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STEP 5 Adjust Fan Operation Switch, As Required
□ The thermostat fan operation switch, labeled
FUEL SWITCH (see illustration on page 17) is
factory-set in the "F" position. This is the correct
setting for most systems. If your system is an
STEP 6
□ The system on-time is factory-set for a warm
air, gas or oil heating system. If you are installing
it on another type of system, the system on-time
must be adjusted accordingly by setting screws A
and B on the back of the thermostat. Use the
heating system table shown in the illustration on
page 17 as a guide. The system on-time should
be optimized according to the type of system to
electric heat system, set the switch to "E." The
"E" setting will allow the fan to turn on immedi¬
ately with the heating or cooling in a system
where the "G" terminal is connected.
minimize room temperature swings. Setting the
screw "out one turn" means turning the screw
approximately 360° or one complete turn. Setting
the screw "in" means tightening the screw
completely down.
In the unlikely event that you want longer furnace
on-time, readjust screws A and/or B as follows:
Adjust System On-Time, As Required
16
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 - in).
•
Electric Furnace—Leave at the Warm Air Furnace setting (A - in, B - in).
NOTE: This thermostat does not have a
setting for steam/gravity air. Cycles
would not be long enough for accurate
temperature control.
- IMPORTANT-
When using a high efficiency
furnace such as a 90 percent or
greater AFUE (Average Fuel
Utilization Efficiency) unit, adjust
screw A OUT ONE TURN and
screw B IN.
THERMOSTAT BACK
17
INSTALLATION
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