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Units equipped with the optional constant volume heating
feature have a change-over thermal element located on the operating mechanism
in the neck of the unit. Damper opening adjustment in the heating cycle is
provided on the face of the unit under the appearance panel. It is accessed by
sliding the appearance panel back exposing the controls. The constant volume
heating adjustment sets the damper opening and volume when the unit is in the
heating cycle. The adjustability is from a full closed to a full open damper
position. |
The unit goes into the heating mode when the supply air
temperature is 78 degrees or higher. The change over element senses the
elevated supply air temperature and opens the damper to the pre-set volume set
by the constant volume heating damper adjustment. The unit will switch back to
VAV cooling when the supply air temperature drops below 70 degrees Fahrenheit.
The change over element sense the lower supply temperature and returns control
to the room element. |
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