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Quest 105/155/205/ 225 Dual Installation, Operation and Maintenance Instructions
14
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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 Dual 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 Dual Dehumidifier is equipped with an automatic defrost mechanism. If the Quest Dual Dehumidifier operates in
conditions that develop frost on the evaporator, it will sense the frost build-up and automatically defrost the evaporator. The
Quest Dual Dehumidifier may not appear to be operating correctly during the defrost sequence, but once the defrost sequence is
completed, the Quest Dual Dehumidifier will resume dehumidifying.
7.7B Programmable Ventilation Timer
The ventilation timer controls the impeller fan and the motorized fresh air damper. When the ventilation timer is activated, the
Quest Dual Dehumidifier will circulate the indoor air, and bring in fresh air from outside. The ventilation timer should be set for
the required ventilation of the residence. The structure should be ventilated with fresh air as suggested by applicable codes and
standards.
If the Quest Dual Dehumidifier fails to ventilate as expected, check that the time on the timer is correct. For the timer to carry
out the program schedule, the slide switch in the upper left corner on the timer must be set to “AUTO”. The slide switch in the
upper right corner of the Quest Dual Dehumidifier must be set to “RUN”. Also check the programs on the timer to be sure that
the timer is calling for ventilation at the correct times. If the timer fails to operate or operates erratically, reset the timer; see
section 4.5 of this manual.
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 o 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 Electric Ventilation Damper
The electric ventilation damper is controlled by the ventilation timer. The damper will open when the ventilation timer is activated
to allow fresh air into the structure through the 6” diameter fresh air inlet duct. The electric ventilation damper will remain closed
when the ventilation timer is not activated to prevent over-ventilating the structure when the unit is dehumidifying or recirculating
the indoor air.
The electric ventilation timer operates on 24 VAC from the control circuit. DO NOT connect high voltage to the damper motor
or damage to the motor may result. DO NOT force the blade of the damper by hand or damage to the damper motor may result.
The damper opens in one direction only. The damper rotates very slowly, allow sucient time for the damper to cycle. The damper
will take approximately 1 minute to cycle from closed to open or from open to closed.
If the electric ventilation damper fails to operate:
1. Check that the wiring is correct and that voltage is present at the damper motor.
2. Check for any obstruction inside the damper. If the electric ventilation damper fails to operate after performing these checks, it
must be replaced.
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