Honeywell T874 Product Data page 142

T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
THERMOSTAT
FALL
H1
C1
FALL
H2
1 POWER SUPPLY. PROVIDE DISCONNECT
MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 122. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
60-2485—8
2
H1/C1
ANTICIPATOR
3
4
5
H2
ANTICIPATOR
6
SUBBASE
FAN
SWITCH
AUTO
ON
EM. HT. LED
SYSTEM
(YELLOW)
SWITCH
EM. HT.
HEAT
OFF
COOL
142
SYSTEM COMPONENTS
G
R
W2
K
L
CO
C
SERVICE
LED (RED)
Y
W1
Z
SERVICE
FAN RELAY
L2
1
L1
(HOT)
AUX. HT. RELAY
EM. HT. RELAY
COMPRESSOR
CONTACTOR
CHANGEOVER
VALVE
M8379