Vav One To Three Stage Electric Reheat No Fan; Temperature Control - ABB FBVi-2U4-4T User Manual

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
maximum Flowrate setpoint
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
If the activeAirflow (A250)
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:
If there is no discharge air temperature sensor configured, as heating demand rises from
o
0-100%, the stages of heat shall be enabled to maintain zone temperature setpoints. Flow
will maintain
If a discharge air temperature sensor is configured, the discharge air temperature shall be
o
reset upwards, displayed as
maxDischargeAirTempStpt (A323).
discharge air temperature setpoint. Flow will maintain
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maxCoolFlowStpt (A228)
is 50 cfm below the minHeatFlowStpt (A230),
minHeatFlowStpt (A230) setpoint.
dischargeAirTempStpt (A31)
The stages of heat shall be enabled to maintain a
FBVI-2U4-4T Contr
FBVi-2U4-4T |
minCoolFlowStpt (A227),
as required to maintain the zone at the cooling
minCoolFlowStpt (A227).
and the duct heat is digital,
to a maximum set at
minHeatFlowStpt (A230)
and its
setpoint.
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