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85•dap4UserManual

 -- Ifunitisincoolingmodeduringdehumidicationcycleanddehumidicationmode

is set to “1C in limit”, the cooling control (By temperature setpoint) will override the

  dewpointcontrol.Ifdehumidicationmodeissetto“1CNoLimit”,unitwillcontinue

  tonishthedewpointcontrolcyclethenreversetothecoolingcontrol.

 Dehumidicationcyclesoff-Dewpointisdropping

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

dewpoint drops to high dewpoint Setpoint – high dewpoint deadband.

-- Compressor will run at minimum speed (0V) when dewpoint is at high dewpoint

setpoint – high dewpoint deadband-1°F.

-- Compressor turns off (NO2 start signal turns off) when dewpoint equals to high

dewpoint setpoint – high dewpoint deadband-1.5 deg F and compressor minimum

  runtimehasexpired.

b) DualDXcircuitwithavariablespeedcompressorandaxedspeedcompressor

 Dehumidicationcycleson–dewpointisrising

-- If unit is not in cooling mode, If dewpoint continues to rise, the variable speed

compressor will turns on when dewpoint = High dewpoint SP- 1Deg F and operates

at minimum speed (0V) then modulates 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.

 -- C2xedspeedcompressorwillcycleonwhendewpoint=highdewpointsetpoint.

-- 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 operate until

dewpoint drops below High dew setpoint – High DP DB-1 Deg F but not to violate

  thedehumidicationinhibitlogic(Inlimit/Nolimit)statedabove.

 -- Ifcoolingisonduringdehumidicationcycleanddehumidicationmodeissetto“2C

in limit” or “1C in limit”, the temperature cooling control will override the dewpoint

  control.Ifdehumidicationmodeissetto“1CNoLimit”or“2CNoLimit”theunitwill

  continuetonishthedewpointcontrolcyclethenreversetothetemperaturecontrol.

 Dehumidicationcyclesoff-dewpointisdropping

 -- C2xedspeedcompressor(NO3)willturnoffwhendewpoint=Highdewpoint

Setpoint – highdewpoint deadband.

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

dewpoint drops below High dewpoint Setpoint – High dewpoint deadband.

-- C1 compressor will run at minimum speed when dewpoint = High dewpoint SP-

dewpoint deadband-1°F.

-- C1 compressor turn off (NO2) when dewpoint = High dewpoint SP –dewpoint

deadband - 1.5 Deg F and variable speed compressor minimum runtime has

  expired.

Data Aire dap 4 User Manual

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