Honeywell T874 Product Data page 217

THERMOSTAT
H1 ANTICIPATOR
FALL
H2 ANTICIPATOR
H1
H2
FALL
C1
RISE
C1 ANTICIPATOR
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
Fig. 237. Schematic and hookup of T874C with Q674B. Used in standard applications.
THERMOSTAT
1
H1
ANTICIPATOR
2
FALL
H1
4
6
H2
ANTICIPATOR
FALL
H2
8
C1
RISE
C1
ANTICIPATOR
10
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
2 FACTORY INSTALLED JUMPER BETWEEN TERMINALS W1 AND Y1.
Fig. 238. Schematic and hookup of T874C with Q674F. Used in heat pump applications.
1
FAN SWITCH
AUTO
2
ON
3
4
5
SYSTEM
SWITCH
6
HEAT
8
OFF
COOL
10
SUBBASE
FAN SWITCH
AUTO
ON
SYSTEM
SWITCH
AUX. HT.
HT. PUMP
2 STAGE HT.
OFF
COOL
217
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
SUBBASE
CHECK
LED (RED)
AUX. HT.
LED (RED)
SYSTEM COMPONENTS
L1
R
(HOT)
L2
1
FAN RELAY
G
B
LOW LED
(YELLOW)
HEAT 1
W1
HI LED
(GREEN)
HEAT 2
W2
COMPRESSOR
CONTACTOR
Y
M7716
SYSTEM COMPONENTS
X
G
FAN RELAY
L1
(HOT)
R
L2 1
B RELAY
B
HEAT PUMP
RELAY
W1
AUX. HT.
RELAY
W2
C
COOL
2
CHANGEOVER
VALVE
O
Y1
COMPRESSOR
M7719
CONTACTOR
60-2485—8