AFAM+ Option Alarm Codes

  • Code 122 - O2 Sensor Calibration Error (PTI Only) (if equipped)

  • Code 124 - Power Module Sensor Error

Parent topic: Advanced Fresh Air Management Plus (AFAM+) System

System Operation Verification

If the system appears not to be operating properly, it is best to verify that the controller can recognize if the AFAM+ option is installed. Use the Auto Configuration function found in the Config menu. Select setting to ON. Allow the configuration steps to complete. The last step of the configuration will be AFAM. Watch the Display closely during this test. When to AFAM door opens and closes, the AFAM option will be set. The controller will now test communications to the gas analyzer. When the gas analyzer is found, the option will change to AFAM+.

    Note

  1. Upgrade the controller software to the latest released version. Auto Configuration will be automatically initiated upon successful completion of a software flashload.

  2. If only the AFAM option is found, then there is a communication problem with the gas analyzer.

  3. If only Gas Analyzer is found, there is a problem with the operation of the damper motor.

To select Auto Configuration:

  1. Enter Config menu, select Unit, then Auto Configuration.

  2. Turn Auto Configuration ON by using F2 key.

  3. Press and hold F4 key to Accept.

Once the Auto Configuration is complete, and the AFAM+ system has been found and configured into controller memory, enter the desired settings. If the damper motor or the gas analyzer is not found during the Auto Configuration, use the diagram below (and the unit Schematic and Wiring Diagrams) to verify the connections, supply voltages, and communication wiring to the two components. Also verify that the AFAM+ Expansion Module is firmly attached to the back of the controller.

Alarm Codes and Actions

There is one (1) PTI alarm that could be generated on a unit equipped / utilizing an O2 sensor.

    Notice
  • Equipment Damage
  • If the inlet/outlet tubes or filter need to be cleared, disconnect from the gas analyzer BEFORE purging air through the tubes. If tubes remain connected, serious damage to the gas analyzer could occur.
Alarm Possible Cause Corrective Action(s)
Code 122 - O2 Sensor Calibration Error (if equipped) (PTI Only)

  1. Stale atmosphere / Filter or inlet / outlet tubes restricted (See Notice Above).

  2. O2 sensor reading < 17% or > 25%.

  1. Open evaporator access door or fully open vent door and allow unit to operate on high speed fan for 20 to 30 minutes to purge any old, stale air trapped in the analyzer module before performing PTI.

  2. If O2 reading is still out of calibration range after purge procedure noted above is performed, replace analyzer.
Values Menu Possible Cause Corrective Action(s)
CO2% Open or Short If no alarm has been generated, the system most likely has not communicated with or is verifying communications with the analyzer. Follow corrective action for Stale Atmosphere procedure above. If fault exists, an alarm will be generated.
O2% Open or Short If no alarm has been generated, the system most likely has not communicated with or is verifying communications with the analyzer. Follow corrective action for Stale Atmosphere procedure above. If fault exists, an alarm will be generated.