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The table above helps the user to troubleshoot possible aeraulic problems when the ECRO-RV is put into service.
Problem :
Low air suction
Cause :
The fan is ill-suited
The fan rotates in the wrong direction
There are problems in the aeraulic network.
Solution :
Select a suited fan
Reverse the direction of rotation
Remove the potential obstacles (eg: mechanical damper/air bump)
Problem :
The actual velocity is different from the velocity setpoint.
Cause :
The probe is in a zone of excessively turbulent airflow.
The hot-wire probe is misplaced.
Bad environmental conditions for the probe.
Solution :
Remove the turbulence affecting the probe.
Do place the probe as indicated by the manufacturer.
Make sure that the probe takes a measurement between the laboratory and the fumehood; otherwise,
cover the probe to protect it.
BEWARE not closed false ceilings
BEWARE the airtightness between the probe and the laboratory.
Problem :
Oscillation phenomenon in the device during the regulation “Pumping”
Cause :
The inverter’s deceleration/acceleration ramps are too slow.
The inverter’s frequency min. is too low.
The regulator’s response time is too short.
Solution :
Reduce the inverter’s ramps.
Increase the inverter’s frequency min.
Increase the regulator’s response time.
Problem :
The motorised damper works in the wrong direction.
Cause :
The damper’s direction of rotation is reversed.
Solution :
Reverse the direction of rotation.
