ABB CBV-2U4-3T User Manual page 52

Primary Air Flow Reset Dehumidification
• Local Dehumidification Sensor
If the local ZoneRHValueCV
modulate up to the
calculation can be determined from point
heat mode, the heat will stage on accordingly. If heating demand is greater than 95%, however, the
calculated LocalRemoteSlaveDehumidCalc
Remote Dehumidification Sensor
•
If the CBV-2U4-3T(-N)
users can write the dehumidification calculated demand to the
configured for remote dehumidification, this will calculate the Flowrate setpoint in the same manner as if it
had a local relative humidity sensor.
Calculated Flowrate Alarms
If the calculated Flowrate goes above or below the
setpoint, default 75 Flowrate, then a delay timer will be started
minutes. If the calculated Flowrate has not corrected before the time delay, an alarm will be generated.
Additionally, if there is a low Flowrate alarm condition
alarm condition AlarmEncode
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CBV-2U4-3T(-N) |
(A13) goes above the
TABPriAirMaxStpt (A211), or maximum Flowrate setpoint. Dehumidification demand
LocalRemoteSlaveDehumidCalc
(A76) will be limited to 70%.
is a slave VAV box and another controller is master and has a relative humidity sensor,
(A41) will be set to 8.
Control Sequence Overview
LocalDehumidStpt (A258), the primary air flow setpoint will
(A79). If the
RemoteSlaveDehumidCmd
EffPriAirFlowStpt (197) by the
CFMAlarmOnDelay
AlarmEncode (A41) will be set to 4. In a high Flowrate
CBV-2U4-3T(-N) is in
(A1). When
CFMAbvBlwSPAlarm (A7)
(A373), default 30
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