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71•dap4UserManual

4.ThehumidicationstagingsequenceofeachadjustmentperiodforON/OFFofnon-modulating

humidiersisasfollows:

HumidierisONatHumiditySetpoint–HumidityDeadband

HumidierisOFFatHumiditySetpoint–1.0%

5.Thehumidicationstagingsequenceforamodulatinghumidierisasfollows:

Valve is OPENED at Humidity Setpoint – 1.0%

Valve is CLOSED at Humidity Setpoint – 0.5%

6.Whenthehumidiervalveisopened,itspositionwillfollowalinearrampthatgoesfrom25%

open with the humidity at setpoint minus 0.5% to 100% open at setpoint minus humidity dead-

band.

DEHUMIDIFICATION

1.DehumidicationModecanbeprogrammedwithoneortwocompressorsfordehumidication

and with or without reheat limits (See Menu J – Factory Settings).

2.Ifdehumidicationisprogrammedfor“WithinReheatLimits”dehumidicationcoolingwillbe

inhibited if the return air temperature drops to temperature setpoint minus temperature dead-

 bandminus2°F.Dehumidicationwillbeinhibiteduntilthereturnairtemperaturerisestothe

temperature setpoint. Compressor short-cycle time will not be violated.

3.Ifdehumidicationisprogrammedfor“NoReheatLimits”itwillremainONuntilthehumidity

 setpointisreached.Inthismodedehumidicationhaspriorityandovercoolingisdisregarded.

The reheat sequence will remain the same.

4.Ifdehumidicationisprogrammedfortwo(2)compressors,withorwithoutreheatlimits,only

one (1) compressor will be allowed if reheat is required.

5.Thereisaone(1)minutedelaybetweenstop-to-startofdehumidication.Compressorshort-

cycle time delay will not be violated.

6.Thereisave(5)minutedelaybetweendehumidicationandhumidication.

7.Thecompressorstagingsequencefordehumidicationateachadjustmentperiodisasfollows:

UNITS WITH STANDARD (DUAL) SCROLL COMPRESSORS

Cool 1 ON at Humidity Setpoint + Humidity Deadband

Cool 2 ON at Humidity Setpoint + Humidity Deadband + 1%

Cool 2 OFF at Humidity Setpoint + 1%

Cool 1 OFF at Humidity Setpoint

UNITS WITH OPTIONAL TANDEM SCROLL or SEMI-HERMETIC (W/UNLOADING) COMPRESSORS

Cool 1 ON at Humidity Setpoint + Humidity Deadband

Cool 2 ON at Humidity Setpoint + Humidity Deadband + 1%

Cool 3 ON at Humidity Setpoint + Humidity Deadband + 2%

Data Aire dap 4 User Manual

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