Specifications

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Discharge Air Temperature (DAT) Sensor
The DAT sensor is typically factory installed at the inlet of the blower housing and connected to
IN-6 of the FHP-560/583 controller. For parallel coil applications it is best to locate a duct
mounted sensor in the supply air stream since supply air stratification can occur during 1st stage
operation. Supply duct sensor placement provides a better measurement of the discharge air
temperature due to the mixing process. Duct mounted DAT sensors are field installed by the
controls integrator and must be purchased as a separate item. Please consult with a factory
application engineer for specific duct sensor hardware. If supplemental heating is installed then
the DAT sensor will be mounted downstream of the discharge side of the heating coil.
High Discharge Air Temperature Condition (Cooling)
DAT measurements are tested for a high limit trip above 70°F. An alarm is asserted for high
discharge air temperature under the following conditions:
• DAT is above the high limit for 5 minute
• Fan Operation Asserted
• Cooling Mode
• Valid DAT sensor measurement
Low Discharge Air Temperature Condition (Heating)
DAT measurements are tested for a low limit trip below 75°F. An alarm is asserted for low
discharge air temperature under the following conditions:
• DAT is above the low level limit for 5 minute
• Fan Operation Asserted
• Heating Mode
• Valid DAT sensor measurement