10-2014 gForce User Manual ● 115
Variable speed compressor C1 starts to ramp down in 0.1 % RH decrement when
Humidity drops to Humidity 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.
9.4.2 Dewpoint Control Mode
The humidifier control mode is set to Dew point. High Dewpoint Setpoint, Low
Dewpoint Setpoint and Dewpoint Deadbands are programmed on dap4™ menu B -
Setpoint
9.4.2.1 Single Variable Speed Compressor System
Dehumidification 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 - 1⁰F 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 – 1⁰F, compressor will run at 0% (0VDC)
If Dewpoint = High Dewpoint SP – 0.9⁰F, compressor will run at 10% (1V)
If Dewpoint = High Dewpoint SP – 0.8⁰F, compressor will run at 20% (2V), etc.
If unit is in cooling mode during dehumidification cycle and dehumidification
mode is set to “1C in Limit”, the cooling control (by temperature setpoint) will
override the dewpoint control. If dehumidification mode is set to “1C No Limit”,
unit will continue to finish the dewpoint control cycle then reverse to the cooling
control.
Dehumidification 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 - 1⁰F
Compressor turns off (NO2 start signal turns off) when dewpoint equals to high
dewpoint setpoint – High Dewpoint Deadband - 1.5⁰F and compressor minimum
runtime has expired.
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