Troubleshooting
Zone Ctrl II and
VAV Zone II Secondary Duct Installation and Start-up Guide CARRIER CORPORATION ©2019
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To clean the airflow sensor orifice
In less than .02% of installations, small particulates (micron/submicron-level) can build up in the airflow sensor's
internal orifice causing airflow restriction. Symptoms of airflow restriction are:
• Diffuser noise increases over time
• Space overcools at minimum airflow
• Frequency of dampers opening to maintain flow setpoint increases over time
• AHU fan speed increases over time
To check for these symptoms, set up trending of:
• Damper position to look for long term increase
• AHU fan speed for maintaining static pressure
If you see these symptoms, you should clean the flow sensor.
To clean the flow sensor
You can use a can of compressed air to clean the sensors while the controller is installed or on a repair bench.
1 Disconnect the
and
flow sensor tubes.
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