PoolPak PCP Series
–
Outdoor OMM
22
September 2020
Sequence of Operation
–
4 to 7 tons
The d
ehumidifier’s
ventilation system establishes the required airflow through the dehumidifier. The control
system compares air temperature and humidity to their desired values (set points) and proceeds to dehumidify,
cool or heat the recirculating air.
If the dehumidifier is equipped with the pool water heating option, the pool water temperature is compared to its
set point and pool heating is provided if required.
Set Points
The control system is constantly adjusting unit operation to achieve and maintain said parameters within couple
degrees/percent of the set point.
Refer to the
dehumidifier’s
main label for the design value of control parameters, as well as the following note.
Ventilation.
The
main blower
runs continuously. The
minimum exhaust fan
(EF1), if the dehumidifier is equipped with it,
directs portion of return air outdoors to allow for fresh outdoor air to be introduced to the premise through the
damper for minimum
outdoor air
intake (OA1).
The
main blower
and
exhaust fan
speeds are controlled via adjustable (pre-set) variable signals: while the main
blower speed is maintained constant, the exhaust fan speed varies depending on scheduled ventilation mode
(Occupied, Non-Occupied and Spectator) or call for Economiser Mode (as part of Air Conditioning and/or
Dehumidification operation).
•
Note
.
Externally installed Exhaust Fan(s) and Outdoor Air damper(s) could be also controlled by the
dehumidifier control system. This applies to both, Minimum and Purge/Additional, fans and dampers
Space Heating
When premise air temperature drops below the set point, the dehumidifier control system issues a call for Space
Heating Mode and engages space heater (electric or gas heater, hot water coil with valve etc.) by sending space
heating signal, respective to space heater control type - on/off, variable (0-10VDC), etc.
Air Conditioning, Dehumidification and Pool Heating.
Compressor(s)
Whenever the compressor operates, the evaporator is always dehumidifying and cooling the return air. The heat
removed from the air at the evaporator, as well as the heat from the compressor's action, must be rejected to one
of three heat sinks: room (premise) air, pool water (if applicable) or outdoors. The control system will direct the
heat to where it is needed based on room (air and pool water temperature) conditions:
•
If room air is needed to be warmed up
–
more heat is diverted towards reheat coil;
•
If pool water is needed to be warmed up
–
more heat is diverted towards pool heating coaxial heat exchanger
(if dehumidifier is equipped with this option).
•
Rest of the heat (if any) is diverted towards outdoors (outdoor condenser, fluid cooler, etc.)
Compressor Circuit Operation
Note:
To ensure the dehumidifier’s most economical operation, we recommend maintaining the following
relationship between pool water and room air temperatures:
Room Air T = Pool Water T + 2˚
F
