Honeywell T874 - Page 209

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
209 60-2485—8
Fig. 225. Schematic and hookup of T874D with Q674C. Used in standard applications.
M5928
H1
FALL
THERMOSTAT
SUBBASE SYSTEM COMPONENTS
1
4
6
8
9
10
11
FAN
SWITCH
SYSTEM
SWITCH
AUTO
ON
OFF
AUTO
SERVICE
LED (RED)
COOL DAMPER
COMPRESSOR CONTACTOR #2
HEAT RELAY #2
FAN RELAY
COMPRESSOR CONTACTOR #1
HEAT DAMPER
HEAT RELAY #1
H1
ANTICIPATOR
H2
ANTICIPATOR
C1
C2
RISE
RISE
FALL
CONTROL MODULE
H2
B
W1
Y1
G
RC
W2
A
Y2
O
RH
L1
(HOT)
L2
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
SYSTEM MONTIOR
L1
(HOT)
L2
1