Data Aire gForce Ultra User Manual page 114

 Variable speed compressor C1 starts to ramp down in 0.1 % RH decrement when
Humidity drops to Humidity Setpoint + 1%. Compressor decreases 10% speed
for each 0.1% RH.
 When Humidity equals Humidity Setpoint, compressor runs at its minimum speed
(0 VDC).
 When Humidity is at Humidity Setpoint – 0.5% and compressor minimum
runtime expired, compressor turns off (NO2 start signal turns off).
9.4.1.2 Dual DX circuit with a variable speed compressor and a fixed speed compressor.
Dehumidification cycles on
 If the 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 = Humidity SP + Hum Deadband, C1 will run at 0%
 If Humidity = Humidity SP + Hum Deadband + 0.1%, C1 will run at 10%
 If Humidity = Humidity SP + Hum Deadband + 0.2%, C1 will run at 20%, etc.
 C2 fixed speed compressor cycles on at Humidity setpoint + Humidity
deadband+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 satisfies but not to violate the dehumidification inhibit logic (In
limit/ No limit) stated above.
 If unit is in cooling mode and dehumidification mode is set to "1C in Limit" or "2C
in Limit", the temperature cooling control mode will override the dehumidification
control (cooling control will follow the temperature setpoint). Otherwise, dap4™
will continue to finish the dehumidification cycle then reverse to Temperature
Control Cooling Mode.
Dehumidification cycles off
 When humidity drops, fixed speed compressor C2 (NO3) will turn off when
humidity = Humidity Setpoint +1%.
114 ● gForce Ultra User Manual 10-2014