Schematic And Hookup Of T874A, D With Q674E. Used In Standard Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
FALL
H1
H1
ANTICIPATOR
H2
ANTICIPATOR
H2
FALL
C1 RISE
C2
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 224. Schematic and hookup of T874A,D with Q674E. Used in standard applications.
60-2485—8
SUBBASE
1
4
FAN
SWITCH
AUTO
ON
6
SYSTEM
SWITCH
8
OFF
9
HEAT
AUTO
10
COOL
11
208
SYSTEM COMPONENTS
CONTROL MODULE
HEAT CHANGEOVER VALVE
B
HEAT RELAY #1
W1
COMPRESSOR CONTACTOR #1
Y1
FAN RELAY
G
RC
HEAT RELAY #2
W2
RH
SERVICE
LED (RED)
SYSTEM MONITOR
A
COMPRESSOR CONTACTOR #2
Y2
COOL CHANGEOVER VALVE
O
L1
(HOT)
L2
1
L1
(HOT)
L2
1
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