Schematic And Hookup Of T874G With Q674C. Used In Standard Applications; Schematic And Hookup Of T874G With Q674E. Used In Heat Pump Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
H2 ANTICIPATOR
H2
RISE
C1
RISE
C2
Fig. 83. Schematic and hookup of T874G with Q674C. Used in standard applications.
THERMOSTAT
H1 ANTICIPATOR
FALL
H1
H2 ANTICIPATOR
FALL
H2
CO
RISE
RISE
C1
1
Fig. 84. Schematic and hookup of T874G with Q674E. Used in heat pump applications.
60-2485—8
1
FAN
SWITCH
4
AUTO
ON
FALL
6
8
OFF
9
HEAT
AUTO
C1 ANTICIPATOR
10
COOL
C2 ANTICIPATOR
11
1 POWER SUPPLY. PROVIDE DISCONECT MEANS
AND OVERLOAD PROTECTION AS REQUIRED.
1
2
4
6
8
SYSTEM
SWITCH
C1 ANTICIPATOR
OFF
9
HEAT
AUTO
10
COOL
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
SUBBASE
CHECK LED
(RED)
SUBBASE
FAN
SWITCH
AUTO
ON
116
SYSTEM COMPONENTS
L1
1
(HOT)
L2
HEAT RELAY 1
W1
COMPRESSOR
CONTACTOR 1
Y1
FAN RELAY
G
RC
HEAT RELAY 2
W2
RH
X1
COMPRESSOR
CONTACTOR 2
Y2
1
L2
L1
(HOT)
M5982
SYSTEM COMPONENTS
R
COOL
CHANGEOVER
OUTDOOR
VALVE
FAN RELAY
DEFROST
DEFROST
SWITCH
RELAY
M
HIGH PRESSURE
COMPRESSOR
SWITCH
CONTACTOR
F
FAN RELAY
DEFROST
RELAY
V
DEFROST
AUX. HT.
RELAY
RELAY
Y
L2
1
L1
(HOT)
M4666