PKG-SVX029A-EN
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sequences to allow using outside air for the first stage of
cooling, in occupied or unoccupied mode and when
ambient conditions are favorable for economizing. Inherent
in the unit controller is the ability to suppress the setpoint
below the normal unit setpoint. This allows the building to
improve comfort levels when possible, and at the same
time, optimize building mechanical cooling operation for
peak operating efficiency. Outdoor and Return Air
temperature and relative humidity sensors are field sourced
and installed.
Economizer operation enables when the outside air
enthalpy is 3 BTU’s/lb. less than the return air enthalpy.
During occupied mode, the outside air damper opens to 15
percent(adjustable 0 to 100%) for ventilation purposes. An
analog 2 to 10 Vdc output is provided to modulate the field
provided and installed damper actuators.
Operating Principles
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