20 69-1385
In the unlikely event that you want a longer
furnace on-time, readjust screws A and/or B as
follows:
First, turn both screws in completely, then
adjust for system type:
• Warm Air Furnace—Set at the Hot Water
setting (A—out one turn, B—leave in).
• Electric Furnace—Leave at the Warm Air
Furnace setting (A—leave in, B—leave in).
NOTE: This thermostat does not have a set-
ting for steam/gravity air; cycles would
not be long enough for accurate tem-
perature control.
IMPORTANT
When using a high efficiency furnace
such as a 90 percent or greater Aver-
age Fuel Utilization Efficiency (AFUE)
unit, adjust screw A out one turn and
leave screw B in.
❑
The thermostat is set to read the temperature
in degrees Fahrenheit. If readings are
desired in degrees Celsius, adjust screw C
out one turn.
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