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84•dap4UserManual

 Dehumidicationcycleson

-- If unit is not in cooling mode, C1 variable speed compressor turns on when humidity

is at Humidity Setpoint + Humidity Deadband then runs at its minimum speed (0V).

C1 compressor will modulate from 0% to 100% in 0.1% RH increment (10% speed

for each 0.1% RH). It will operate at 100% speed when humidity rises to Humidity

setpoint + Humidity deadband+ 1%. For instance:

If Humidity = Humdity SP + Hum Deadband, C1 will run at 0%

If Humidity = Humdity SP + Hum Deadband + 0.1%, C1 will run at 10%

If Humidity = Humdity SP + Hum Deadband + 0.2%, C1 will run at 20% Etc.

 -- C2xedspeedcompressorcyclesonatHumiditysetpoint+Humiditydead 

band+1.1%.

-- If space is overcool, reheat will come on based on temperature setpoint and C2

compressor will turn off. C1 variable speed compressor will continue to run

  untilhumiditysetpointsatisesbutnottoviolatethedehumidicationinhibitlogic

(In limit/ No limit) stated above.

 -- Ifunitisincoolingmodeanddehumidicationmodeissetto“1Cinlimit”or“2Cin

  limit”,thetemperaturecoolingcontrolmodewilloverridethedehumidicationcontrol

(cooling control will follow the temperature setpoint). Otherwise, dap4 will continue to

  nishthedehumidicationcyclethenreversetotemperaturecontrolcoolingmode.

 Dehumidicationcyclesoff

 -- Whenhumiditydrops,FixedspeedcompressorC2(NO3)willturnoffwhenhumidity

= Humidity Setpoint +1%.

 -- C1willrampuptomaximumspeedforamodulationdelayperiodwhenC2turnsoff.

-- Variable speed compressor C1 starts to ramp down in 0.1 % RH decrement when

Humidity drops to Humdity Setpoint + 1% (decreasing 10% speed for every

0.1%RH).

-- C1 compressor will run at its minimum speed when humidity = Humidity SP.

-- Compressor C1 turns off (NO2 signal off) when humidity = Humidity SP - 1% and

  compressorminimumruntimehasexpired.

B. Dewpoint control mode

ThehumidiercontrolmodeissettoDewpoint.Highdewpointsetpoint,lowdewpointsetpoint

and dewpoint deadbands are programmed on dap4- menu B - Setpoint.

a) Single Variable speed compressor system

 Dehumidicationcycleson-Dewpointtemperatureisrising

-- If unit is not in cooling mode, the variable speed compressor turns on when

dewpoint is at High dewpoint SP- 1Deg F and operates at minimum speed (0V) then

it will modulate from 0% to 100% in 0.1% increment if dewpoint rises to high

dewpoint setpoint. For instance:

If dewpoint = High dewpoint SP – 1 Deg F, compressor will run at 0% (0VDC)

If dewpoint = High dewpoint SP – 0.9 DegF, compressor will run at 10% (1V)

If If dewpoint = High dewpoint SP – 0.8 DegF, compressor will run at 20% (2V) Etc.

Data Aire dap 4 User Manual

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