www.poolpak.com | 800-959-772578 | MPK Series - Installation, Operation and Maintenance
OutDprFB = Outside Air Damper Feedback (C)
RcrDprFB = Recirculation Air Damper Feedback (C)
SpcPress = Space Pressure Sensor (B)
RtnCO2 = Return CO2 sensor (B)
SurfTemp = Cold Surface/Wall Temperature (A)
OAFltrPD = Outside Air Filter Pressure Differential (B)
RAFltrPD = Return Air Filter Pressure Differential (B)
A - Value from the sensor is outside of the expected range.
• If the value is a large negative number (-192F), this indicates an open circuit to the sensor. Check the sensor
and wiring connections.
• If the value is a large positive number (256F), this indicates a short circuit to the sensor. Check the sensor and
wiring connections.
B - Value from the sensor is outside of the expected range.
• If the value is negative, this indicates an open circuit to the sensor or a lack of 24VDC power. Check the
sensor and wiring connections and the status of the DC power supply. The DC current in the sensor loop
should be between 4 and 20 mA.
• If the value is greater than the max value in the analog input configuration screen, this indicates a failed
sensor or a short circuit in the wiring. In this condition, it is also possible for the analog input to be damaged.
This can happen if the sensor fails shorted or is connected improperly.
C - Feedback value from the actuator is outside of the expected range.
• Check to be sure actuator is receiving 24VDC power and is moving as requested by the position signal.
Fault History Log
To assist in troubleshooting, the CPCS controller maintains a rolling log of the last 100 faults. In addition, each
compressor module also maintains a rolling log of the last 100 faults occurring at that compressor module.
The fault history log is the “History” option as selected in the “Service” menu. See the History section of Controller
Navigation for more details on these screens.
Manual Mode
The CPCS controller contains an enhanced manual control mode for improved troubleshooting efficiency. Manual
Mode is located in the Service menu of the controller. Navigating the manual mode menus is the best method to
troubleshoot complex issues with system performance, digital outputs, and analog outputs.
Refer to the Manual Mode section of Controller Navigation for more information.
Digital and Analog Input Configuration
In the Input/Output Configuration (I/O Config) under the Service menu of the controller, the status and configuration
of digital and analog inputs can be viewed. This information can be helpful to determine if an input is correctly
configured to be received by the CPCS controller.
DIGITAL INPUT
Each digital input of the CPCS controller can be viewed in the Service menu of the controller. These screens give you
a read-only indication of the status of these inputs. These inputs can be useful in confirming whether or not the CPCS
controller is receiving an input from a certain component (ie. fire alarm system, smoke detectors, occupied override,
manual purge mode, remote exhaust fan status, freezestat, or remote AC proof).
ANALOG INPUT
In addition to the digital and analog outputs, each analog input of the CPCS controller can be configured or
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