Quest DRY 105, 155, and 205
Installation, Operation and Maintenance Instructions
1-877-420-1330
18
www.QuestProtect.com
FOR HVAC INSTALLER AND OWNER
NOTE: NEVER use the compressor to evacuate the system or any part of it.
8.6C Replacing a Compressor, Nonburn Out
Remove the refrigerant from the system. Replace the compressor and liquid line filter/drier. Charge the system to 50 PSIG and
check for leaks. Remove the charge and weigh in the refrigerant quantity listed on the nameplate. Operate the system to verify
performance.
8.7 Remote Controls
The Quest Dry is controlled by devices mounted on a panel that is remote from the unit. You may or may not have the devices
listed below depending on the model of the remote control panel you purchased. If the Quest Dry fails to operate as desired,
always check the settings of the controls to insure that they are correct. Check that the controls are receiving 24Vac from the
Quest Dry. Check the connections between the Quest Dry, the control panel, and the field control wiring.
8.7A 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 Dry 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 Dry is equipped with an automatic defrost mechanism. If the Quest Dry operates in conditions that develop frost
on the evaporator, it will sense the frost build-up and automatically defrost the evaporator. The Quest Dry may not appear to
be operating correctly during the defrost sequence, but once the defrost sequence is completed, the Quest Dry will resume
dehumidifying.
8.7B Programmable Ventilation Timer
The ventilation timer controls the impeller fan and the motorized fresh air damper. When the ventilation timer is activated, the
Quest Dry 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 Dry 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 Dry 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.
8.8 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.
8.9 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 sufficient time for the damper to cycle. The damper
