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50Hz Quest 155
Installation, Operation and Maintenance Instructions
14
www.QuestClimate.com
7.7A Humidity Control
The humidity control is an adjustable switch that closes when the relative humidity of the air in which it is located rises to the
dial set point. It opens when the RH drops 4 to 6% below the set point. If the Quest Dehumidifier does not run, try turning the
humidity control clockwise until it reaches the stop and the knob pointer points at “Max Dry” (see back of control panel cover). If
it still does not run, remove the stop screw from the panel and turn the knob farther. If it then runs, the humidity control is out of
calibration or the RH is below 40%.
The Quest Dehumidifier is equipped with an automatic defrost mechanism. If the Quest Dehumidifier operates in conditions that
develop frost on the evaporator, it will sense the frost build-up and automatically defrost the evaporator. The Quest Dehumidifier
may not appear to be operating correctly during the defrost sequence, but once the defrost sequence is completed, the Quest
Dehumidifier will resume dehumidifying.
7.8 Defrost Thermostat
The defrost thermostat is attached to the refrigerant suction tube between the accumulator and the compressor. It will
automatically shut the compressor off if the low side refrigerant temperature drops due to excessive frost formation on the
evaporator coil. The impeller fan will continue to run, causing air to flow through the evaporator coil and melt the ice. When the ice
has melted, the evaporator temperature will rise and the thermostat will restart the compressor.
7.9 Condensate Pump Kit
An optional condensate pump kit is available from the factory for use with the Quest Dehumidifier. Condensate is automatically
pumped to a remote location when the water level in the pump's reservoir rises to close the float switch.
The pump also contains a safety float switch. The white leads from this switch extend from beneath the pump cover. This switch
should be installed in series with the field wire that connects the blue (#5) lead from the Quest Dehumidifier to the blue (#5) lead
on the control panel.
If the pump fails, this switch opens the compressor control circuit and stops water production before the reservoir overflows. The
Quest Dehumidifier will continue to ventilate or circulate air as normal, but will not dehumidify until this switch closes.
