Sunlight Supply Quest PowerDry 4000 Pro Dehumidifier - Manual (Page 6)

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Quest PowerDry 4000 Pro Installation, Operation and Maintenance Instructions
6
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2.8 Humidistat
Adjust the humidistat to the desired conditioned humidity. The humidistat has a range of 20% to 70% RH.
“ON” will operate the unit continuously regardless of humidity.
2.9 Hours Button
Pressing the HOURS button displays the hour meter when the unit is turned off but plugged into power. To
reset job hours, press and hold the HOURS button for 5 seconds when the unit is operating.
2.10 Defrost Light
The DEFROST light turns on when the unit is in defrost mode indicating when the compressor is off.
DRYING TIP: Air’s ability to absorb moisture from wet surroundings and the Quest PowerDry 4000 Pro’s
ability to remove moisture from that air is greatly improved at higher temperatures. We recommend that
the area to be dried be heated to over 70°F if possible. Less drying time will be required and efficiency will
improve.
2.11 Defrost Cycle
If the evaporator coil’s refrigerant temperature drops below the defrost set point, due to excessive frost
formation, the thermistor activates the solid state control and the defrost light. The control cycles the
compressor “off” and “on” by monitoring thermistor temperature. The air mover will continue to run,
causing air to flow through the evaporator coil. The air will melt the ice that formed on the evaprator.
When the air temperature and/or humidity increases, the evaporator temperature will rise and the thermistor
will end the defrost cycle restarting the compressor.
If the evaporator temperature does not reach the desired temperature, the compressor will start after 15
minutes. The system will start a timed defrost cycle. The timed defrost cycle ensures the unit will continue
to remove water from the air in cool ambient conditions.
2.12 Low Pressure Control
If the low side refrigerant drops into a low pressure situation that may harm the compressor, the solid state
controls will sense the refrigerant conditions and shut off the compressor until the system automatically resets
itself.
The solid state control monitors the refrigerant conditions to ensure the system is protecting compressor
at all times. The control protects the compressor from damage by monitoring cycles, pressures, and system
performance.