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programmed, the optional outdoor temperature sensor will work and the fan will turn on if the
FAN button is pressed. To avoid frozen water pipes, DO NOT use the OFF mode for long periods
of time during sub-freezing temperatures.
NOTE: After selecting a new mode, the thermostat initiates a delay of up to 4 minutes to protect the heating and
cooling equipment.
Optional Settings For Additional Thermostat Features
The Model 8555 thermostat is equipped with 8 DIP switches located inside the thermostat on the printed
circuit board. These switches are preset by the factory to typical home heating and cooling system
requirements. The installing contractor also reviewed the settings during installation to be sure the
thermostat will operate properly with your heating and cooling system.
The DIP switches can however be changed to customize the thermostat’s operation to your particular
needs. This should only be done after consulting with your contractor.
The Model 8555 DIP switches control the following functions:
No. 1 – 4 or 2 Events Per Day. The switch is factory preset for 4 events per day; Morning, Day, Evening,
and Night. If it is more convenient you can select a 2-event day, Morning and Night, by moving this
switch to the ON position.
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