Honeywell T87F User Manual page 3

HEAT ANTICIPATOR SETTING
If the T87F is used for 3-wire, spdt, heating-only
(series 20) control (Fig. 6), set the heat anticipator for 1.2
(far left end of scale). A fixed resistor type heater is
provided in the 137421A Wallplate for this application.
For other control applications, proceed as follows.
Adjust anticipator to match current rating of primary
control. Rating is usually stamped on the control name-
plate. Move the indicator to the marking that matches this
rating. Indicator may be moved with fingers or pencil point
through hole shown in Fig. 7. If the current rating is not
given, proceed as follows before mounting the thermostat:
1. Connect an ac ammeter of appropriate range (0 to
2.0A, for example) between the R and W terminals on the
wallplate or subbase.
2. Let the system operate for one minute before reading
the ammeter.
3. Move the anticipator indicator to match the amme-
ter reading.
Fig. 7—Setting heat anticipator current rating.
SCALE
HOLE SUITABLE FOR
PENCIL POINT
TO MOVE INDICATOR
.12
.15
LONGER
HEAT
ANTICIPATOR
INDICATOR
M1368
A slightly higher setting to obtain longer burner-on
times (fewer cycles per hour) may be desirable on some
systems.
RECALIBRATION
The T87F is calibrated at the factory and no recali-
bration should be necessary. If the thermostat is accurately
leveled and still appears to be out of calibration, order
104994A Calibration Wrench. Instructions for recalibrating
are furnished with the wrench.
HEATING
Turn down temperature setting to lowest point. If sub-
base or remote switching is used, move system switch to
HEAT position. Raise temperature setting until heating
equipment starts. This point should be at room temperature
as indicated on the thermometer. Turn back dial slowly.
Heating equipment should stop when dial has been turned
below room temperature.
COOLING
CAUTION
1. Do not operate cooling if outdoor temperature
is below 10° C [50° F]. Refer to manufac-
turer's recommendations.
2. Allow 5-minute off-time after compressor has
been run to avoid compressor damage.
If T87F controls cooling, move system switch (if used)
to call for COOL and lower setting until cooling equipment
starts. Raise setting above room temperature and cooling
system should shut down. Make certain all equipment
responds properly to the thermostat.
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