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73•dap4UserManual

In DX mode, 2-cooling stages off as follows:

Cooling 2 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.0°F AND

Humidity Setpoint - Humidity Deadband - 0%

Cooling 1 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.2°F AND

Humidity Setpoint - Humidity Deadband - 1%

In DX mode, 4-cooling stages on as follows:

Cooling 1 on when dewpoint = High Dewpoint Setpoint- 0.6°F OR Humidity Setpoint - 3%

Cooling 2 on when dewpoint = High Dewpoint Setpoint - 0.4°F OR Humidity Setpoint - 2%

Cooling 3 on when dewpoint = High Dewpoint Setpoint - 0.2°F OR Humidity Setpoint - 1%

Cooling 4 on when dewpoint = High Dewpoint Setpoint - 0.0°F OR Humidity Setpoint - 0%

In DX mode, 4-cooling stages off as follows:

Cooling 4 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.0°F AND

Humidity Setpoint - Humidity Deadband - 0%

Cooling 3 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.2°F AND

Humidity Setpoint - Humidity Deadband - 1%

Cooling 2 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.4°F AND

Humidity Setpoint - Humidity Deadband - 2%

Cooling 1 off when dewpoint = High Dewpoint Setpoint - High Dewpoint DB - 0.6°F AND

Humidity Setpoint - Humidity Deadband - 3%

ChilledWaterDehumidication

Chilled Water valve opening

Chilled Water valve will open if dewpoint is increasing OR relative humidity is increasing closer

to the setpoints. Either high dewpoint or high relative humidity can cause the CW to open and

 callfordehumidication.ThemodulationoftheCWvalvewillbebasedonwhicheverhas 

 higherdemandforCWvalvetoopen.Forexample,ifdewpointrequirestheCWvalvetoopen

20% and humidity requires the CW valve to open 50%, as a result, CW valve will open 50%.

Individual logic for CW valve opening based on dewpoint and humidity is as followes:

CW valve modulation based on dewpoint

  Dehumidicationmodewillstartifreturndewpointrisestohigh_dewpoint_setpoint–1.0°F;

after that, CW valve will:

   Open10%ifreturndewpoint=high_dewpoint_setpoint–0.9°F

   Open20%ifreturndewpoint=high_dewpoint_setpoint–0.8°F

   Open30%ifreturndewpoint=high_dewpoint_setpoint–0.7°F

   Open40%ifreturndewpoint=high_dewpoint_setpoint–0.6°F

   Open50%ifreturndewpoint=high_dewpoint_setpoint–0.5°F

   Open60%ifreturndewpoint=high_dewpoint_setpoint–0.4°F

   Open70%ifreturndewpoint=high_dewpoint_setpoint–0.3°F

   Open80%ifreturndewpoint=high_dewpoint_setpoint–0.2°F

   Open90%ifreturndewpoint=high_dewpoint_setpoint–0.1°F

   Open100%ifreturndewpoint=high_dewpoint_setpoint

CW valve modulation based on humidity

  Dehumidicationmodewillstartifreturn_relative_humidityrisestohumidity_setpoint– 

1.0%; after that, CW valve will:

   Open10%ifreturn_relative_humidity=humidity_setpoint–0.9%

Brand	Data Aire
Model	dap 4
Category	Control Unit
Language	English

Data Aire dap 4 User Manual

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Data Aire dap 4 Specifications