Honeywell T874 - Schematic and Hookup of T874 G with Q674 G. Used in Standard Applications

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
60-2485—8 210
Fig. 226. Schematic and hookup of T874G with Q674G. Used in standard applications.
M593
0
H1
FALL
L1
(HOT)
L2
1
L1
(HOT)
L2
1
THERMOSTAT SUBBASE
SYSTEM COMPONENTS
1
4
6
8
9
10
11
SYSTEM
SWITCH
OFF
AUTO
SERVICE
LED (RED)
FAN RELAY O
COMPRESSOR CONTACTOR #2
HEAT RELAY #2
T RELAY
COMPRESSOR CONTACTOR #1
FAN RELAY B
HEAT RELAY #1
H1
ANTICIPATOR
H2
ANTICIPATOR
C1
C2
RISE
RISE
FALL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
CONTROL MODULE
H2
B
W1
Y1
T
RC
W2
RH
A1
Y2
O
5
7
12
A2
SERVICE
LED (RED)
NO FAN
SWITCH
SYSTEM MONITOR
SYSTEM MONITOR