www.poolpak.com | 800-959-772536 | MPK Series - Installation, Operation and Maintenance
Cold Surface Temperature Sensor (4)
This sensor measures the temperature of the coldest surface in the pool enclosure. When the temperature of the
surface drops within 5°F of the space dew point, the dew point set point will automatically be reset downward to
help prevent condensation on the cold surface. It should be noted that this function will not be able to compensate
for lower-quality building materials, such as single-pane glass or non-thermally broken window frames.
The cold wall temperature sensor is shipped pre-wired and mounted on to the terminals. The sensor should be
mounted on an exterior window or skylight frame not subject to direct sunlight. In cases where there are no exterior
doors or windows, the sensor should be mounted on the interior surface of an exterior wall. Avoid mounting the
surface temperature sensor where it will get direct exposure from sunlight. The sensor housing has a single 1/8-inch
hole for mounting.
Wire as shown on the field-wiring diagram. Electrical connection should be made with two-conductor (one shielded,
twisted pair), 16-20 AWG copper cable. Connect the shield drain wire to ground at the PoolPak control panel
end only.
Supply Air Temperature Sensor (5)
This sensor measures the air temperature leaving the PoolPak unit to provide indication of possible freeze damage to
water coils in the unit. This sensor is factory mounted on the supply fan stand or, for units equipped with an auxiliary
air heating module, at the end of the unit.
Remote Space Pressure Sensor (Optional) (6)
If this option is selected, PoolPak will supply a space pressure sensor. This sensor measures the pressure difference
between the pool space and a reference space. The controls will provide an alarm if the pressure difference does
not meet a predetermined value that ensures sufficient negative pressure to prevent migration of pool odor.
For field wiring, wire as shown on the field-wiring diagram. Electrical connection should be made with two-
conductor (one shielded, twisted pair), 16-20 AWG copper cable. Connect the shield drain wire to ground at the
PoolPak control panel end only.
This sensor mounts through a wall between the pool space and a reference space (ie. hallway or lobby). Refer to
mounting instructions supplied with the sensor for specific instruction.
ACC OR WCC Proof Interlock (7)
The CPCS monitors terminals T13.17 and T13.18 for a contact closure from remote air-cooled or water cooled
condensers. This signal indicates the following:
• The remote condenser has power.
• The remote condenser has adequate water flow.
• The remote condenser is within the correct temperature range of the remote cooling application.
The CPCS will not select the mechanical air conditioning mode if the proof signal is inactive. For any questions on
field wiring the ACC or WCC proof for your remote cooling application, contact PoolPak Service.
Freezestat (8) (Special Applications Only)
The freezestat is only present in units with certain configuration and coil types. It provides a contact closure
indication to the CPCS when any point on the capillary tube sensor is below the set point (typically 40F). This will
activate the freeze protection mode. In this mode, the unit will go to full recirculation and open all heating and
cooling valves for full flow through the coil. The controller will generate an alarm condition to signal the user that
a problem has occurred. Freeze protection mode will terminate when the supply air temperature rises above 50°F.
If the freezestat is present, it will be factory wired and located on the upstream face of the chilled water coil.
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