Honeywell T874 Product Data page 201

THERMOSTAT
H1
FALL
H1 ANTICIPATOR
C1 ANTICIPATOR
C1
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 214. Schematic and hookup of T874A with Q674B. Used in standard applications.
SUBBASE
1
SYSTEM
SWITCH
HEAT
2
OFF
COOL
3
4
FAN
SWITCH
5
LO
MED
HIGH
ON
11
12
201
T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
H1
R
O
L
C
CHECK
LED (RED)
Y
G1
G2
SYSTEM COMPONENTS
L1
(HOT)
L2
1
AUX. HT. RELAY
R1 RELAY
COOL
CHANGEOVER
VALVE
R2
RELAY
N.O. 1
COMPRESSOR
CONTACTOR
COMPRESSOR
CONTACTOR S1 RELAY N.C.
K1 RELAY
K2 RELAY
M2992
60-2485—8