Schematic And Hookup Of T874L With Q674E. Used In Standard Applications - Honeywell T874 Product Data

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1
C1
FALL
H2
FALL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
2 FIELD REMOVABLE JUMPER.
Fig. 197. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
THERMOSTAT
H1
FALL
H1 ANTICIPATOR
H2
H2
FALL ANTICIPATOR
C1
RISE
C2 ANTICIPATOR
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 198. Schematic and hookup of T874L with Q674E. Used in standard applications.
60-2485—8
1
2
AUTO
ON
3
4
5
SYSTEM
SWITCH
EM. HT.
6
HEAT
OFF
11
COOL
1
FAN
SWITCH
AUTO
3
ON
4
6
7
SYSTEM
SWITCH
OFF
HEAT
8
AUTO
9
COOL
10
192
SUBBASE
AUX. HT.
LED (GREEN)
EM. HT.
FAN
LED (RED)
SWITCH
SUBBASE
SYSTEM COMPONENTS
G
FAN RELAY
W
AUX. HEATER
2
RELAY
U
B
COMPRESSOR
MONITOR
F
R
T
OUTDOOR
X2
THERMISTOR
OUTDOOR
THERMOSTAT
O
COOL
COMPRESSOR
CHANGEOVER
RELAY
VALVE
Y
M2970
SYSTEM COMPONENTS
STAGE 1 HEAT RELAY
W1
COMPRESSOR
CONTACTOR
Y1
FAN RELAY
G
R
STAGE 2
HEAT RELAY
W2
M2976
1
L1
(HOT)
L2
L1
(HOT)
L2
1