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THERMOSTAT
H1
ANTICIPATOR
H1
FALL
H2
FALL
H2 ANTICIPATOR
RISE
C1
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
1
POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
2
JUMPER RC, RH FOR SINGLE TRANSFORMER.
Fig. 5. Schematic and hookup for T874D Thermostat with Q674D Subbase.
THERMOSTAT
H1
ANTICIPATOR
H1
FALL
H2
FALL
H2 ANTICIPATOR
RISE
C1
C1 ANTICIPATOR
C2 ANTICIPATOR
C2
RISE
1 POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD
PROTECTION AS REQUIRED.
Fig. 6. Schematic and hookup for T874D Thermostat and Q674A Subbase.
THERMOSTAT
MOUNTING SLOTS (2)
THERMOSTAT
M5631
Fig. 7. Mounting thermostat on subbase.
T874D MULTISTAGE THERMOSTAT AND Q674A,D SUBBASES
NO FAN SWITCHING
NO SYSTEM SWITCHING
FAN SWITCH
1
AUTO
4
6
SYSTEM
SWITCH
8
HEAT
AUTO
9
COOL
10
11
SUBBASE
THERMOSTAT
MOUNTING POST (2)
O L
C O
8 0
7 0
6 0
5 0
8 0
7 0
6 0
5 0
A T
H E
CAPTIVE MOUNTING
SCREWS (2)
SUBBASE
SUBBASE
ON
SETTINGS
Set The Heat Anticipator
Move the indicator to match the current rating of the
primary control. See Fig. 8. When using the T874 Thermo-
stat with two stages of heating, set each heat anticipator to
match its respective primary control current draw. If you
cannot find the current rating on the primary control, or if
further adjustment is necessary, see Note and use the fol-
lowing procedure to determine the current draw of each
stage.
3
SYSTEM COMPONENTS
B
RH
W1
HEAT RELAY 1
W2
HEAT RELAY 2
2
Y2
COMPRESSOR
CONTACTOR 2
Y1
COMPRESSOR
CONTACTOR 1
RC
SYSTEM COMPONENTS
RH
HEAT RELAY 1
W1
HEAT RELAY 2
W2
G
FAN RELAY
Y2
COMPRESSOR
CONTACTOR 2
Y1
COMPRESSOR
CONTACTOR 1
RC
L1
(HOT)
L2
1
L2
1
L1
(HOT)
M5633
L1
(HOT)
L2
1
L2
1
L1
(HOT)
M11428
69-0774B—1
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