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T874 MULTISTAGE THERMOSTATS AND Q674 SUBBASES
173 60-2485—8
Fig. 166. Schematic and hookup of T874D with Q674F. Used in standard applications.
H1
FALL
L1
(HOT)
L2
1
H1 ANTICIPATOR
1
OFF
EM. HT.
SYSTEM
SWITCH
FAN
SWITCH
HEAT
AUTO
COOL
ON
AUTO
M5728
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.
1
SYSTEM COMPONENTSSUBBASETHERMOSTAT
H2
FALL
C1
RISE
C2
RISE
4
6
8
9
10
11
X
W1
W2
Y2
L
RH
E
G
Y1
RC
L1
(HOT)
L2
1
HEAT RELAY 1
HEAT RELAY 2
EM. HT. RELAY
FAN RELAY
COMRESSOR CONTACTOR 1
AUX. HT. LED
(GREEN)
EM. HT. LED
(RED)
COMRESSOR CONTACTOR 2
SYSTEM
MONITOR
C1 ANTICIPATOR
C2 ANTICIPATOR
H2 ANTICIPATOR