2.2 Filter change
Caution
Risk of injury from incorrect work. Filters must be
changed by trained personnel !
In TopVent
®
gas units that are equipped with a filter, a pres
-
sure difference monitor has been installed for the monitoring
of the filter. Change the filter if the 'Filter' alarm appears on
the control unit:
1
2
■
1
Isolation switch
■
2
Sliding doors
Fig. I1:
Position of the filters
Changing the filters – TopVent
®
DGV, NGV, MG
■
Switch the isolation switch (Item
1
) to the 'Off' position
and wait until the fan comes to a stop.
■
Open both sliding doors in the filter box (Item
2
) one after
the other, change the filters, and reclose the sliding doors.
■
Switch the isolation switch to the 'On' position again.
2.3 Inspection and maintenance work
Caution
Risk of injury from incorrect work. Annual inspection
to be carried out only by Hoval customer service!
The following work is carried out during the annual
inspection:
■
Emission measurement
■
Flue gas path test
■
Visual inspection of the heat exchanger
■
Function test
■
Check of the settings
2.4 Repair
Caution
Risk of injury from incorrect work. Repair work to be
carried out only by Hoval customer service!
Please contact Hoval customer service if needed.
I
77
Operation
Maintenance and repair
Operation
