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Quest DEH 3000R
Installation, Operation and Maintenance Instructions
12
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3.8 Damper Operation and Ventilation,
Manual (Hold) Mode
The “VENT” setting controls the ventilation function of the system. It has no control over the dehumidification
function. In order to provide ventilation, the motorized damper must be open and the fan must be running. The
controller takes care of these two functions automatically so that whenever the damper is open, the fan is running.
The ventilation indicator “O” will be displayed whenever the unit is ventilating. The fan operation indicator “O”
will also be lit.
There are three damper operation modes:
1. “OPEN” – hold mode: The damper will be open and the dehumidifier fan will be continuously operating to
introduce fresh air into the space. Use this mode for continuous fresh air ventilation. The fan is always on when
the damper is open.
2. “CLOSED” – hold mode: The damper will never open, and the dehumidifier will not ventilate. The fan will still
operate normally for recirculation and dehumidification.
3. “PROGRAMMED” mode: The Quest DEH 3000R will operate the motorized damper and the dehumidifier fan
according to the programmed ventilation schedule (Section 3.9).
The factory preset for the “VENT” setting is “CLOSED”.
To set “OPEN” – hold or “CLOSED” – hold ventilation operation:
1. Press the “VENT” button. The current setting will begin to flash on the display. Release the button.
2. Press the “VENT” button again to switch between “OPEN” and “CLOSED”.
3. Leave the control alone for 10 seconds and your settings will be saved.
Damper Operation and Ventilation, Programmed Ventilation
This example shows the system in program mode (denoted by the schedule 15 minutes on, 5 minutes off and the
word RUN in the lower right corner of the display).
The Quest DEH 3000R will operate fresh air ventilation according to your
ventilation program. The control needs to be programmed to turn the
ventilation function ON and OFF at the desired intervals. This is done by
programming the ventilation timer.
There are two programs available for ventilation:
1. Monday through Sunday
2. Monday through Friday & Saturday/Sunday
Each block of days has a morning schedule and a night schedule. Morning
is the first 12 hours of the day and night is the second 12 hours.
Each schedule has:
• A “START” time when the ventilation schedule begins,
• An “OPEN FOR” duration for the amount of time the damper stays open in 5 minute intervals, from 0 to 60,
• And “CLOSED FOR” duration which closes the damper for a specified time in 5 minute intervals from 0 to 60.