© 2017 PoolPak LLC. All rights reserved. MPK Series - Installation, Operation and Maintenance | 11
PoolPak
®
MPK Series IOM
SECTION II: PRINCIPLES, FUNCTIONS AND FEATURES
The Mechanical Dehumidification System
Principles of Operation
The PoolPak System is a complete environmental control system designed expressly for indoor swimming pool
enclosures. It takes into account two important factors: the swimming pool occupant (personal comfort) and the
swimming pool environment (the physical structure and surrounding furnishings).
The swimming pool enclosure can be a hostile environment for equipment, decor and building structures. A PoolPak
System’s major function is to dehumidify the pool enclosure air through a vapor compression cycle. During this cycle
the PoolPak System recycles the sensible and latent heat and places it back into the pool water and air as needed.
This recycling process saves money and keeps your pool environment efficient and safe.
Solid state microprocessor technology, working in conjunction with sensors, continually monitors water and air
conditions to provide superior occupant comfort. Unlike typical outside air ventilation systems, a PoolPak System
recycles energy and blankets the walls and windows with warm, dry air.
PoolPak dehumidification systems reduce the energy input required to maintain pool water and air temperatures.
By dehumidifying the air and recycling the latent energy back into the pool air and water, the unit will reduce
operating costs when compared to conventional heating and ventilating systems.
A PoolPak unit, when matched correctly to the evaporation rate of the pool water and overall dehumidification
requirements, will efficiently maintain the pool air at relative humidity levels between 50% and 60%. It should be
noted that a lower evaporation rate occurs when the pool enclosure’s air temperature is maintained above the
pool water temperature. Evaporation losses, and the energy required to maintain desired room conditions, will
dramatically increase if the air temperature is allowed to fall below the pool water temperature. It is recommended
that the continuous dry bulb temperature entering the evaporator of the PoolPak unit not fall below 75°F.
PoolPak LLC recommends that backup heating equipment for both pool water and pool enclosure air is capable
of carrying the full system heating requirements. This makes for a well-designed system that will provide the least
amount of pool down time if unforeseen system problems occur. Building conductive loads and other losses must be
taken into consideration when sizing the dehumidification system or the auxiliary heating/cooling equipment.
Automatic Control of Air Temperature and Humidity
An integral part of any PoolPak system is a proven microprocessor control system which automatically senses
and maintains comfort conditions. Sensors detect changes in humidity and air temperature in the indoor pool
environment and quickly regulate supply air conditions to meet set point comfort levels, even during periods of
unusually heavy pool use.
To prevent condensation on walls and windows, the PoolPak system automatically adjusts humidity in response
to changes in wall or window surface temperatures. As the seasons and weather conditions change, the PoolPak
System changes its own mode of operation. Throughout the year, the PoolPak® thinks “efficiency” and automatically
selects the least expensive energy source for the poolroom conditions.
PoolPak units include a factory mounted and wired space temperature and humidity sensor at the return air opening
of the unit.
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