Honeywell Q674B manual

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Table of contents for the manual

  • Page 1

    X-XX UL INST ALLA TION INSTR UCTIONS Copyright © 1996 Honeywell Inc. • • All Rights Reserved T874H,Q,W Multistage Thermostats and Q674B,C,G,L Subbases APPLICA TION The T874H,Q,W Multistage Thermostats provide 24 to 30 Vac control for heating and cooling systems as listed in Table 1. Table 1. Heating and Cooling Stages. a Plus a changeover stag[...]

  • Page 2

    69-0087 — 6 2 T874H,Q,W MUL TIST AGE THERMOST A TS AND Q674B,C,G,L SUBBASES M6009 VERTICAL OUTLET BOX ADAPTER RING COVER PLATE MOUNTING SCREWS (2) 1 SUBBASE SUBBASE MOUNTING SCREWS (2) HORIZONTAL OUTLET BOX 1 2 2 1 NOT INCLUDED WITH UNIT. 2 ACCESSORY PARTS AVAILABLE (193121A). THERMOSTAT CAPTIVE MOUNTING SCREWS (2) 5 0 6 0 7 0 8 0 5 0 6 0 7 0 8 0[...]

  • Page 3

    69-0087 — 6 3 T874H,Q,W MUL TIST AGE THERMOST A TS AND Q674B,C,G,L SUBBASES FOR STRAIGHT INSERTION – STRIP 5/16 in. (8 mm) FOR WRAPAROUND – STRIP 7/16 in. (11 mm) SUBBASE TERMINAL SCREW M928 BARRIER L1 (HOT) L2 1 FAN RELAY Y2 SYSTEM SWITCH OFF AUTO H1 ANTICIPATOR CO H1 FALL 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS R[...]

  • Page 4

    69-0087 — 6 4 T874H,Q,W MUL TIST AGE THERMOST A TS AND Q674B,C,G,L SUBBASES L2 1 OFF H1 ANTICIPATOR H2 ANTICIPATOR H1 1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED. M6008A Y1 W1 C1 ANTICIPATOR AUTO FALL FALL CHANGEOVER RELAY L1 (HOT) R FAN RELAY COMPRESSOR CONTACTOR G 3 THERMOSTAT SUBBASE SYSTEM COMPONENTS NO FAN SW[...]

  • Page 5

    69-0087 — 6 5 T874H,Q,W MUL TIST AGE THERMOST A TS AND Q674B,C,G,L SUBBASES 1 L1 (HOT) L2 T W3 U G R E L X B O Y1 Y2 C815A OD THERMISTOR AUX. HEAT RELAY FAN RELAY EM. HEAT RELAY COMPRESSOR MONITOR CHANGEOVER RELAY (HEAT) CHANGEOVER RELAY (COOL) COMPRESSOR CONTACTOR 1 COMPRESSOR CONTACTOR 2 EM.HEAT AUTO ON FAN SWITCH H1 ANTICIPATOR H2 ANTICIPATOR [...]

  • Page 6

    69-0087 — 6 6 T874H,Q,W MUL TIST AGE THERMOST A TS AND Q674B,C,G,L SUBBASES Fig. 9. T874W/Q674L for three-stage heat and two-stage cool with outdoor reset. 1 T W3 G R E X1 C B O X2 Y1 Y2 C815A OUTDOOR THERMISTOR AUX. HT. RELAY FAN RELAY EM. HT. RELAY CHANGEOVER RELAY (HEAT) CHANGEOVER RELAY (COOL) COMPRESSOR CONTACTOR 1 COMPRESSOR CONTACTOR 2 EM.[...]

  • Page 7

    69-0087 — 6 7 T874H,Q,W MUL TIST AGE THERMOST A TS AND Q674B,C,G,L SUBBASES THERMISTOR RESISTANCE C815A THERMISTOR RESISTANCE R = 400 ohms ± 10% AT 77 ° F (25 ° C) 4600 4400 4200 4000 3800 3600 3400 3200 3000 2800 2600 2400 2200 2000 1800 1600 1400 1200 1000 800 600 400 200 0 -20 0 20 40 60 80 100 120 140 TEMPERATURE OF THERMISTOR ( ° F) M159[...]

  • Page 8

    69-0087 — 6 8 T874H,Q,W MUL TIST AGE THERMOST A TS AND Q674B,C,G,L SUBBASES Honeywell Limited-Honeywell Limitée 35 Dynamic Drive Scarborough, Ontario M1V 4Z9 Automation and Control Solutions Honeywell Internationl, Inc. 1985 Douglas Drive North Golden Valley, MN 55422 69-0087 — 6 C.H. Rev . 9-96 www .honeywell.com M5070 Fan (Select Models) Mov[...]