Schematic And Hookup Of T874R With Q674B. Used In Heat Pump Applications; Schematic And Hookup Of T874P With Q674B. Used In Heat Pump Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1
C1
FALL
FALL
H2
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 67. Schematic and hookup of T874R with Q674B. Used in heat pump applications.
THERMOSTAT
H1
3
H2
ANTICIPATOR
FALL
RISE
CO
H1
C1
RISE
C1 ANTICIPATOR
1
POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
2 JUMPER HONEYWELL SUPPLIED, FIELD INSTALLED.
H2 MAKE OFFEST 8˚ F BELOW H1 MAKE.
3
Fig. 68. Schematic and hookup of T874P with Q674B. Used in heat pump applications.
60-2485—8
1
FAN SWITCH
2
AUTO
H1/C1 ANTICIPATOR
3
4
5
SYSTEM
SWITCH
HEAT
6
COOL
1
2
3
FAN
SWITCH
4
AUTO
5
ON
6
8
SYSTEM SWITCH
OVERRIDE
9
HEAT
OFF
10
COOL
SUBBASE
ON
OFF
SUBBASE
OVERRIDE
LED (RED)
108
SYSTEM COMPONENTS
X
FAN RELAY
G
L1
(HOT)
R
1
L2
HEAT CHANGEOVER
VALVE
B
W2
AUX. HT. RELAY
COMPRESSOR
CONTACTOR
Y
SYSTEM COMPONENTS
Y
COMPRESSOR CONTACTOR
G
C
CLOSED-DAY
OPEN-NITE
R
SERVICE
LED (RED)
B
L
X
COMPRESSOR
S
FAULT
2
JUMPER
P COOL CHANGEOVER VALVE
W
T
M5998
FAN RELAY
L2
L1
(HOT)
1
B RELAY
M101A