Bryant Q674 Manual

A SERVICE OF

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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