Honeywell Q674F,J manual

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Table of contents for the manual

  • Page 1

    T874G Thermostats and Q674F ,J Subbases for Heat Pump Systems J.H. • Rev. 7-94 • • ©Honeywell Inc. 1994 • Form Number 69-0435—10 TRADELINE ® TABLE 1—THERMOSTAT/SUBBASE SPECIFICATIONS. Application The T874G Thermostats and Q674F,J Subbases pro- vide 24 to 30 Vac control of 2-stage heating and 1-stage cool- ing heat pump systems with au[...]

  • Page 2

    69-0435—10 2 IMPORTANT: Thermostats are calibrated at the factory by using subbases mounted at true level. Inaccurate sub- base leveling will cause thermostat control deviation. LOCATION Install the thermostat about 5 ft [1.5 m] above the floor in an area with good air circulation at average temperature. Do not install the thermostat where it can[...]

  • Page 3

    3 69-0435—10 Fig. 2—Installation of Q674 Subbase on wall. WIRES THROUGH WALL OPENING WALL WALL ANCHORS (2) SUBBASE MOUNTING HOLES MOUNTING SCREWS (2) M926 Fig. 3—Subbase components and leveling procedure. SPIRIT LEVEL MOUNTING HOLES (2) M927 TOP MOUNTING HOLES (2) WIRING TERMINAL THERMOSTAT CABLE OPENING TO SPRING FINGER CONTACTS ON THE THERM[...]

  • Page 4

    69-0435—10 4 Fig. 5—Internal schematic and typical wiring diagram for Y594G1252 (T874G1246/Q674F1212); auto changeover in cooling. H2 FALL L1 (HOT) L2 1 R W3 W2 X L G O E Y RTD1 OTD1 EHR1 ODT2 EHR2 RTD2 RTD3 RTD1 SYSTEM MONITOR FAN RELAY RD COOL CHANGEOVER VALVE EM. HEAT RELAY LACO COMPRESSOR CONTACTOR CHP 2 3 4 5 6 8 9 10 H1 FALL H1 ANTICIPATO[...]

  • Page 5

    5 69-0435—10 Fig. 7—Internal schematic and typical wiring diagram for Y594G1419 (T874G1642/Q674F1444), Y594G1476 (T874G1741/Q674F1477) and Y594G1534 (T874G1824/Q674F1477 sold only in Australia); auto changeover in heating and cooling; fixed anticipation. CHECK LED has isolated terminals. Factory- installed W1-Y1 jumper is equivalent to Y termin[...]

  • Page 6

    69-0435—10 6 Fig. 8—Internal schematic and typical wiring diagram for Y594G1526 (T874G1626/Q674F1436); auto changeover in heating. M1592A (HOT) L1 L2 1 LACO CHP Y B E G L X W2 R ODT 1 RTD 1 EHR 1 RTD 2 ODT 2 EHR 2 RTD 3 RD COMPRESSOR FAILURE FAN RELAY COMPRESSOR CONTACTOR HEAT CHANGEOVER VALVE EM. HT. RELAY RTD 1 AUX. HEAT LED (GREEN) EM. HT. L[...]

  • Page 7

    7 69-0435—10 Fig. 10—Internal schematic and typical wiring diagram for Y594G1567 (T874G1865/Q674J1209) and Y594G1575 (T874G1873/Q674J1225); auto changeover in cooling. Exact replacement for York model nos. 2TH11702424 and 6TH11702424. EM. HT. AUX. HEAT RELAY POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. 1 RISE CO R[...]

  • Page 8

    69-0435—10 8 MOUNTING THE THERMOSTAT 1. Remove the thermostat cover by pulling the bot- tom edge of the cover away from the base until it snaps free of the retaining posts. NOTE: The cover is hinged at the top and must be removed by pulling out at the bottom. 2. Carefully remove and discard the foam packing in- sert that protects the mercury swit[...]

  • Page 9

    9 69-0435—10 Checkout HEATING Move the system switch on the Q674 Subbase to HEAT. Move the heating set point lever on the T874 Thermostat about 10 ° F [6 ° C] above room tempera- ture. Both stages of heating and fan should start. Move the set point lever about 10 ° F [6 ° C] below room temperature. Heating and fan should shut off. NOTE: To pr[...]

  • Page 10

    69-0435—10 10[...]

  • Page 11

    11 69-0435—10[...]

  • Page 12

    Home and Building Control Home and Building Control Honeywell Honeywell Limited—Honeywell Limitée 1985 Douglas Drive North 35 Dynamic Drive Golden Valley, Minnesota 55422 Scarborough, Ontario M1V 4Z9 69-0435–10 Printed in U.S.A.[...]