Schematic And Hookup Of T874D With Q674L. Used In Heat Pump Applications - Honeywell T874 Product Data

THERMOSTAT
H1
H1
ANTICIPATOR
FALL
H2
ANTICIPATOR
H2
FALL
C1 ANTICIPATOR
C1
RISE
C2 ANTICIPATOR
C2
RISE
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
Fig. 107. Schematic and hookup of T874D with Q674L. Used in heat pump applications.
THERMOSTAT
H1/C1
ANTICIPATOR
H1
C1
FALL
3
4
5
FALL
H2
6
H2
ANTICIPATOR
1 POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
Fig. 108. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
FAN
2
SWITCH
AUTO
ON
3
4
5
8
SYSTEM
SWITCH
10 EM. HT.
HEAT
OFF
11
COOL
SUBBASE
FAN
SWITCH
2
AUTO
ON
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
129
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
O
G
Y1
E
L
EM. HT.
LED (RED)
C
Y
AUX. HT.
LED (YELLOW)
EM. HT.
LED (RED)
SYSTEM COMPONENTS
COOL CHANGEOVER
VALVE
FAN RELAY
OUTDOOR
SUPPL. HT.
THERMSTAT
RELAY
EM. HT.
COMPRESSOR
RELAY CONTACT
CONTACTOR 2
EM. HT. RELAY
COMP.
FAILURE
L1
(HOT)
R
L2
COMPRESSOR
CONTACTOR 1
SYSTEM COMPONENTS
R
FAN RELAY
G
AUX. HT. RELAY
W
B
X
COOL CHANGEOVER
VALVE
O
COMPRESSOR
CONTACTOR
Y
1
M4727
L1
(HOT)
L2
1
M4725
60-2485—8