Instruction/ maintenance manual of the product T874H Honeywell
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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.
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).
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.
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.
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.
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.
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 3.
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.
An important point after buying a device Honeywell T874H (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Honeywell T874H yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Honeywell T874H - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Honeywell T874H you will learn all the available features of the product, as well as information on its operation. The information that you get Honeywell T874H will certainly help you make a decision on the purchase.
If you already are a holder of Honeywell T874H, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Honeywell T874H.
However, one of the most important roles played by the user manual is to help in solving problems with Honeywell T874H. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Honeywell T874H along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
