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Quest PowerDry 385D Pro
Installation, Operation and Maintenance Instructions
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If your location requires the use of an extension cord, use safe techniques in selection and connection. Such cords
must be grounded and rated for carrying 11 amps: 14 gauge minimum for one extension less than 25ft in length or
12 gauge for one extension less than 50ft in length.
2.6 Control Panel
2.6A Power Switch
The PowerDry 385D Pro has one control device, the power switch. When the power switch is moved to the “on”
position your portable desiccant is dehumidifying. The machine will continue to dehumidify in all conditions until
the power is turned off: There is no dehumidistat (see over-dry warning section 2.2).
2.6B Pilot Light
The power indicator lamp illuminates to indicate that the PowerDry 385D Pro is functioning properly. This
indicator is helpful when a job site is too noisy to know what equipment is running properly. At a glance from
across the room the operator can verify that the PowerDry 385D Pro is operating as it should.
2.6C Hour Meter
The hour meter will run whenever your PowerDry 385D Pro is on. This digital hour meter measures the cumulative
time of operation in one-tenth hour increments. This non-resettable time is often used to verify hours on a job or to
schedule maintenance. When the PowerDry 385D Pro is un-plugged the timer will continue to hold and display
the cumulative hours run.
2.7 Ducting Connections
Using excess duct length significantly reduces air flow volume through duct. This is true in any application. If the
job at hand needs a short length of duct, cut a section to the appropriate length. If air flow is restricted by excess
length, performance will suffer. The same can be said of excess bends in the ducting.
Three different duct sizes are used on the PowerDry 385D Pro. All ducting materials are available from Therma-
Stor LLC (see accessories list section 1).
Process in: 12” flex duct.
To attach flex duct to the process air intake, push the wire of the first couple of loops down below the four tabs in
the top cover.
Process out: 10” diameter lay flat plastic duct.
When inflated this ducting forms a 10” circle. 10” lay flat ducting attaches to the PowerDry 385D Pro by means of
a 12”x 6” wire rectangle. To attach lay flat ducting to the process exhaust air (Fig. 1, P5), put the plastic duct end
through the collar center and roll the plastic ducting’s end outward so that it overlaps the outside of the collar. The
duct and collar quickly attach to the PowerDry 385D Pro by snapping over the four screw posts surrounding the
process air exhaust (Fig. 1, P5).
Reactivation in & out: 6” flex duct.
Both reactivation air streams use the same type of duct connections.
The 6” flex ducting connections on the PowerDry 385D Pro consist of a detachable 6” starting collar. Slide 6” flex
ducting over the starting collar and zip-tie or duct tape in place. To remove the starting collar (and its attached
ducting length) depress the snap button and rotate the duct collar 15° clockwise. After rotating pull the duct collar
straight out from the cabinet. Flex duct and collar may be stored beneath top cover.
