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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—84
Ke
y
Lock Cover: Part no. TG504A replaces existin
g
T874
cover. Mounts on T874 base and covers thermostat set-
tlin
g
levers and subbase switches. Includes LED window
and two ke
y
s. Should not be used with 193121A Adapter
Plate.
— TG504A1025: Blank face, internal thermometer.
— TG504A1033: External thermometer. See Fi
g
. 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 lockin
g
cover.
— Ad
j
ustable anticipator set 0.4A.
— Ad
j
ustable lockin
g
temperature
stops
(
TRADELINE®
)
.
— 72°F/78°F
(
22°C/26°C
)
setpoint
stops with lockin
g
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 lockin
g
cover, no thermometer
(
for DoD
a
)
.
— 12°F
(
7°C
)
differential between
H1 and H2 sta
g
es
(
T874C1125
)
.
T872C Standard 2 1 — 0.1-1.2A 0.1-1.2A 0-1.5A —
— Fast c
y
clin
g
. 0.12-
0.6A
0.12-
0.6A
T874D—Standard and SUPER
TRADELINE®.
— Ad
j
ustable lockin
g
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-Sta
g
e Cool — 2 —— —0-1.2A 0-1.0A
T874F—Standard and TRADELINE.
— Lockin
g
cover.
T872F 2-Sta
g
e Heat 2 ——0.1-1.2A 0.1-1.2A ——
a
Department of Defense.
b
Chan
g
eover sta
g
e operates with heatin
g
.
c
Fixed volta
g
e t
y
pe anticipation.
d
Chan
g
eover sta
g
e operates with heatin
g
; a secondar
y
chan
g
eover is provided in coolin
g
switch.
e
Provides ni
g
ht setback used with standard T874 and timer-operated remote switchin
g
.
f
Manual chan
g
eover sta
g
e—use Q674B,L subbase.
g
Chan
g
eover sta
g
e operates with coolin
g
.
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