Bryant T874 - Manual

Bryant T874

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Table of Contents:

  • Page 2 – IMPORTANT; Super Tradeline; Super Tradeline Models; SUPER TRADELINE FEATURES:; Tradeline Models; Models
  • Page 3 – Standard Models; Switching: Coiled bimetal elements operate mercury
  • Page 7 – MERCURY NOTICE; INSTALLATION; When Installing this Product...; CAUTION; Location
  • Page 8 – Wire Subbase; Equipment Damage Hazard.
  • Page 11 – Mount Thermostat; SETTINGS; Set the Heat Anticipator
  • Page 12 – FAN SWITCH positions control fan operation as follows:; Setting the Adjustable Differential
  • Page 13 – Verify the Adjustment; CHECKOUT; Heating
  • Page 14 – Fan; CALIBRATION; Thermostat; UNDERSTANDING CIRCUITS
  • Page 21 – OPERATION; Heat Anticipation/Cool Anticipation; Interstage Differential
  • Page 22 – Features; Applications
  • Page 23 – Commercial Rooftop Application; Fig. 33. Typical commercial rooftop economizer; Heat Pump Application
  • Page 24 – Cycling Rate
  • Page 25 – Low Temperature Lockouts
  • Page 26 – Defrost Control; Defrost Control Functions; OUTDOOR FAN; Auxiliary Heat
  • Page 27 – Stage or Time Modulated Control
  • Page 28 – Fig. 41. Emergency heat relay that bypasses; Crankcase Heat
  • Page 29 – CROSS REFERENCE; Model Number
  • Page 74 – Model
  • Page 96 – WIRING DIAGRAMS
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PRODUCT DATA

60- 2485- 8

® U.S. Registered Trademark
Copyright © 2001 Honeywell • All Rights Reserved

T874 Multistage Thermostats

and Q674 Subbases

APPLICATION

These thermostats and subbases provide low voltage control
of multistage heating and cooling systems, including heat
pump systems.

FEATURES

•

T874 Thermostat has silent, dust-free mercury
switches operated by coiled bimetal elements.

•

Heat anticipator(s) are adjustable or fixed cooling
anticipator(s) are fixed.

•

Individual heat and cool levers and scales (most
models) for temperature setting located on top of
thermostat case.

•

Cover thermometer on most T874 Multistage
Thermostat models.

•

Locking cover and locking lever screws available for
T874 Multistage Thermostats.

•

Versaguard™ Thermostat Guard or custom key lock
thermostat guards available for T874 Multistage
Thermostats.

•

T874 Thermostat requires a Q674 Subbase.

•

Q674 Subbase provides system and fan switching,
wiring terminals and mounting base for T874
Multistage Thermostat.

•

Adapter plate available for mounting Q674 on wall or
horizontal outlet box.

•

Light-emitting diodes (LEDs) located on subbase for
easy reference.

•

Up to three stages each of heating and cooling control
possible.

•

Models with setpoint restrictions and locking cover
with no thermometer available for Department of
Defense (DoD) and other special applications.

•

Outdoor reset used on some models to improve
thermal performance.

Contents

Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Checkout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Understanding Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Cross Reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 96

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Summary

Page 2 - IMPORTANT; Super Tradeline; Super Tradeline Models; SUPER TRADELINE FEATURES:; Tradeline Models; Models

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 60-2485—8 2 ORDERING INFORMATION When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need f...

Page 3 - Standard Models; Switching: Coiled bimetal elements operate mercury

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 3 60-2485—8 Standard Models T874 THERMOSTATS Models: See Table 3. Electrical Rating: 24 to 30 Vac. Switching: Coiled bimetal elements operate mercury switches. Temperature Adjustment: Heating and cooling setting levers, with separate scales located on to...

Page 7 - MERCURY NOTICE; INSTALLATION; When Installing this Product...; CAUTION; Location

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES 7 60-2485—8 MERCURY NOTICE This control contains mercury in a sealed tube. Do not place control in the trash at the end of its useful life. If this control is replacing a control that contains mercury in a sealed tube, do not place your old control in th...

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