18 | Commissioning
Installer and user reference guide
114
SV1A25AJV1B+SV4~8A14AJV1B
VRV 5 safety valve unit
4P749917-1 – 2023.09
18.3.5 Troubleshooting during a SV unit test run
Symptom: The damper does not open
Possible causes Corrective action
Incorrect field settings Check if all field settings are made
correctly. When in parallel or series
configuration, the field settings of all SV
units in a cluster need to be made
correctly.
Damper wiring is loose Reattach any loose damper wiring.
Damper blocked Remove blocking objects.
Symptom: The extraction fan does not turn ON
Possible causes Corrective action
Incorrect field settings Check if all field settings are made
correctly. When in parallel or series
configuration, the field settings of all SV
units in a cluster need to be made
correctly.
Fan extraction circuit broken ▪ Check that the circuit exists.
▪ Check that the circuit is connected
correctly.
▪ Check that the circuit is powered.
Symptom: The airflow rate is too low
Possible causes Corrective action
Incorrect field settings Check if all field settings are made
correctly. When in parallel or series
configuration, the field settings of all SV
units in a cluster need to be made
correctly.
▪ When in parallel configuration: check
that no dampers of other SV units in
the same cluster have opened.
▪ When in series configuration: check
that all dampers of other SV units in
the same cluster have opened.
Flow blocked Remove blocking objects.
Incorrect fan size Check if the sizing of the fan is
appropriate. Adapt if necessary.
Incorrect fan speed Check if the fan has different speed
settings. Select a higher speed if
necessary.
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