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Locked Case - Concealed Dial:
This feature is for the purpose of preventing tampering
and unauthorized adjustments. A special wrench is pro-
vided to remove case for temperature adjustment.
On a fixed differential heating thermostat, turn the dial so
that the fixed indicator points to the temperature at which
it is desired to have the contacts open, thus turning off the
heat.
The contacts will then close at a temperature lower than
the dial setting, by the amount of the differential.
CAUTION
Disconnect electric power before removing con-
trol from wall.
LOCK SCREW
AT BOTTOM
OF CASE
FIXED DIFFERENTIAL
3
OPERATION
Figure 4
FIXED INDICATOR
Figure 5
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