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After mounting the thermostat, set the adjustable
heat anticipator(s) to match the respective
reading(s) recorded in step
1.2.8
STAGE TWO
ANTICIPATOR
HEATING CONTROL
Fig. 11. Adjustable heat anticipator scales.
Temperature Setting
Move the heating and cooling levers to the desired
positions. The minimum differential between the
heating and the cooling setpoints is 3°F (2°C), which
means the setting levers are designed so they
cannot be set closer together than 3°F (2°C).
NOTE: If adjustable lever stops are desired, order
4074ECK Bag Assembly, which contains a
brass insert, mounting screw, and two
adjustable stops.
Gently push the brass insert into the backside of the
T874 in the hole below the LED space.
Place the two stops on the face of the T874 in the
space below the LED.
Insert the mounting screw through the two stops,
and into the threaded hole of the brass insert. The
mounting screw pulls the brass insert up through the
back of the plastic base.
Loosen the screw so the stops can slide into the
desired position against the levers.
Tighten the screw. See Fig. 12.
T874A,D,R THERMOSTATS AND Q674B,D,F,Q SUBBASES
. See Fig. 11.
STAGE ONE
ANTICIPATOR
HEATING
CONTROL
MOVE INDICATOR TO
MATCH CURRENT RATING
OF PRIMARY CONTROL
M5069
HEAT
LEVER
ADJUSTABLE
LEVER STOP
BRACKETS
Fig. 12. Installing adjustable lever stops.
Subbase Setting
System switch settings control thermostat operation as
follows:
OFF: Heating and cooling systems are off. If the fan
switch is in the AUTO position, the cooling fan is
also off.
HEAT: Heating system is controlled by the thermostat.
Cooling system is off.
COOL: Thermostat controls the cooling system.
Heating system is off.
AUX. HEAT: Auxiliary heat is on. Cooling system is off.
HEAT PUMP: Both first and second stage heat are on.
Cooling system is off.
2 STG. HEAT: Second stage heat is on. Cooling
system is off.
7
HOLES FOR INSULATED
LOCKING LEVER SCREWS
COOL
HOLE WITH
LEVER
BRASS INSERT
BRACKET
TABS
MOUNTING
SCREW
BRACKET
SLOTS
M7346
69-0107—2
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