Honeywell Q674F User Manual

Tradeline, Application

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T874G Thermostats

and Q674F,J Subbases

for Heat Pump Systems

J.H. • Rev. 7-94 • • ©Honeywell Inc. 1994 • Form Number 69-0435—10

TRADELINE

®

TABLE 1—THERMOSTAT/SUBBASE SPECIFICATIONS.

Application

The T874G Thermostats and Q674F,J Subbases pro-

vide 24 to 30 Vac control of 2-stage heating and 1-stage cool-
ing heat pump systems with automatic changeover. Stage 1

heat and cool anticipation is fixed voltage type; stage 2 heat
anticipation is adjustable (except as noted). See Table 1 for
specific T874G/Q674F,J combinations and specifications.

Installation Instructions for the Trained Service Technician.

Thermostat/

Subbase

Thermostat/

Subbase

Model

LED

Switching

See

Package

Numbers

Indication

System

Fan

Changeover

Comments

Fig.

Y594G1252

T874G1246/

Q674F1212

AUX.HT.,

EM.HT.

a

EM.HT.-OFF-

HEAT-AUTO-

COOL

AUTO-

ON

AUTO,

COOL

TRADELINE

®

5

T874G1246/

Q674F1410

AUX.HT.,

EM.HT.

a

EM.HT.

b

-OFF-

HEAT-AUTO-

COOL

AUTO-

ON

AUTO,

COOL

Separate W1 and Y1
terminals; TRADELINE

®

subbase.

6

Y594G1419

T874G1642/

Q674F1444

AUX.HT.,

EM.HT.,

CHECK

OFF-EM.HT.-

HEAT-AUTO-

COOL

AUTO-

ON

AUTO,

HEAT OR

COOL

SUPER TRADELINE

®

;

includes factory-installed
jumper across W1 and Y1;
fixed stage 2 heat anticipation.

7

Y594G1476

c

T874G1741/

Q674F1477

Isolated CHECK LED
includes jumper for connecting
X2 terminal to X or R for
power.

Y594G1534

d

T874G1824/

Q674F1477

Y594G1526

T874G1626/

Q674F1436

AUX.HT.,

EM.HT.

OFF-EM.HT.-

HEAT-AUTO-

COOL

AUTO-

ON

AUTO,

HEAT

TRADELINE

®

8

T874D1165

or

T874E1016/

Q674F1543

(RED)

e

OFF-EM.HT.-

HEAT-AUTO-

COOL

AUTO-

ON

AUTO

TRADELINE

®

subbase; exact

replacement for York model
no. 2TB04700524. Thermostat
not included; order separately.

9

Y594G1567

T874G1865/

Q674J1209

EM.HT.

EM.HT.-

AUTO-OFF

AUTO-

ON

AUTO,

COOL

TRADELINE

®

; exact

replacement for York model
nos. 2TH11702424 and
6TH11702424.

10

Y594G1575

c

T874G1873/

Q674J1225

EM.HT.

EM.HT.-

AUTO-OFF

AUTO-

ON

AUTO,

COOL

TRADELINE

®

; exact

replacement for York model
nos. 2TH11702424 and
6TH11702424.

10

Y594G1633

T874G1972/

Q674F1584

AUX.HT.,

EM.HT.

OFF-EM.HT.-

HEAT-AUTO-

COOL

AUTO-

ON

AUTO,

HEAT OR

COOL

TRADELINE

®

11

a

EM.HT. also shows compressor malfunction.

b

When switch is in EM. HT. position, the emergency heat will operate continuously until system switch is moved to another position.

c

Thermostat is white and subbase is gray.

d

Sold only in Australia; degrees C.

e

LED indicator is not labeled but may be connected per user's requirements. See Fig. 9.

M3375

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