSOR MONITOR FAN RELAY H2 FALL H1 ANTICIPATOR C ANTICIPATOR H2 ANTICIPATOR POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECT...
Page 6: ... DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M3173A THERMOSTAT SUBBASE SYSTEM COMPONENTS 1 H2 FALL H1 FALL C L1 HOT L2 1 1 POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED THERMOSTAT SUBBASE SYSTEM COMPONENTS M5068 H1 ANTICIPATOR C ANTICIPATOR H2 ANTICIPATOR 11 6 5 4 3 2 1 FAN SWITCH AUTO ON SYSTEM SWITCH EM HT HEAT OFF COOL AUX HT LED GREEN EM HT LED RED Y B X E ...
Page 7: ...TOR RESET HEATER POWER SUPPLY PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED M3173A THERMOSTAT SUBBASE SYSTEM COMPONENTS 1 L1 HOT L2 1 X L W2 EM HT LED RED AUX HT LED GRN AUX HT RELAY FAN RELAY B RELAY G COOL CHANGEOVER VALVE EM HT RELAY COMPRESSOR CONTACTOR O Y E B SYSTEM SWITCH EM HT HEAT OFF COOL H1 C1 ANTICIPATOR C1 H1 FALL H2 W3 AUX HT RELAY H2 ANTICIPATOR 1 2 3 2 3 POWER SUPPLY...
Page 8: ...ol nameplate has no rating or if further adjustment is necessary use the following procedure to determine the current draw Measure the current draw with the thermo stat removed and the power on 1 Connect an ac ammeter of appropriate range between the heating terminals of the subbase Stage 2 between W2 and R 2 Move the system switch to HEAT 3 After one minute read the ammeter and record the reading...
Page 9: ...ctric strip heater should de energize The EM HT LED remains on until system switch is moved to another position Fan Move the subbase system switch to OFF and the fan switch to ON The fan should run continuously When the fan switch is in the AUTO position fan operation is con trolled by the heating or cooling system CALIBRATION Thermostat T874 Thermostats are accurately calibrated at the factory Th...
Page 10: ...69 0392 9 10 T874R THERMOSTATS AND Q674L SUBBASES ...
Page 11: ...69 0392 9 11 T874R THERMOSTATS AND Q674L SUBBASES ...
Page 12: ...BASES 69 0392 9 G H Rev 10 97 www honeywell com yourhome Automation and Control Solutions Honeywell International Inc Honeywell Limited Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley MN 55422 Scarborough Ontario M1V 4Z9 ...
