Honeywell T874G Manual De Usuario

69-0268—11

3

T874G,R MULTISTAGE HEAT PUMP THERMOSTATS AND Q674F,J,L SUBBASES

H1

FALL

RISE

CO

L1 
(HOT)

L2

1

3

C1

RISE

1

2

2

3

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND 
OVERLOAD PROTECTION AS REQUIRED.

TERMINAL LABELED C/X ON SOME MODELS.

W3 TERMINAL ON SOME MODELS ONLY.

C1 ANTICIPATOR

H1 ANTICIPATOR

FAN SWITCH

AUTO

ON

SYSTEM 
SWITCH

AUTO

HEAT

OFF

COOL

1

2

4

6

8

9

10

O

W2

X

E

L

B

W3

R

G

Y

AUX. HT. RELAY

FAN RELAY

EM. HT. RELAY

B RELAY

M5986A

THERMOSTAT

SUBBASE

SYSTEM COMPONENTS

11

12

COMPRESSOR
CONTACTOR

EM. HT.

EM. HT.
LED (RED)

AUX. HT.
LED (GREEN)

COOL CHANGEOVER 
VALVE

H2

FALL

H2 
ANTICIPATOR

AUX HT. RELAY