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Honeywell T874G manual

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Table of contents for the manual

  • Page 1

    X-XX UL INST ALLA TION INSTRUCTIONS Copyright © 1995 Honeywell Inc. • • All Rights Reserved T874G,R Multistage Heat Pump Thermostats and Q674F ,J,L Subbases APPLICA TION The T874G,R Thermostats with Q674F,J,L Subbases provide 24 to 30 Vac control of a two-stage heating/one- stage cooling heat pump system. See Table 1 for thermostat/subbase spe[...]

  • Page 2

    69-0268—1 1 2 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES CA UTION 1. Disconnect power supply to prevent electrical shock or equipment damage. 2. Run wires as close as possible to the subbase. To prevent interference with the thermostat linkage, keep wire length to a minimum. Push excess wire back into the hole and plug the ho[...]

  • Page 3

    69-0268—1 1 3 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES H1 FALL RISE CO L1 (HOT) L2 1 3 C1 RISE 1 2 2 3 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. TERMINAL LABELED C/X ON SOME MODELS. W3 TERMINAL ON SOME MODELS ONLY. C1 ANTICIPATOR H1 ANTICIPATOR FAN SWITCH AUTO ON SYSTEM SWITCH AUTO HEAT OFF[...]

  • Page 4

    69-0268—1 1 4 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES H1 FALL H2 FALL CO RISE C1 RISE L1 (HOT) L2 1 2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE JUMPER FOR INDEPENDENT CONTROL OF W1 AND E TERMINALS. THERMOSTAT SUBBASE SYSTEM COMPONENTS H1 ANTICIPATOR H2 ANTICIPATOR C1 ANTICIPATOR[...]

  • Page 5

    69-0268—1 1 5 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES H2 FALL H1 FALL C1 L1 (HOT) L2 1 2 2 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. FACTORY-INSTALLED JUMPER. THERMOSTAT SUBBASE SYSTEM COMPONENTS H1/C1 ANTICIPATOR H2 ANTICIPATOR SYSTEM SWITCH FAN SWITCH AUTO ON OFF HEAT EM. HT. COOL FAN [...]

  • Page 6

    69-0268—1 1 6 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES H2 FALL H1 FALL C1 L1 (HOT) L2 1 1 2 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE JUMPER FOR INDEPENDENT CONTROL OF W1 AND E TERMINALS. THERMOSTAT SUBBASE SYSTEM COMPONENTS H1/C1 ANTICIPATOR H2 ANTICIPATOR RESET SYSTEM SWITCH FAN [...]

  • Page 7

    69-0268—1 1 7 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES 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 ANTI[...]

  • Page 8

    69-0268—1 1 8 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES 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. HEAT [...]

  • Page 9

    69-0268—1 1 9 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES Fig. 10. Internal schematic and typical wiring diagram for T874R/Q674L in heat pump system. Includes EM. HT. and AUX. HT. LEDs. 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 C[...]

  • Page 10

    69-0268—1 1 10 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES M1627A R W E X L1 (HOT) L2 COOL EM. HT. HEAT SYSTEM SWITCH AUTO ON FAN SWITCH 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. REMOVE JUMPER FOR INDEPENDENT CONTROL OF W AND E TERMINALS. 1 AUXILIARY HEAT LED (YELLOW) C T COMPRESSOR CONTACTO[...]

  • Page 11

    69-0268—1 1 11 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES THERMOSTAT MOUNTING POST (2) M3266 50 60 70 80 HEAT THERMOSTAT MOUNTING SLOTS (2) SUBBASE THERMOSTAT CAPTIVE MOUNTING SCREWS (2) Fig. 14. Mounting thermostat on subbase. SETTING T emperature Setting The T874R has one setpoint lever that controls both heating and coolin[...]

  • Page 12

    69-0268—1 1 12 T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES Home and Building Control Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 69-0268—1 1 J.S. Rev . 12-95 If the setpoint lever setting and the thermometer reading do not agree, follow the procedure below. 쐃 Remove thermostat cover b[...]