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This thermostat is easy to operate. Fig.
10 shows how the heating/cooling sys-
tem and fan operate when the switches
are in various positions. Use the system
switch to select either heating or cooling,
or to turn the heating/cooling system off.
Use the fan switch to control fan opera-
tion. When the fan switch is in the AUTO
position, the fan will cycle with the heating
or cooling system (the fan will not run if
the system switch is in the OFF position
and the fan switch is in the AUTO posi-
tion). When the fan switch is in the ON
position, the fan will run continuously,
regardless of system switch position (even
if the system switch is set to OFF, the fan
will run if the fan switch is in the ON
position).
ADJUSTING HEAT ANTICIPATOR
CAUTION
!
The adjustable heat anticipator WILL BURN OUT
if 25 VAC is applied directly to the thermostat by
shorting out the primary control during testing.
This may cause personal injury and/or property
damage.
This thermostat is equipped with an adjustable heat
anticipator and was preset at the factory to provide
satisfactory operation of the heating system under normal
conditions. If additional adjustments are necessary, they
may be made as follows (see Fig. 11):
1. Remove thermostat cover.
2. If heat cycle is too long, set heat anticipator to a slightly
1
lower dial setting (
/
division).
2
3. If heat cycle is too short, set heat anticipator to a
slightly higher dial setting (
4. Replace thermostat cover.
.4
.5
.6
.8
1.2
Arrow points to the
matched current rating
of the primary control
Figure 11. Anticipator Adjustment
Shows switch position
FAN
AUTO ON
Figure 10. Subbase switching and thermostat/system operation
1
/
division).
2
.3
.25
.2
.18
.15
Move this lever to
adjust heat
anticipator
SYSTEM
COOL OFF HEAT
No heating; no cooling; no fan
No heating; no cooling; fan runs continuously
Cooling system cycles from thermostat; fan runs
continuously
Cooling system and fan cycle from thermostat
Heating system cycles from thermostat; fan cycles
from fan control on furnace
Heating system cycles from thermostat; fan runs
continuously
CALIBRATING THERMOSTAT
This thermostat has been carefully adjusted at the factory
and should not require recalibration.
Due to environmental conditions, during normal operation
there may be a few degrees difference between the
indicator setting of the thermostat and actual room
termperature. If the disagreement is appreciable, how-
ever, first make sure that the thermostat is properly
located and leveled. Then, if recalibration still seems
necessary, proceed as follows:
!
To prevent electrical shock and/or equipment
damage, disconnect electrical power to system
until recalibration is complete.
1. The anticipator's heat may adversely affect thermostat
recalibration. To prevent this, disconnect electrical
power to thermostat at the furnace, main fuse, or
breaker box.
2. Move temperature adjustment lever to a setting about
5° above room temperature.
3. Remove thermostat cover. Slip
nut beneath bimetal. While holding temperature ad-
justment lever stationary, turn hex nut clockwise until
mercury shifts to right end of tube (see Fig. 12).
4. Move temperature adjustment lever to lowest setting.
5. Replace thermostat cover. Wait 10 minutes for bimetal
temperature to stabilize. Do not stand near the thermo-
stat during this period as your breath and body heat will
affect bimetal temperature.
5
OPERATION &
MAINTENANCE
OPERATION
CAUTION
7
/
" wrench onto hex
32
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