Honeywell T874/Q674 manual

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Table of contents for the manual

  • Page 1

    S . M. • Rev. 5-93 • • ©Honeywell Inc. 1993 • Form Number 60-1147—4 T874/Q674 Thermostat/Subbase Combinations Installation Instructions for the Trained Service Technician. Application The T874/Q674 Thermostat/Subbase combinations provide 24 to 30 Vac control for heat pump systems. See Table 1. TABLE 1—T874/Q674 THERMOSTAT/SUBBASE COMBI[...]

  • Page 2

    60-1 147-4 2 Fig. 1—Installation of Q674 Subbase on outlet box. M925 VERTICAL OUTLET BOX ADAPTER RING SUBBASE COVER PLATE MOUNTING SCREWS (2) MOUNTING SCREWS (2) 1 SUBBASE MOUNTING SCREWS (2) HORIZONTAL OUTLET BOX 1 2 2 1 NOT INCLUDED WITH UNIT. 2 ACCESSORY PARTS AVAILABLE (193121A). Fig. 2—Installation of Q674 Subbase on wall. WIRES THROUGH WA[...]

  • Page 3

    60-1 147-4 3 Fig. 4—Wiring connections. 2. Carefully remove and discard the polystyrene packing insert that protects the mercury switches during shipment. 3. If LED indication (EM.HT., CHECK, etc.) is to be used with the Q674 Subbase, install the preprinted insert under the thermostat set point scale (Fig. 8). To install, push both thermostat set[...]

  • Page 4

    60-1 147-4 4 Fig. 6—Internal schematic and typical wiring diagram for T874N and Q674F. L1 HOT L2 1 W1 W2 EM. HEAT LED (RED) CHECK LED (GREEN) FAN RELAY G EM. HEAT RELAY COMPRESSOR CONTACTOR Y E SYSTEM SWITCH EM. HT. HEAT OFF COOL H1 ANTICIPATOR H1 H2 H2 ANTICIPATOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M368[...]

  • Page 5

    60-1 147-4 5 Fig. 7—Internal schematic and typical wiring diagram for T874R and Q674L. L1 HOT L2 1 X2 W2 EM. HEAT LED (RED) AUX. HEAT LED (GREEN) HIGH LIMIT SWITCH FAN RELAY G EM. HEAT RELAY COMPRESSOR CONTACTOR Y E SYSTEM SWITCH EM. HT. HEAT OFF COOL H1/C1 ANTICIPATOR H1 H2 H2 ANTICIPATOR 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PRO[...]

  • Page 6

    60-1 147-4 6 Fig. 9—Mounting thermostat on subbase. THERMOSTAT MOUNTING POST (2) M936 50 60 70 80 50 60 70 80 HEAT COOL THERMOSTAT MOUNTING SLOTS (2) SUBBASE THERMOSTAT CAPTIVE MOUNTING SCREWS (2) Settings HEAT ANTICIPATOR SETTING Set the adjustable heat anticipator to match the current draw of the second stage heating primary control (Fig. 10). [...]

  • Page 7

    60-1 147-4 7 Checkout HEATING Move the system switch on the Q674 to HEAT or AUTO (if used) and the fan switch to AUTO. Move the heating set point lever on the T874 about 10 ° F [6 ° C] above room temperature. Heating equipment should start and the fan should run. Move the heat lever about 10 ° F [6 ° C] below room temperature. The heating equip[...]

  • Page 8

    60-1 147-4 8 Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 60-1 147 –4 S.M. Rev . 5-93 Automation and Control Solutions Honeywell International Inc. 1985 Douglas Drive North Golden Valley, MN 55422 www.honeywell.com/yourhome[...]