MANN+HUMMEL Industrial Filters
7
NLG
Before refitting, check the paper bel
-
lows and the seals on the cleaned main
element carefully for damage.
Inspect each fold in the paper
bellows for tears and holes using a
suitable torch (see Fig. 4). In order to
be able to detect minor damage, the
inspection should not be carried out in
direct sunlight but e.g. in a darkened
room.
Figure 4: Inspecting the main element
Main elements must be replaced after
2 years at the latest, irrespective of the
operation duration. Damaged main ele-
ments should not be used under any
circumstances. If in doubt, always fit a
new main elements.
5.2.3 Fitting the main element
Only use original MANN+HUMMEL
elements. Never fit elements with a
metal outer casing.
– Carefully insert the main element into the
housing open end first.
– Position lower housing section (observe
position of the dust discharge valve, see
also Section 4).
– Position the wire clamp latches in the
groove on the flange on the middle housing
section and tighten (same as Fig. 1 but in
reverse).
5.3 Servicing the secondary element
The secondary element must be
replaced every 5th maintenance ses-
sion carried out on the main element,
or after 2 years at the latest.
5.3.1 Removing the main element
See Section 5.2.1
5.3.2 Replacing the secondary element
The secondary element must not be
cleaned and after removal should no
longer be used.
– Unscrew the secondary element in a coun-
terclockwise direction and remove it.
– Insert the secondary element and turn it in
a clockwise direction until it is hand-tight (5
Nm) (see Fig. 5).
Figure 5: Installing the secondary element.
5.3.3 Fitting the main element
See Section 5.2.3