Honeywell T874 Product Data page 213

THERMOSTAT
H1 ANTICIPATOR
H2 ANTICIPATOR
H1
FALL
FALL
H2
RESET
RISE
CO
C1 ANTICIPATOR
RISE
C1
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
REMOVABLE JUMPER (INSTALLED).
2
Fig. 229. Schematic and hookup of T874G with Q674F. Used in heat pump applications.
THERMOSTAT
H1
ANTICIPATOR
C ANTICIPATOR
H1
C
FALL
H2
ANTICIPATOR
H2
FALL
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND
OVERLOAD PROTECTION AS REQUIRED.
Fig. 230. Schematic and hookup of T874R with Q674L. Used in heat pump applications.
SUBBASE
1
FAN
SWITCH
2
AUTO
ON
3
4
5
6
SYSTEM
SWITCH
8
OFF
EM. HT.
9
HEAT
10
COOL
AUTO
11
SUBBASE
1
FAN
SWITCH
2
AUTO
ON
3
SYSTEM
SWITCH
4
EM .HT.
HEAT
5
OFF
6
COOL
11
213
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
R
COMP. RELAY
Y1
G
SERVICE
L
LED (RED)
O.D.S.
2
W1
EM. HT.
E
AUX. HT.
EM. HT.
LED
LED (YELLOW)
(GREEN)
C
T
O
COOL CHANGEOVER
VALVE
SYSTEM COMPONENTS
W3
O
COOL
CHANGEOVER VALVE
L
CHECK
LED (RED)
COMPRESSOR
MONITOR
G
R
W2
AUX. HT. RELAY
EM. HT.
LED
(RED)
E
AUX. HT.
LED
(GREEN)
X
B
HEAT
CHANGEOVER VALVE
Y
COMPRESSOR
RELAY
SYSTEM COMPONENTS
L1
(HOT)
1
L2
HI. PRO
O.L. IN. STAT.
FAN RELAY
SERVICE
EM. HT. RELAY
ELECTRIC
HT. RELAY
ELECTRIC
HT. RELAY
C815A OUTDOOR
THERMISTOR
M3264
W3 RELAY
FAN RELAY
1
L1
(HOT)
L2
EM. HT. RELAY
M5068
60-2485—8