T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
Tradeline Models
SPECIFICATIONS
T874 THERMOSTAT
IMPORTANT
•
T874 TRADELINE models provide staged heat and/or cool
operation. See Table 1.
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.
Table 1. Heating and Cooling Stages.
Models
A
1
1
B
1
2
C
2
1
D
2
2
E
—
2
F
2
Heating Stages
Cooling Stages
—
•
T874A-F are standard models.
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 FEATURES:
•
•
•
TRADELINE package with cross reference label and
special instruction sheet.
T874A,C model available with factory stops for DoD
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.
applications.
T874A,C model available with adjustable temperature
locking stops.
Q674 SUBBASE
Q674 switching subbases provide system and fan switching.
See Table 2.
Super Tradeline Models
T874 THERMOSTAT
Table 2. System and Fan Switching.
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 set-
point 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.
Q674
A
System
Heat-Auto-Cool
Heat-Off-Cool
Fan
Auto-On
Auto-On
Auto-On
None
B
C
Off-Auto
D
None
E
Off-Heat-Auto-Cool
Em. Ht.-Off-Heat-Auto-Cool
Off-Auto
Auto-On
Auto-On
None
F
G
J
Em. Ht.-Auto-Off
Em. Ht.-Heat-Off-Cool
Auto-On
Auto-On
L
SUPER TRADELINE FEATURES:
•
SUPER TRADELINE package with cross reference label
and special instruction sheet.
TRADELINE FEATURE:
•
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 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.
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
2
.
.
Your local Home and Building Control Sales Office (check white pages of your phone directory).
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.
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0-2485—8
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