Schematic And Hookup Of T874K With Q674C. Used In Heat Pump Applications; Schematic And Hookup Of T874P With Q674C. Used In Heat Pump Applications - Honeywell T874 Product Data

THERMOSTAT
FALL
CO
FALL
H2
FALL
H1
H1 ANTICIPATOR
RISE
C1
C1
ANTICIPATOR
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
2
JUMPER RH AND RC FOR SINGLE
TRANSFORMER SYSTEM.
Fig. 77. Schematic and hookup of T874K with Q674C. Used in heat pump applications.
THERMOSTAT
1
FALL
H2
2
H1
ANTICIPATOR
3
4
5
6
CO
H1
RISE
8
9
C1
C1
ANTICIPATOR
10
RISE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2 JUMPER HONEYWELL SUPPLIED, FIELD INSTALLED.
Fig. 78. Schematic and hookup of T874P with Q674C. Used in heat pump applications.
SUBBASE
1
FAN
SWITCH
AUTO
3
ON
4
6
8
SYSTEM
SWITCH
9
OFF
AUTO
10
FAN
SWITCH
AUTO
ON
SYSTEM
SWITCH
OVERRIDE
AUTO
OFF
113
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
RESET
X1
LED (RED)
G
RH
W1
W3
W2
B
RC
O
Y1
SUBBASE
SYSTEM COMPONENTS
FAN RELAY
L1
(HOT)
L2 1
2
HEAT CHANGEOVER
VALVE
HEAT RELAY 2
HEAT RELAY 1
"B" RELAY
L1
(HOT)
1
L2
"O" RELAY
COMPRESSOR
CONTACTOR
SYSTEM COMPONENTS
Y
COMPRESSOR
CONTACTOR
G
FAN RELAY
C
R
SETBACK
CONTACT
B
HEAT
CHANGEOVER
VALVE
L
JUMPER 2
S
REVERSING
P
VALVE
W
M7026
M4729
L1
(HOT)
L2
1
60-2485—8