© 2017 PoolPak LLC. All rights reserved. MPK Series - Installation, Operation and Maintenance | 39
PoolPak
®
MPK Series IOM
The contacts may be directly connected to the heater control circuit, provided it is 115 VAC maximum and the
current does not exceed 1A inductive. Any other application will require the use of an additional field-provided
and installed relay to interface to the heater. The auxiliary heating system must provide its own thermostat, wired
in series with the output of the CPCS. Typically, the set point for this thermostat is 2°F above the pool water
temperature set point in the CPCS.
Alarm Output (22)
The CPCS will activate the alarm output when uncleared alarms are present. This output mimics the status of the
red alarm light on the RIU. The output provides form C dry contacts. The contacts may be directly connected to an
external circuit, provided it is 115 VAC maximum and the current does not exceed 1A inductive.
Auxiliary Air Cooling System (23)
The CPCS provides contact closure outputs for up to 3 stages of auxiliary cooling. These outputs operate in unison
with the analog output signal as described as item 16 – Auxiliary Chilled Water Control Valve.
Auxiliary Air Heating System (24)
The auxiliary heating system is normally factory-installed inside the PoolPak unit. In this case, all interface wiring
between the CPCS and the heater is factory-installed. If the PoolPak® is not equipped with an auxiliary heating
option, the CPCS provides contact closures to control three discrete stages of auxiliary air heating. The contacts
may be directly connected to the heater’s control circuit provided it is 115 VAC maximum and the current does not
exceed 1A inductive.
The three outputs are energized in order, by number, as heating demands dictate. These outputs operate in unison
with the analog output signal as described
Outside Air Temperature and Relative Humidity Sensor (25)
The CPCS uses an outside air temperature and humidity sensor to make smart economizer decisions and to prevent
aircooled condenser operation during low ambient conditions.
The sensor should be mounted on the exterior surface of a north-facing wall without exposure to direct sunlight.
Wire entry to the sensor terminal box is provided with a compression-type fitting, suitable for cable diameters of
from 1/8 to 1/4 inch.
Do not connect a conduit directly to the sensor’s terminal box. Use a small piece of UV-resistant cable to make the
transition from the conduit to the sensor. A direct conduit connection will allow condensation to form inside the
sensor, resulting in permanent damage.
Orient the sensor as shown on the included instruction sheet. Proper orientation of the sensor and radiation
shields is essential. Carefully review the wiring connections shown on the field-wiring diagram. Improper connection
may damage the sensor and/or the CPCS control module. The cable should be four-conductor (two twisted pairs),
16–20 AWG copper.
Improper connection may damage the sensor and/or the CPCS control module.
The cable should be four-conductor (two twisted pairs), 16-20 AWG copper.
! CAUTION
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