To Replace The Battery; To Clean The Airflow Sensor Orifice - Carrier VAV Zone II Installation And Startup Manual

Short the Format Short pins jumper's pins and maintain the short for steps 3 and 4.
2
Insert the power screw terminal connector into the VAV Zone II's power terminals.
3
Continue to short the jumper until the Error LED flashes three times in sync with the Run LED.
4
Remove the short.
5

To replace the battery

If the VAV Zone II experiences a power outage and the control program stops functioning, replace the battery.
You need to replace the battery if the voltage measures below 2.9 volts when the controller is not powered.
Verify that the VAV Zone II's power is on.
1
CAUTION If the controller's power is not on when replacing the battery, your date, time, and trend data
will be lost.
Remove the VAV Zone II's cover.
2
Remove the battery from the controller, making note of the battery's polarity.
3
Insert the new battery, matching the battery's polarity with the polarity indicated on the controller's cover.
4
Replace the VAV Zone II's cover.
5
Download the VAV Zone II.
6

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.
VAV Zone II Controllers
Installation and Start-up Guide
67
Troubleshooting
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