VAV ONE TO THREE STAGE ELECTRIC REHEAT NO FAN
TEMPERATURE CONTROL
When the zone temperature is greater than the cooling temperature setpoint, the controller will enter
the cooling mode. The primary airflow rate will be varied between its minCoolFlowStpt (A227), and its
maximum Flowrate setpoint maxCoolFlowStpt (A228) as required to maintain the zone at the cooling
temperature setpoint. Once the zone temperature falls below the cooling temperature setpoint, it will
exit the cooling mode.
When the zone temperature is between the cooling and heating temperature setpoints, it will be in
Deadband or Vent Mode. The controller will maintain the minCoolFlowStpt (A227).
If the activeAirflow (A250) is 50 cfm below the minHeatFlowStpt (A230), and the duct heat is digital,
the heat will be disabled.
When the zone temperature falls below the heating setpoint, the controller will enter the heating mode.
• If no discharge air temperature sensor is configured, or DualMax control is not enabled:
o If there is no discharge air temperature sensor configured, as heating demand rises from
0-100%, the stages of heat shall be enabled to maintain zone temperature setpoints. Flow
will maintain minHeatFlowStpt (A230) setpoint.
o If a discharge air temperature sensor is configured, the discharge air temperature shall be
reset upwards, displayed as dischargeAirTempStpt (A31) to a maximum set at
maxDischargeAirTempStpt (A323). The stages of heat shall be enabled to maintain a
discharge air temperature setpoint. Flow will maintain minHeatFlowStpt (A230) setpoint.
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