Instruction/ maintenance manual of the product Q674F,J Honeywell
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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.
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.
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.
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.
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.
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.
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.
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.
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.
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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.
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