NRD317880 Issue A
Page 8
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Operation
4
Operation
4.1
Safety
Plug the power cable into the IEC 320 socket at back of the enclosure.
Switch on the power.
Fan 1 should start up on the power being switch on.
Check there is airflow from the fan by placing a hand over the mesh at the opposite end of the box from the
fan.
Do not block the inlet of the fan or the ventilation mesh. Allow at least 50 mm clearance around the Acoustic
Enclosure.
If the internal temperature reaches 35 ± 5 °C the second fan will switch in.
4.2
Over temperature alarm
There is a warning buzzer on the front face of the bulkhead. This is triggered by a thermal switch inside the Acoustic
Enclosure, which is set to 50 ± 5 °C. The buzzer will be triggered if the fan fails and the pump continues running,
interruption of the power supply or similar event. If the pump overheats it will thermally protect itself.
The buzzer will run for at least 12 hours on battery back up.
4.3
Buzzer test
There is a push button test switch for checking that the battery backed up buzzer works. This can be tested either
with the unit connected to the mains supply or on battery back up.
4.4
Pump monitoring
It is recommended that the user should use appropriate techniques to monitor the pump temperature and initiate
protective measures in fault intolerant applications.
WARNING
This enclosure must only be operated in an upright position. Isolate power before removing the
pump from the enclosure.