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Display / Keypad Operation
The thermostat’s display has four distinct fields. These fields are the Menu field, the Item field, the Number field and
the Status field. The four buttons on the face of the thermostat are used to navigate through the menus and items to
view and / or adjust the desired settings.
General
These thermostats have electronic circuitry that not only is
“reading” the room temperature and / or the external sensor
(typically a floor sensor) but also is monitoring the heating
cycles and accumulating a “knowledge” of just how the
heating system is working. This allows the thermostat to
“anticipate” the system and prevent a system “short cycling”.
In order to prevent short cycling of the heating relay(s), the
thermostat ensures that the relay(s) remains on or off for a
minimum amount of time. In order to prevent short cycling of the Cool relay, the minimum cooling on time and
minimum cooling off time settings are adjusted in the Adjust menu of the PD2.
An Auto Cycle setting is available for both the heating cycle and the cooling cycle. This setting allows the thermostat
to determine the best number of cycles per hour that balances both temperature swings and equipment cycles.
