www.poolpak.com | 800-959-7725
12
| ComPak
®
Series - Installation, Operation and Maintenance
PoolPak
®
models include a factory mounted and wired space temperature and humidity sensor at the return air
opening of the unit. Refer to the installation section for mounting location. Caution should be exercised. When
the outside air is to be introduced into the space for ventilation, adequate exhaust capacity via an integral (or a
separate external fan) must be specified to ensure the poolroom remains slightly negative. An inadequately sized
exhaust system may result in damage to the structure and pool odors may be forced into other areas of
the building.
Room Dew Point Control
PoolPak units with the CommandPak® Control System (CPCS) controller operate using an advanced type of
control called dew point temperature control. This method of control is more accurate than conventional relative
humidity control. The main purpose of a dehumidification system is to maintain the amount of moisture in the
pool area below a level that would cause damage to the building. Relative humidity is a measurement of the
percentage of moisture which is in the air at a given dry bulb temperature in proportion to the maximum amount
of moisture that could be contained at this particular dry bulb temperature. Warmer air can hold more moisture
than colder air and, therefore, changes in dry bulb temperature will change the relative humidity reading without
any change in the actual amount of moisture in the air. The amount of moisture in the air is expressed as “grains
of moisture per pound of dry air” and is directly related to the dew point temperature.
The CPCS-PCP uses dew point control to operate the PoolPak® unit and maintain the moisture level below the
setpoint. The space dry bulb temperature and relative humidity determine the dew point temperature. By varying
the space temperature and space relative humidity set points, the dew point set point is changed. When the
space dew point temperature rises more than 1/2 degree Fahrenheit above the space dew point temperature
set point, the CPCS-PCP controller energizes the compressor for dehumidification. As the dew point temperature
drops more than 1/2 degree Fahrenheit below the dew point temperature set point the controller de-energizes
the compressor.
ComPak Operation
The ComPak® fan draws in warm, moist air from the pool enclosure. This air passes through the evaporator
(dehumidification) coil and gives up heat energy to the refrigerant which is in a cool, liquid state. This exchange
of energy causes the air temperature to fall below its dew point, resulting in moisture condensation on the
evaporator coil. The moisture formed falls into the unit’s condensate drain pan. After passing through the
evaporator coil, the refrigerant becomes a cool gas.
The refrigerant enters the unit’s compressor, where it is compressed into a hot gas. While in the compressor, the
refrigerant absorbs the energy used to operate the compressor. This hot gas refrigerant then travels either through
an air reheat coil, the pool water condenser or to an optional auxiliary air conditioning condenser, which may
be either air or water cooled. If air heating is called for, the air reheat coil is used. The hot refrigerant exchanges
energy with the cooler, dehumidified air coming from the evaporator coil. This causes the temperature of the air
to rise for heating.
