Airside Economizer Interface With Comparative Enthalpy - Trane Technologies IntelliPak Signature SCWF Installation, Operation And Maintenance Manual

Operating Principles
suppress setpoint below 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. An outside air
temperature and relative humidity sensor are provided for
field installation to monitor reference enthalpy. Economizer
operation enables when the outside air enthalpy is less
than 25 BTu/lb (adjustable 19-28 BTu/lb.). During occupied
mode, the outside air damper opens to 15% (adjustable 0-
100%) for ventilation purposes. Also, the ability to alter the
outside air damper position to compensate for VAV supply
air modulation is inherent in the unit controls, and can be
enabled by the operator. An analog 2-10VDC output
(adjustable (0-10 VDC) is provided to modulate the field-
provided 30 second damper actuators (adjustable 1-255
seconds).
Airside Economizer Interface with
Comparative Enthalpy
Units with airside economizer interface and comparative
enthalpy are equipped with the necessary control
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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. A factory-installed control board,
with outside and return air temperature and relative
humidity sensors, are provided for monitoring outside and
return air. The sensors are field 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% (adjustable 0-100%)
for ventilation purposes. Also, the ability to alter the outside
air damper position to compensate for VAV supply air
modulation is inherent in the unit controls, and can be
enabled by the operator. An analog 2-10 VDC output
(adjustable (0-10 VDC) is provided to modulate the field-
provided 30-second damper actuators (adjustable 1-255
seconds).
SCXF-SVX01T-EN