PS4000/PS5000 Touchscreen Programmable Thermostat
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System and Fan Settings
System
The SYSTEM key selections vary based on your heating and/or cooling system type.
HEAT
Thermostat controls the heating system.
OFF
Both heating and cooling systems are off.
COOL
Thermostat controls the cooling system.
AUTO
Thermostat automatically changes between heating and cooling operation,
depending on indoor temperature.
EMER
Emergency heat cycles to maintain temperature. Compressor is locked out (used
only for 2H/1C or 3H/2C heat pump systems) and auxiliary heat turns on as second
stage if needed. (PS5000 ONLY.)
FAN
The Fan key selections vary based on the heating and/or cooling system type.
ON
Fan runs continuously. Use this setting for improved air circulation or for more
efficient central air cleaning.
AUTO
Fan follows the fan program schedule.
CIRC
Fan runs randomly approximately 35% of the time when there is no call for
cooling or heating. Use this setting for improved air circulation or for more efficient
central air cleaning when you do not want the fan running continuously.