Maintenance
102
89217391 Rev. A
©2022 nVent
11.4.2 Secondary circuit
Replace the filter in the secondary circuit in accordance with the maintenance plan.
NOTE
•
The secondary circuit consists of two circuits. During maintenance, one
circuit can be maintained during operation (e.g. filter change).
•
The circuit that is to be maintained must first be deselected via the control
unit.
•
In the "Automatic switching" mode, ensure that the system does not switch
during a running maintenance task. Otherwise, there is a risk of a
malfunction or system downtime.
•
We recommend practising the filter change procedure several times while
the servers are not in operation.
1.
Check the display of the control unit to identify the filter for which
maintenance is due (i.e. the filter with the highest differential pressure).
2.
At the control unit, switch the unit to single-pump operation without
switching.
3.
Deactivate the corresponding pump (1 or 2) via the display and ensure that
the other pump is active.
Fig. 40: Filter change (secondary circuit)
Perform the filter change as follows:
4.
Open the back door (7) of the cabinet.
5.
Close the butterfly valve (5 or 6).
NOTE
The pipes are under pressure.
