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

THERMOSTAT
H1 ANTICIPATOR
H1
FALL
H2
H2
ANTICIPATOR
FALL
CO
RISE
C1 ANTICIPATOR
C1
RISE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 195. Schematic and hookup of T874G with Q674F. Used in heat pump applications.
THERMOSTAT
H1 ANTICIPATOR
H1
FALL
H2
H2
ANTICIPATOR
FALL
CO
RISE
C1 ANTICIPATOR
C1
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 196. Schematic and hookup of T874G with Q674J. Used in heat pump applications.
SUBBASE
1
FAN SWITCH
2 AUTO
ON
4
SYSTEM
SWITCH
6
OFF
8
EM. HT.
HEAT
9
AUTO
COOL
10
SUBBASE
1
FAN SWITCH
2 AUTO
ON
4
6
SYSTEM
8
SWITCH
SUPL. HT.
9
ON
OFF
10
191
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
O
G
B
R
E
L
EM. HT. LED
(RED)
X
AUX.
W2
HT. LED
(GREEN)
Y
O
G
R
W2
E
L
SUPL. HT.
LED
C
(RED)
Y
SYSTEM COMPONENTS
L1
COOL
(HOT)
CHANGEOVER
L2
VALVE
1
FAN RELAY
"B" RELAY
EM. HT.
RELAY
COMPRESSOR
FAULT
AUX. HT. RELAY
COMPRESSOR
CONTACTOR
M2974
SYSTEM COMPONENTS
L1
COOL
(HOT)
CHANGEOVER
L2
VALVE
1
FAN RELAY
H.C.R.1
O.D.T.
H.C.R.1
H.C.R.2
H.C.R.2 H.C.R.3
COMPRESSOR
CONTACTOR
M2975
60-2485—8