Lux Products P621U operating instructions Advanced Features

ADVANCED FEATURES:

TEMPERATURE SWING AND OFFSET SETTING: A thermostat works by turning your heating or cooling system on and off whenever the room temperature varies from the desired set-point temperature. The amount of this variation is called the swing. Generally your system should cycle on about 3 to 6 times per hour. A smaller swing number makes the system cycle more frequently, so the room temperature is more precise and constant. A larger swing number will make the system remain on for a longer duration each time and decreases the number of cycles per hour. There is only one Swing setting, and this determines the cut-in and cut-out points for both the first and second stages (if present), in both Heat mode and Cool mode.

NOTE: The Swing and Offset settings need to be performed in a timely manner, as the thermostat will timeout and automatically exit these adjustment screens after approximately 10 seconds without a button press.

TO CHANGE THE SWING SETTING: Ensure that the System Mode switch is in the OFF position and the Set Slide switch is in the RUN position. Press and hold the HOLD button for at least 5 seconds. The words “SET” and “SWING” will appear on the screen, along with a single flashing digit. Use the UP/DOWN buttons to change the number value between 1 and 9 (0.25F to 2.25F, in 0.25F degree increments). Number 1 is the default setting. Press the NEXT button to accept the swing setting and proceed to the OFFSET setting.

TO CHANGE THE OFFSET: After the Swing value has been accepted, the words “SET” and “OFFSET” will be shown on the screen, along with a flashing digit. This setting is shown as a number of degrees, and is similar in nature to the Swing however this only effects the operation of the second (auxiliary) heating stage, if present. The setting range for Offset is from 0 to 9 degrees. When set to 0 degrees, the second heating stage is completely disabled while in regular Heat mode (Emergency Heat mode will still function for heat pump configurations). An Offset value from 1 to 9 degrees will determine the number of degrees from the set point that will be required for the second heating stage to turn on. This setting can be used to conserve energy in situations where the second heating stage is more costly to operate when compared to the first stage.

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