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Quest 215 Dual
Installation, Operation and Maintenance Instructions
15
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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 215 Dual 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 215 Dual 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 215 Dual. Check the connections between the Quest 215 Dual, 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 215 Dual 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 215 Dual is equipped with an automatic defrost mechanism. If the Quest 215 Dual operates in conditions that develop
frost on the evaporator, it will sense the frost build-up and automatically defrost the evaporator. The Quest 215 Dual may not
appear to be operating correctly during the defrost sequence, but once the defrost sequence is completed, the Quest 215 Dual 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 215 Dual 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 215 Dual 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 215 Dual 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.
