Schematic And Hookup Of T874G With Q674B. Used In Heat Pump Applications; Schematic And Hookup Of T874J With Q674J. Used In Heat Pump Applications - Honeywell T874 Product Data

THERMOSTAT
FALL
H1 ANTICIPATOR
H1
FALL
H2
H2
ANTICIPATOR
RISE
CO
C1
ANTICIPATOR
C1
RISE
Fig. 143. Schematic and hookup of T874G with Q674B. Used in heat pump applications.
THERMOSTAT
FALL
H1
2
3
H1 ANTICIPATOR
4
H2 ANTICIPATOR
5
H2 FALL
6
8
RISE
9
CO C1 ANTICIPATOR
10
RISE
C1
11
CO
12
Fig. 144. Schematic and hookup of T874J with Q674J. Used in heat pump applications.
SUBBASE
1
FAN
SWITCH
2
AUTO
4
ON
6
SYSTEM
SWITCH
OFF
AUTO
8
9
10 1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
SUBBASE
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
SUPL. HT.
ON
OFF
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
157
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
AUX. HT. LED
(RED)
R
Y
G
W2
SUPP. HT.
LED (RED)
L
C
E
X
P
O
SYSTEM COMPONENTS
Y1
COMPRESSOR
CONTACTOR
FAN RELAY
G
R
L1
(HOT)
L2
1
W1
AUX. HT. RELAY
C
O
COOL
CHANGEOVER VALVE
M8378
SYSTEM COMPONENTS
L1
L2
(HOT)
1
COMPRESSOR CONTACTOR
FAN RELAY
HEAT RELAY 1
OUTDOOR
THERMOSTAT
HEAT RELAY
HEAT RELAY 2
CONTACT 1
HEAT RELAY
HEAT RELAY 3
CONTACT 2
"P" RELAY
"X" RELAY
COOL CHANGEOVER
VALVE
M5956
60-2485—8