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ADJUSTING HEAT ANTICIPATOR
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. 9):
1. Remove thermostat cover.
2. If heat cycle is too long, set heat anticipator to a
slightly lower dial setting (
1
⁄2 division).
3. If heat cycle is too short, set heat anticipator to a
slightly higher dial setting (
1
⁄2 division).
4. Replace thermostat cover.
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 of difference between the
indicator setting of the thermostat and actual room tem-
perature. If the disagreement is appreciable, however,
first make sure that the thermostat is properly located and
leveled. Then, if recalibration still seems necessary, pro-
ceed as follows:
To prevent electrical and/or equipment damage,
disconnect electrical power to the system until
recalibration is complete.
1. The anticipator’s heat may adversely affect thermo-
stat recalibration. To prevent this, disconnect electri-
cal power to the 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
7
⁄32” wrench onto hex
nut beneath bimetal. While holding temperature ad-
justment lever stationary, turn hex nut clockwise until
mercury shifts to the right end of the tube (see fig. 10).
4. Move temperature adjustment lever to lowest setting.
5. Replace thermostat cover. Wait 10 minutes for bi-
metal temperature to stabilize. Do not stand near the
thermostat during this period, as your breath and
body heat will affect bimetal temperature.
6. Move temperature adjustment lever to correspond to
actual room temperature. Then remove thermostat
cover.
7. Slip
7
⁄32” wrench onto hex nut. While holding tempera-
ture adjustment lever stationary, turn hex nut counter-
clockwise until mercury just barely shifts to the left
end of the tube (see fig. 10).
8. Replace thermostat cover and set temperature ad-
justment lever to desired temperature. Turn on elec-
trical power to system.
If you need further information about this product, write to us at:
WHITE-RODGERS DIVISION
Emerson Electric Co.
9797 Reavis Road
St. Louis, MO 63123-5398
Attn: Technical Service Department
CAUTION
!
CAUTION
!
.18
.25
.3
.4
.2
.15
1.
.8
.6
.5
Arrow points to the
matched current rating
of the primary control
Move this lever to
adjust heat
anticipator
Figure 9. Anticipator adjustment
L
O
N
G
E
R
C
Y
C
L
E
S
Bimetal
7
⁄
32
”
Calibration
wrench
Temperature
adjustment
lever
Figure 10. Calibrating thermostat