Aprilaire 8552 - Manual (Page 21)

Optional Settings For
Additional Thermostat Features
The Model 8552 thermostat is equipped with 3 DIP switches located inside the thermostat on the
printed circuit board. These switches are preset by the factory to typical home heating and air
conditioning system requirements. The installing contractor also reviewed the settings during installation
to be sure the thermostat will operate properly with your heating and air conditioning 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 8552 DIP switches control the following functions:
No. 1 – 4 min. / 2 min. Minimum Equipment On / Off Times. This switch is factory preset at 2 minutes.
This switch provides short cycle protection for the furnace and air conditioning unit. If you feel
that the furnace or air conditioning system turns on and off too many times per hour, ask your
contractor about changing the switch to a 4 minute minimum on time. Keep in mind however that
this may increase the overall temperature variation in the house due to longer run and off times.
DO NOT change the position of this switch without first consulting with your contractor.
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