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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 4
Key Lock Cover: Part no. TG504A replaces existing T874
cover. Mounts on T874 base and covers thermostat settling
levers and subbase switches. Includes LED window and
two keys. Should not be used with 193121A Adapter Plate.
— TG504A1025: Blank face, internal thermometer.
— TG504A1033: External thermometer. See Fig. 2.
Fig. 2. T874 Thermostat accessories.
Table 3. T874 Thermostat Specifications.
Models and Options Replaces Applications
System Stages
Anticipation
Heating (Adj) Cooling (Fixed)
Heat Cool Other Stage 1 Stage 2 Stage 1 Stage 2
T874A—Standard and TRADELINE®.
— 72°F/78°F (22°C/26°C)setpoint
stops with locking cover.
— Adjustable anticipator set 0.4A.
— Adjustable locking temperature
stops (TRADELINE®).
— 72°F/78°F (22°C/26°C) setpoint
stops with locking cover, no
thermometer (for DoD
a
).
T872A Standard 1 1 — 0.1-1.2A — 0-1.5A —
T874B—Standard and TRADELINE. T872B Standard 1 2 — 0.1-1.2A — 0-1.2A 0-1.0A
T874C—Standard and TRADELINE.
— 72°F/78°F (22°C/26°C)set stops
with locking cover, no thermometer
(for DoD
a
).
— 12°F (7°C) differential between
H1 and H2 stages (T874C1125).
T872C Standard 2 1 — 0.1-1.2A 0.1-1.2A 0-1.5A —
— Fast cycling. 0.12-
0.6A
0.12-
0.6A
T874D—Standard and SUPER
TRADELINE®.
— Adjustable locking temperature
stops (SUPER TRADELINE).
T872D Standard 2 2 — 0.1-1.2A 0.1-1.2A 0-1.2A 0-1.0A
T874E—Standard and TRADELINE. T872E 2-Stage Cool — 2 — — — 0-1.2A 0-1.0A
T874F—Standard and TRADELINE.
— Locking cover.
T872F 2-Stage Heat 2 — — 0.1-1.2A 0.1-1.2A — —
a
Department of Defense.
b
Changeover stage operates with heating.
c
Fixed voltage type anticipation.
d
Changeover stage operates with heating; a secondary changeover is provided in cooling switch.
e
Provides night setback used with standard T874 and timer-operated remote switching.
f
Manual changeover stage—use Q674B,L subbase.
g
Changeover stage operates with cooling.Q674 Subbases
194559R Locking Cover
with Thermometer
Allen Wrench
TG511D1004 Includes
Painted Steel Cover,
Opaque Base and Wallplate
TG504A1033 Key Lock
Cover with External
Thermometer