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Honeywell Q674L manual

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Table of contents for the manual

  • Page 1

    X-XX UL INST ALLA TION INSTRUCTIONS ®U.S. Registered Trademark Copyright © 1997 Honeywell Inc. • • All Rights Reserved T874R Thermostats and Q674L Subbases Installation Instructions for the T rained Service T echnician. APPLICA TION The T874R Thermostat and Q674L Subbase provide 24 to 30 Vac control of 2-stage heating and 1-stage cool-ing hea[...]

  • Page 2

    69-0392—9 2 T874R THERMOST A TS AND Q674L SUBBASES OPERA TION On a 2-heat thermostat, the two stages of heat make sequentially as the temperature drops. Make refers to the mercury switch initiating a call for heat or cool. There is about 1 ° F (0.6 ° C) between stages so the sec- ond stage makes only when the first stage can not handle the load[...]

  • Page 3

    69-0392—9 3 T874R THERMOST A TS AND Q674L SUBBASES 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 NOT INCLUDED WITH UNIT. ACCESSORY PARTS AVAILABLE (193121A). 1 2 Fig. 1. Installation of subbase on outlet box. WIRES THROUGH WALL OPENING WA[...]

  • Page 4

    69-0392—9 4 T874R THERMOST A TS AND Q674L SUBBASES Fig. 5. Internal schematic and typical wiring diagram for Y594R1763 (T874R1954/Q674L1827). Replaces GE AY28X078, AY28X139; Trane Baystat 139, Baystat 239 and Baystat 240; and Honeywell Y594R1136 Thermostats. H1 FALL C1 L1 (HOT) L2 1 G W U B F R T X2 O Y FAN RELAY AUX. HEATER RELAY COMPRESSOR MONI[...]

  • Page 5

    69-0392—9 5 T874R THERMOST A TS AND Q674L SUBBASES Fig. 7. Internal schematic and typical wiring diagram for Y594R1300 (T874R1475/Q674L1520); fixed anticipation. H2 FALL H1 FALL C1 L1 (HOT) L2 1 2 2 1 2 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. CONNECT CHANGEOVER RELAY TO B FOR HEAT CHANGEOVER, TO O FOR COOL CHAN[...]

  • Page 6

    69-0392—9 6 T874R THERMOST A TS AND Q674L SUBBASES Fig. 9. Internal schematic and typical wiring diagram for Y594R1664 (T874R1871/Q674L1736) and Y594R1706 (T874R1913/Q674L1777). Exact replacement for York model no. 2TH11702224. H2 FALL H1 FALL C1 L1 (HOT) L2 1 FAN SWITCH AUTO ON FAN RELAY AUX. HT. RELAY "H" RELAY EM. HT. RELAY CHANGEOVE[...]

  • Page 7

    69-0392—9 7 T874R THERMOST A TS AND Q674L SUBBASES Fig. 11. Internal schematic and typical wiring diagram for Y594R1672 (T874R1889/Q674L1736) and Y594R1698 (T874R1905/Q674L1777). Exact replacement for York model nos. 2TH11702324 and 6TH11702224. H2 FALL H1 FALL C1 L1 (HOT) L2 1 FAN SWITCH AUTO ON FAN RELAY AUX. HT. RELAY "H" RELAY EM. H[...]

  • Page 8

    69-0392—9 8 T874R THERMOST A TS AND Q674L SUBBASES Mounting the Thermostat 1. Remove the thermostat cover by pulling the bottom edge of the cover away from the base until it snaps free from the cover clip. NOTE: The cover is hinged at the top and can be removed by pulling out at the bottom. 2. Carefully remove and discard polystyrene packing inse[...]

  • Page 9

    69-0392—9 9 T874R THERMOST A TS AND Q674L SUBBASES M5070 CHECKOUT Heating Move the system switch on the Q674 Subbase to HEAT. Move the setpoint lever on the T874 Thermostat about 10 ° F (6 ° C) above room temperature. Both stages of heating and the fan should start. Move the setpoint lever about 10 ° F (6 ° C) below room temperature. Heating [...]

  • Page 10

    69-0392—9 10 T874R THERMOST A TS AND Q674L SUBBASES[...]

  • Page 11

    69-0392—9 11 T874R THERMOST A TS AND Q674L SUBBASES[...]

  • Page 12

    69-0392—9 12 T874R THERMOST A TS AND Q674L SUBBASES 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[...]