quest
Asset Protection and IAQ Solutions
quest
1-800-533-7533
Quest
DRY
150 Installation, Operation and Maintenance Instructions
0
www.thermastor.com
When the fan/filter switch is in the “ON” position, the motorized damper will open and the fan will run,
introducing outside air. The unit may or may not be dehumidifying in the ventilation mode, depending on
the humidity control setting. See Section 4.2 for humidity control operation.
4.1D Ventilation Timer and Humidity Control WITH Fresh Air AND Motorized Damper
Refer to sections 4.7 through 4.9C.
4.1E DEH 3000 Digital Control WITH Fresh Air AND Damper
Refer to Section 5.
4.1F DEH 3000 Digital Control WITHOUT Fresh Air
Refer to Section 5.
4.2 Humidity Control Adjustment
Set the humidity control to the desired humidity level for the structure. Turning the knob
clockwise results in a drier setting. See the back of the control panel cover for set points.
The dehumidifier will run continuously until the relative humidity (RH) is reduced to the
humidity control dial setting. Setting the humidity control to lower RH levels will NOT
increase the dehumidification rate; the unit will simply run longer to reduce the RH to the
setting. The Quest
DRY
150 unit (and refrigerant-based dehumidifiers in general) will reduce
a warm space’s RH to a lower level than that of a cool space. Therefore there is no benefit to
set the humidity control to excessively low levels in cool rooms; doing so will result in long
periods of ineffective dehumidifier run time. Settings below 45% are not recommended.
4.3 Fan/Filter Switch
Turning ON the fan/filter switch will cause the Quest
DRY
150 fan to run continuously,
whether the Quest
DRY
150 is dehumidifying or not. This function is desirable if the unit
is used for air circulation and filtration to achieve maximum indoor air quality. When the
switch is ON; air will be constantly filtered through the Quest
DRY
150 and circulated
throughout the structure. When the switch is OFF the fan will operate only when the
humidity control calls for dehumidification or when the ventilation timer calls for
ventilation.
4.4 Ventilation Timer
The ventilation timer controls the fan and the motorized fresh air damper. When the ventilation timer is
activated, the Quest
DRY
150 will circulate the indoor air, and bring in fresh air from outside. The ventilation
timer should be set for the required ventilation of the structure. The structure should be ventilated with fresh
air as suggested by applicable codes and standards or as required by the owner. The ventilation timer is an
electronic timer that displays the current time. This timer has battery backup, so it will not require resetting after
a power outage. Following a prolonged power outage the display of the timer will flash on and off indicating a
power outage has occurred. The one-minute time increments of the ventilation timer allow you to program the
ventilation of your structure to fit your schedule.
The ventilation timer allows six programs with each program having one
“ON”
and one
“OFF”
event. A
program allows the user to turn the ventilation on at a certain day and time, then it allows them to turn the
ventilation off at a certain day and time. Each of these programs can be repeated daily or weekly or during a
specified block of days. All six of the programs operate independently of each other. If the timer fails to operate
or operates erratically, check that the control panel receives 24Vac from the Quest
DRY
150. If 24Vac is present
at the control panel, reset the timer by pressing the reset button at the bottom center of the timer face. The
Figure 5:
Fan/Filter Switch
Figure 4:
Humidity Control
Adjustment Knob
FOR HVAC INSTALLER ONLY
