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Adjustible Constant
Volume Heating |
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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.
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 Farenheit. The change
over element senses the lower supply temperature and returns control to the
room element.
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