Operating Instructions
17
DryCool HD Operator and Maintenance Manual
P00960167-1
4. Operating Instructions
4.1. Controls
The DRYCOOL™ HD can be equipped with various accessories to enhance its operation. A remote humidistat
must be used with the unit.
Please
NOTE
: Humidistat is not included. If purchased from Munters the humidistat will be supplied loose with
dehumidifier.
4.1.1. Humidity Control Adjustment
Set the humidity control to the desired humidity level for the structure. Turning knob clockwise on the humidistat
results in a drier setting.
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 unit’s dehumidification rate; the unit
will simply run longer to reduce area’s RH to the setting. The DRYCOOL™ HD (and refrigerant based
dehumidifiers in general) will reduce a conditioned space’s RH to a lower level. Settings below 40% are not
recommended.
4.1.2. Fan/Filter
Switch
Turning ON the fan/filter switch on side of unit will cause the internal fan to run continuously, whether the unit is
dehumidifying or not.
This function is desirable if 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 unit and circulated throughout house. When switch
is OFF; fan will operate only when humidity control calls for dehumidification.
The unit, long with either the high efficiency filter and/or the Germicidal UVC, can be used to perform total Indoor
Air Quality control for your structure.
4.2. Sequence of Operation
The ERV unit utilizes a humidistat to cycle the capacity on, when the humidity in the space is high and to cycle
the capacity off when the space humidity is at the desired condition.
If the humidity level in the space exceeds the control set point, the unit goes into dehumidification mode and the
HoneyCombe® desiccant dehumidifier wheel and DX cooling coils are energized. The desiccant wheel motor
is energized to rotate the wheel through the supply and reactivation air streams at a rate of 0.1 RPM. The
supply fan draws process air through the evaporator coil and the desiccant wheel. The reactivation air fan is
energized to draw outside air through the condenser coil and then through the desiccant wheel. The heat
rejected from the condenser coil heats up the reactivation air stream and drives the moisture from the desiccant.
This regeneration air is discharged to the outside atmosphere. The dehumidification process is continuous as
the desiccant wheel rotates through the supply and reactivation air streams. When the humidity in the space
returns to its control set point, the desiccant wheel and DX cooling system are de-energized. It should be noted
that the supply fan can be manually switched from “AUTO” to “ON” by pressing the switch on the side of the
unit.
