Schematic And Hookup Of T874G With Q674C. Used In Heat Pump Applications; Schematic And Hookup Of T874H With Q674C. Used In Heat Pump Applications - Honeywell T874 Product Data

THERMOSTAT
H ANTICIPATOR
H1
FALL
SETBACK
FALL
CO
RISE
C ANTICIPATOR
C1
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 73. Schematic and hookup of T874G with Q674C. Used in heat pump applications.
THERMOSTAT
H1
ANTICIPATOR
FALL
H1
RISE
C1
ANTICIPATOR
CO
RISE
C1
POWER SUPPLY. PROVIDE DISCONNECT MEANS
1
AND OVERLOAD PROTECTION AS REQUIRED.
2
SERVICE LED ON SELECT MODELS.
Fig. 74. Schematic and hookup of T874H with Q674C. Used in heat pump applications.
SUBBASE
2
3
FAN SWITCH
4
AUTO
ON
6
8
SYSTEM
SWITCH
9
OFF
10
AUTO
SUBBASE
2
3
FAN SWITCH
4
AUTO
ON
SYSTEM
8
SWITCH
OFF
9
AUTO
10
111
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
Y1
Y2
G
R
L
SYSTEM COMPONENTS
Y1
COOL CHANGEOVER
VALVE
G
R
Y2
B
L1
O
(HOT)
2
X
SERVICE LED
COMPRESSOR
(YELLOW)
FAULT
C
SYSTEM COMPONENTS
REVERSING
VALVE RELAY
COMPRESSOR
CONTACTOR
FAN RELAY
L2
L1
OPEN-NIGHT
(HOT)
CLOSED-DAY
1
SETBACK
RELAY
M7008
FAN RELAY
COMPRESSOR
CONTACTOR
1
L2
M3680A
60-2485—8