Honeywell T874 Product Data page 130

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
H1
C1
FALL
H2
FALL
POWER SUPPLY. PROVIDE DISCONNECT
1
MEANS AND OVERLOAD PROTECTION
AS REQUIRED.
Fig. 109. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
60-2485—8
1
2
H1/ C1
ANTICIPATOR
3
FAN
SWITCH
AUTO
4
ON
5
RESET
HEATER
6
SYSTEM
SWITCH
EM. HT.
HEAT
OFF
COOL
SUBBASE
AUX. HT.
LED (GREEN)
EM. HT.
LED (RED)
COMPRESSOR
FAILURE
130
SYSTEM COMPONENTS
AUX. HT. RELAY
W
B
F
G
FAN RELAY
L1
R
(HOT)
L2
1
X2
OUTDOOR
THERMOSTAT
T
OUTDOOR
COOL
THERMISTOR
CHANGEOVER
VALVE
O
COMPRESSOR
CONTACTOR
Y
M5071