PoolPak R-410A SWHP Series - ECC Control System Overview; Humidity Control Functionality

12 EGW05-SWHPEG-20140724
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ECC CONTROL SYSTEM
OVERVIEW
The PoolPak™ is controlled by the Electronic Control Center (ECC III), a microprocessor-based system that
incorporates all of the functions necessary to maintain correct natatorium space temperature and humidity and control
pool water temperature. The ECC is designed to work with the PoolPak™ dehumidication system to provide an
environment that is both comfortable and cost effective. It controls unwanted humidity in the pool enclosure and helps to
prevent unsightly condensation from forming on surfaces.
System parameters and/or system status readouts are provided on the remote-mounted display/keypad panel, Remote
Interface Unit (RIU). Set points may be changed easily and may be password protected. Set points are saved in the
memory of the ECC and are not erased in the event of a power failure. Critical operating data can be easily accessed by a
qualied service technician for the purpose of system operation and evaluation.
The ECC III controller has a fault code history log that records the last 50 faults in the order of their occurrence. Each
fault code is recorded along with the date and time and the values of the critical system parameters. This fault code
history log is accessible at the control panel via the ECC III controller and at the remote display/keypad panel (Remote
Interface Unit, RIU). The fault code history log is also accessible with the optional Remote Access Package (RAP). This
Remote Access Package is available only with a BACnet/IP based Building Automation System (BAS).
The PoolPak™ ECC III also has the option to be directly connected to several different BAS options. The ECC III can be
connected to either a LonWorks based BAS or a Modbus RTU based BAS, BACnet/IP and BACnet MS/TP.
All PoolPak™ operating and logic controls are factory mounted and wired. The control sequences are designed
specically to control swimming pool environmental conditions.
As a minimum, the PoolPak™ control system provides full modulation of the heat recovery/heating system by
proportional control of dry bulb temperature, relative humidity, interior building-skin-temperature-based humidity reset,
and outside air volume.
The PoolPak™ controls automatically operate the heating, dehumidication, and heat recovery system in response
to the greatest requirements while adjusting unit outputs to maintain building conditions. The PoolPak™ controls are
capable of providing full heating capacity to either air or water and of providing proportional control of heating and
dehumidication by loading stages of compressor capacity as necessary. As building requirements are satised, the
compressor unloads.
The PoolPak™ System provides outside air ventilation to satisfy minimum air ventilation requirements per ASHRAE
62.1 ventilation standard.
HUMIDITY CONTROL
When equipped, the economizer is activated if dehumidication is required, air temperature is satised, the absolute
humidity of the outside air is lower than the absolute humidity of the pool room air and the outside air temperature will
not adversely affect the pool room air temperature.
The PoolPak™ provides full proportional control of relative humidity by staging unit capacity. The humidity controller
energizes the compressor. The moist air from the pool room is drawn over the evaporator coil, where the air is cooled
below its dew point. In this cooling process, the moisture in the return air is condensed onto the evaporator coil. The heat
recovered in the refrigerant from the dehumidication process is directed to the air reheat condenser if the space needs
heating or to the pool water condenser if pool water temperature is below the set point.