Carrier 33ZCVAVTRM Specifications download pdf (Page 23)

In either case, the bypass controller will check to ensure the

fan is off by reading its pressure sensor and damper position. If

the pressure reading is less than 10% of the static pressure set

point and the bypass damper position is less than 25% of the

resistance of the feedback potentiometer for greater than

60 seconds, then the bypass controller assumes the fan is off.

When the fan is off, the bypass controller will drive its damper

to the fully open position. If an invalid feedback resistance

value is detected, the bypass controller will terminate the

calibration. Once at the fully open damper position, the bypass

controller will read the output voltage of the pressure sensor. If

the voltage reads within the range of 1.0 vdc ± 0.1 volt, it

calculates the offset voltage based on the difference between

the output voltage reading and the nominal zero pressure

reading of 1.0 vdc. This value is then stored in non-volatile

memory. If the voltage reading is outside of the tolerance

range, the bypass controller will display “Alarm” in the

commissioning screen. The screen will display “Alarm” until a

successful calibration of the pressure sensor is performed.

When the calibration is completed, the bypass controller will

signal the Linkage Coordinator to return the fan to normal

operation.

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Carrier 33ZCVAVTRM Specifications Page 23