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T87F ZONE THERMOSTAT AND 137421N,P WALLPLATES; T87F ZONE THERMOSTAT AND Q539A,B SUBBASES
11. Turn zone one thermostat dial 10°F (6°C) above
room temperature to end call for cooling.
12. Unless another thermostat is calling for cooling,
cooling and the fan shut off. All dampers then open
unless set to closed on the MM-2 or MM-3 panel.
FAN
1. Set the Fan switch on the zone one thermostat
subbase to On and the System switch to Off.
2. Observe that the fan runs continuously.
3. Move the Fan switch to Auto to control the fan
operation with the plenum fan control in heating
with the thermostat in cooling.
Independent Zone
• Use the T87F with the 137421N or P Wallplate for
heat-only independent zone applications.
• Use the subbase only to control heating and cooling of
independent zones.
• In this application, the T87F controls only the damper
actuator; the thermostat is not connected to the
heating or cooling equipment. A separate thermostat/
subbase is required to control the heating and cooling
equipment. See the thermostat instructions for
heating-cooling equipment checkout.
T87F THERMOSTAT/Q539B SUBBASE
1. With the heating equipment on and Q539B sub-
base System switch set to Heat, turn the thermo-
stat dial 10°F (6°C) above room temperature to call
for heat. The damper opens.
NOTE: The damper can take up to 30 seconds to fully
open or close.
2. Turn the thermostat dial 10°F(6°C) below room
temperature; damper closes.
3. With the cooling equipment on and the Q539B
Subbase System switch set to Cool, turn the ther-
mostat dial 10°F (6°C) below room temperature to
call for cooling; damper opens.
4. Turn the thermostat dial 10°F (6°C) above room
temperature; damper closes.
T87F THERMOSTAT/137421 WALLPLATE
1. With the heating equipment on, turn the thermostat
dial 10°F (6°C) above the room temperature to call
for heat; damper opens.
NOTE: Damper can take up to 30 seconds to fully open
or close.
2. Turn the thermostat dial 10°F (6°C) below room
temperature; damper closes.
Recalibration
The T87F is accurately calibrated at the factory under
controlled conditions and recalibration is not necessary. If
it appear that the thermostat is out of calibration:
1. Make sure the thermostat is level and not sub-
jected to radiant heat from the sun, radiators, or
appliances.
1. Remove the thermostat cover ring to observe the
mercury switch action.
2. After a five- or ten-minute off period (with thermo-
stat setting below room temperature), slowly raise
the setting until the switch just makes contact. If
the thermometer pointer and setting indicator have
the same reading the instant the switch makes, no
recalibration is necessary.
3. If recalibration is necessary: turn the setting dial a
few degrees above room temperature and remove
the cover.
4. Slip the 104994 Calibration Wrench (ordered sepa-
rately) onto the hex under the bimetal coil and,
holding the dial firmly, turn the hex clockwise until
the mercury breaks contact. See Fig. 6.
5. Turn the dial to a low setting so the thermostat
loses the heat it gained from hands and its own
operation. Wait at least five minutes.
6. Slowly turn the dial until the pointers have the
same reading.
7. Firmly holding the dial from turning, carefully turn
the hex counterclockwise until the mercury switch
slips to the heating contact end of the tube.
8. Recheck the calibration, select the desired temper-
ature, and replace the cover.
NOTE: When the T87F provides cooling control, cali-
bration for heating automatically calibrates for
cooling.
CAPTIVE
MOUNTING
SCREW (3)
Fig. 6. Recalibrating T87F Thermostat.
5
SETTING SCALE
ADJUSTABLE RANGE
STOPS ON SOME MODELS
CALIBRATION NUT
ROOM TEMPERATURE SCALE
HEAT ANTICIPATOR INDICATOR
M19049
69-0579-4
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