CXM Control PCB

The CXM microprocessor control PCB is the standard controller on ClimateMaster systems and is available in three models CXM, CXM-LON and CXM-MPC with no BMS communication, Lonworks and Multi Protocol (BACnet, JCI N2 or Modbus).

The CXM PCB is shown above. Short the TEST terminals and the unit enters a 20 minute test mode with the time delays speeded up by 15 times and a display of the last memorised fault code.

Information codes are shown above

Fault Codes are shown above

These are what the various terminal codes mean

This is how the CXM connects to the wall thermostat compared with DXM.