Introduction
2
DryCool HD Operator and Maintenance Manual
P00960167-1
Figure 2: Refrigeration System of DryCool™ HD
The DryCool™ HD operates cost-effectively because all of the energy required for the operation of the
desiccant dehumidifier cycle is recovered from the refrigeration components. The system 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.
Some benefits include, energy efficient and affordable dehumidification; environmentally friendly refrigerant
R-410a, compact size for installations in small spaces, assists in the prevention of mold, mildew and other
bacteria, low maintenance cost and fresh air ventilation.
1.2. Desiccant Wheel Operating Principle
1.
The “Heart” of the DryCool™ HD system is the HoneyCombe® desiccant wheel. The wheel has a series of
air passages or channels arranged in a honeycomb pattern. The honeycomb material is nonmetallic and
does not react to bacteria. The passages inside the wheel are impregnated with a desiccant material, such as
silica gel.
2.
When damp air is pulled through the supply air section of the wheel and contacts the desiccant it removes
moisture in a process known as “adsorption”. The removal of moisture causes the air to warm due to the
heat of vaporization of water in the air.
3.
As the wheel rotates the stored moisture is moved from the supply air path to the reactivation air path.
Heated air in the reactivation air path passes over this section of the wheel, releasing large amounts of
moisture. We say the desiccant is “reactivated”. This process is constant as the desiccant wheel is
continually rotating.
4.
See Sequence of Operation for a logic description of the DryCool™ HD desiccant dehumidifier.
To avoid the problems often caused by moisture and create a comfortable environment, a dehumidifier is
required or necessary to maintain relative humidity between 40-50% throughout the environment. Only
supplemental dehumidification provides indoor humidity control regardless of air conditioner operation or
outside moisture conditions.
