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Honeywell T874 Benutzerhandbuch

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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 further information, or would like to comment on our products or services, please write or 
phone:
1. Your local Home and Building Control Sales Office (check white pages of your phone directory).
2. Home and Building Control Customer Relations
Honeywell, 1885 Douglas Drive North
Minneapolis, Minnesota 55422-4386 (800) 328-5111
In Canada—Honeywell Limited/Honeywell Limitée, 35 Dynamic Drive, Scarborough, Ontario M1V 4Z9.
International Sales and Service Offices in all principal cities of the world. Manufacturing in Australia, Canada, Finland, France, 
Germany, Japan, Mexico, Netherlands, Spain, Taiwan, United Kingdom, U.S.A.
SPECIFICATIONS
IMPORTANT
The specifications given in this publication do not 
include normal manufacturing tolerances. Therefore, 
this unit may not exactly match the listed specifica-
tions. This product is tested and calibrated under 
closely controlled conditions, and some minor differ-
ences in performance can be expected if those con-
ditions are changed.
Super Tradeline®/Tradeline® Models
SUPER TRADELINE controls offer features not available on 
TRADELINE or standard models, and are designed to replace 
a wide range of Honeywell and competitive controls.
TRADELINE models are selected and packaged to provide 
ease of stocking, ease of handling, and maximum 
replacement value. Specifications of SUPER TRADELINE 
and TRADELINE controls are the same as those of standard 
models except as noted below.
Super Tradeline Models
T874 THERMOSTAT
T874D Thermostat. Provides two stages of heating and two 
stages of cooling. Use with Q674A-F Subbases.
Y594D (T874D/Q674E/TG504A) Thermostat/Subbase/key 
lock cover package. Provides two stages of heating and 
two stages of cooling. Includes a key lock cover for setpoint 
protection.
Y594G (T874G/Q674F) Thermostat/Subbase package for 
heat pump. Provides two stages of heating and one stage 
of cooling. Automatic changeover in heat or cool mode. 
Available in beige or Premier White® color.
Y594R (T874R/Q674L) Thermostat/Subbase package for 
heat pump. Provides two stages of heating and one stage 
of cooling. Manual changeover in heat or cool mode. Avail-
able in beige or Premier White® color.
SUPER TRADELINE FEATURES:
• SUPER TRADELINE package with cross reference label 
and special instruction sheet.
• SUPER TRADELINE model supplied with locking lever and 
locking cover accessories.
• Includes adjustable temperature locking stops.
• T874D replaces T874A-F TRADELINE or standard models.
Tradeline Models
T874 THERMOSTAT
• T874 TRADELINE models provide staged heat and/or cool 
operation. See Table 1.
Table 1. Heating and Cooling Stages.
• T874A-F are standard models.
TRADELINE FEATURES:
• TRADELINE package with cross reference label and 
special instruction sheet.
• T874A,C model available with factory stops for DoD 
applications.
• T874A,C model available with adjustable temperature 
locking stops.
Q674 SUBBASE
Q674 switching subbases provide system and fan switching. 
See Table 2.
Table 2. System and Fan Switching.
TRADELINE FEATURE:
• TRADELINE package with cross reference label and 
special instruction sheet.
• Q674A-E,G are standard (non-heat pump) models. 
Q674F,J,L are heat pump models.
Models
A
B
C
D
E
F
Heating  Stages
1
1
2
2
—
2
Cooling  Stages
1
2
1
2
2
—
Q674
System
Fan
A
Heat-Auto-Cool
Auto-On
B
Heat-Off-Cool
Auto-On
C
Off-Auto
Auto-On
D
None
None
E
Off-Heat-Auto-Cool
Auto-On
F
Em. Ht.-Off-Heat-Auto-Cool
Auto-On
G
Off-Auto
None
J
Em. Ht.-Auto-Off
Auto-On
L
Em. Ht.-Heat-Off-Cool
Auto-On