AFA4000/E VAV Airflow Controller / p.116
If the sash light beams intermittently sense the glass object, ensure sw1 is set to Off (short
range) and repeat steps 5 to 14 above.
If the beam is broken when the path is clear and adjusting the Gain Potentiometer does not
resolve this situation, either:
Switch sw2 On (Diagnostic mode). After approximately 15 seconds the RX ERR and TX ERR
LEDs (Figure 63) will indicate if there is a faulty beam:
• RXERR Red LED On – Faulty receiver
• TXERR Red LED On – Faulty transmitter
Or:
Clean or replace the faulty component and set sw2 to Off (Operation mode).
7.6.8 Tilt switch
No user calibration of the Tilt Switch is possible. When using a Tilt Switch, ensure that the top
panel of the fume hood is closed before switching on the Auto Sash Control Unit.
7.6.9 Sash position sensor
No user calibration of the Sash Position Sensor is possible. The sensor provides sash position
data to the Auto Sash Controller, relative to its starting position.
7.6.10 Personnel sensor
The sensor is self-calibrating and does not need adjusting.
For optimum performance, ensure the detection field in front of the fume hood is clear from
objects and personnel when powering up the Auto Sash Control Unit.
The sensor will be fully operational approximately 10 seconds after the sensor is powered up.
The LED on the sensor will be green if the detection area is clear and red if it is not clear.
To test that the sensor is operational, listen to whether the internal relay clicks when standing in
front of the fume hood and when walking away.
7.6.11 Sash low switch
No user calibration of the Sash Low Switch is possible.
7.6.12 Auto Stop
The Auto stop feature uses the calibrated middle position as the stop position
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