MANN+HUMMEL NLG Series User manual

19 611 28 017 Version 0806
NLG series
Operating Instructions

MANN+HUMMEL Industrial Filters 2
NLG
Contact Information
MANN+HUMMEL GMBH
Business Unit Industrial Filters
Brunckstr. 15,
D - 67346 Speyer
Germany
Telephone: + 49 6232 53 8265
Telefax: + 49 6232 53 8370
Contents
1. Preface ................................................................ 2
2. Safety................................................................... 3
2.1 Warnings and symbols.................................. 3
2.2 Intended use ................................................. 3
3. Functional description....................................... 3
4. Installation .......................................................... 4
5. Maintenance/repair............................................. 5
5.1 Maintenance schedule .................................. 5
5.2 Maintaining the main element ....................... 6
5.3 Replacing the secondary element................. 7
5.4 Maintaining the dust discharge valve ............ 8
6. Storage of lter elements .................................. 8
7. Disposal of components.................................... 8
8. Troubleshooting ................................................. 9
1. Preface
These operating instructions should make
it easier for personnel to familiarize them-
selves with the NLG series and to use it in
the various application areas for which it was
designed.
The operating instructions contain important
information on operating the components
safely, correctly and economically. These
instructions must be followed in order to avoid
danger, reduce repair costs and down times
and increase the reliability and working life of
your machine.
The instructions must be made accessible to
every person working with the lter.
Furthermore, these instructions must be
supplemented as necessary with the appli-
cable national regulations regarding accident
prevention and environmental protection (in
particular the disposal of removed parts).
We reserve the right to make technical modi-
cations to the lter and/or modify the content
of these operating instructions.

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2. Safety
2.1 Warning instructions and symbols
All instructions marked with this sym-
bol must be observed closely in order
to avoid damage to or the destruction
of lter components.
This symbol indicates that special
attention must be paid to these instruc-
tions in order to ensure trouble-free,
economical operation.
2.2 Intended use
The lter may only be maintained by quali-
ed, authorised personnel.
The lter is constructed to the state-of-the-
art and in accordance with recognised safety
specications. However, the functional safety
of downstream assemblies may be affected
if:
– the lter is used incorrectly or for a purpose
for which it was not intended,
– the operating conditions change,
- modications are made without consulting
the manufacturer
– necessary maintenance and repair work is
not performed.
Use the lter only if in perfect condition and
in accordance with the respective technical
specications, observing correct procedures
regarding safety and danger, and in compli-
ance with the operating instructions. In par-
ticular, malfunctions that may affect safety
must be eliminated immediately.
The filter is designed exclusively for the
mechanical ltration of air. Other applications,
e.g. ltering aggressive, combustible and/or
explosive materials is considered incorrect
use. In this case, the manufacturer/supplier
will reject all liability in event of resultant dam-
age.
Intended use also includes observing operat-
ing instructions and complying with inspection
and maintenance requirements.
It is imperative for the operator to check the
lter regularly for externally visible signs of
damage or faults (when servicing at the lat-
est).
All labelling and identication marks on the
lter must be legible at all times.
3. Functional description
The NLG series is a air cleaner designed for
cleaning intake air induced by all types of
machine (e.g. motors, compressors, fans).
One and two-stage versions (Piclon) are
available.
With a two-stage lter, the induced air is cir-
culated in the lter housing by guide vanes.
The centrifugal forces generated here force
heavy dust particles outwards against the
housing wall and discharge them via the dust
discharge valve in the lower section of the
housing (1st lter stage).This option is par-
ticularly suited to applications with high levels
of dust.
The induced air is cleaned and reaches the
air outlet spigot through the main element
(second ltering stage) and the downstream
secondary element (optional). The specied
dimensions mean that the lter elements seal
radially to the clean-air spigot on the hous-
ing.
With the one-stage lter (Pico), the induced
air will be cleaned directly by the main ele-
ment.

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The radial seal offers the following advan-
tages:
– minimal effort when assembling and disas-
sembling
– low compression load on paper bellows
– main element requires assembly via lower
section of housing
– length tolerances are balanced by overlap-
ping of sealing surfaces
=> higher level of reliability with regard to dust
entry prevention.
The optional secondary element available for
all sizes prevents dirt particles from enter-
ing the motor during maintenance or opera-
tion with a main element damaged through
improper handling. Secondary elements can
be retrotted at any time.
The lower housing section differs acc. to ver-
sion:
1. With dust discharge valve for two-stage l-
ters (Piclon).
2. With screening valve for one-stage lters
(Pico) as a water extractor.
Wire clamp latches connect the lower hous-
ing section with the middle housing section.
The housing cover is screwed to the
middle section. Do not untighten these
screws.
As an option, seals can be installed on
the non-ltered air side as hose-proof
protection. However, only limited water
passage is possible.
The intake neck can also be tted with a rain
cap as an option, for protection from rain or
snow.
4. Installation
The customer-supplied bracket on
the vehicle or the unit must be stable
enough to take forces which are and
to prevent relative motions of the xing
points to each other (for template, see
lter drawing).
– Fasten the lter using the four M10 screws
(torque: 22Nm).
For models with a dust discharge valve
and a horizontal installation position,
the dust discharge valve must point
downwards (± 15° deviation of “OBEN/
TOP” mark is permitted); if necessary,
remove lower housing section and ret
in the required position.

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5. Maintenance/repair
Only carry out cleaning, maintenance
and repair work when the assembly is
switched off (motor, compressor, fan,
or similar). Never operate when the l-
ter element has been removed.
5.1 Maintenance schedule
Component Task Maintenance time
Main element
Replace
(if the main element cannot be
replaced, it can be cleaned if nec-
essary, as described in Section
5.2.2)
As per the operating instructions for
the respective devices or motors,
after the maintenance indica-
tor/switch has triggered or after 2
years at the latest
Secondary element
(optional) Replace
After maintenance has been per-
formed on the main element 5
times or after 2 years at the latest
Dust discharge valve (if available) Check for damage/function and
clean
Depending on the dust concentra-
tion in the environment (e.g. daily if
large amounts of dust)
Plastic housing
Check for damage and cracks When performing maintenance on
the lter
Maintenance display/switch (on
clean air tube) Check function 1) Annually
1) In order to attain the maximum permitted vacuum in the air intake system, reduce the size of the intake opening
slowly while the motor is running by covering it (e.g. with a piece of card or a metal plate) until the maintenance
indicator/switch triggers.
After the maintenance indicator has triggered, do not continue to reduce the size of the intake opening as this will
cause damage.
After the test, reset the maintenance indicator by pressing the reset button.

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5.2 Maintaining the main element
Only carry out maintenance on the
main element when the maintenance
indicator/switch has triggered or after
2 years at the latest and in accordance
with the instructions from the device or
motor manufacturer.
5.2.1 Removing the main element
– Release wire clamp latches and remove
lower housing section (see Fig. 1).
Figure 1: Removing lower housing section
– Pull main element downwards, turning
slightly and remove completely from the
inner seat (see Fig. 2).
Figure 2: Removing the main element
Carefully wipe the inside of housing
with a damp cloth. Make sure that dust
or dirt does not reach the clean-air end
of the lter.
5.2.2 Cleaning the main element
Never wash, brush or knock the main
element. Only blow it out in cases of
emergency. However, no dust may
touch the inner side of the main ele-
ment.
In cases of emergency, the main ele-
ment can be cleaned as described
below. Because minimal damage is
often very difcult to detect or cannot
be detected at all, we always recom-
mend using new elements to protect
the motor or equipment. We cannot
warranty cleaned elements.
– To clean the main element, t a tube to a
compressed-air gun the end of which is
bent to approx. 90°. The tube must be long
enough to reach the bottom of the main ele-
ment. Carefully blow out the main element
with dry compressed air (maximum 5 bar)
by moving the tube up and down inside the
main element until dust no longer escapes
(see Fig. 3).
The tip of the tube may not come into
contact with the lter paper.
Figure 3: Cleaning the main element

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Before retting, 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 t 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 rst.
– 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 ange 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

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5.4 Maintaining the dust discharge
valve
Dust discharge valves should be checked
according to dust concentration in the sur-
roundings and preferably daily at heavy dust
occurence. Remove any dust deposits by
squeezing the valve (see Fig. 6). The valve
must be free and should not strike anything.
Replace damaged valves.
6. Storage of lter elements
Protect stored filter elements from
exposure to dust, moisture and dam-
age. Store vertically, preferably in their
original packaging.
It is practical to keep at least one replace-
ment element in stock for each lter element
required.
7. Disposal of components
Figure 6: Draining the valve
Component Material Disposal
Main element Filter paper
Polyurethane foam PP-T20
Dispose of as per local
regulations
Secondary element
Filter paper/eece (depending on model)
Polyurethane foam / glue
PA 6 - GF 30
Dispose of as per local
regulations
Housing cover PP-GF30 Plastics recycling
Middle section of the housing PP-GF30 + steel inserts Plastics recycling
Lower section of housing PP-GF30 Plastics recycling
Diffuser PP Plastics recycling
Wire clamp latches Spring steel wire Metal recycling
Screws Steel Metal recycling
Dust extraction valve NBR Rubber recycling
Screening valve TPE-S Plastics recycling

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8. Troubleshooting
Error/Fault Cause Elimination
Dust build-up in lower section of
housing
Dust discharge valve blocked or
defective
Carry out maintenance on valve (see
section 5.4), replace, if necessary
Dust on clean end downstream
of lter
Lines and/or connections leaking
on clean end downstream of lter
Remove dust carefully, seal lines and
connections
Dust on clean-air end in and
downstream of lter
Main element defective
Remove dust carefully, inspect main
element and if necessary, replace
together with secondary element (see
section 5)
Incorrect maintenance Remove dust carefully, perform main-
tenance as per section 5
Housing not closed correctly
Remove dust carefully, check main
element, housing and connections
for damage; replace if necessary and
close housing correctly (see section 5)
Wrong main and/or secondary ele-
ment used
Remove dust carefully, insert original
MANN+HUMMEL lter elements