Fan And Motor Assembly; Protection Mesh; Combustion Chamber Inspection; Oil Pump - Munters GFn Mode D'emploi Et D'entretien

In order to ensure proper operation, the following
areas of the air heater should be cleaned:
• air inlet and outlet: remove dust and dirt. Make
sure the air inlet/outlet is not obstructed by dust,
dirt and debris;
• air heater's housing and exterior: wipe clean with
cloth or soft brush;
• burner: remove dust and dirt. Make sure the air
inlet is not obstructed by dust, dirt and debris;
• fan and motor assembly: remove dust and dirt by
using cloth, soft brush or compressed air.
• piping system, connectors and couplings: wipe
clean with cloth or soft brush.
WARNING Do not use pressurized water or
liquids to clean the air heater. Do not spray water or
liquids on electrical parts or inside heater. Water
may be used to clean only the external housing.
After this operation the case must be dried.
Improper cleaning of the heater can cause personal
injury or property damage.

7.3 Fan and motor assembly

Check the internal cartridge by unscrewing filter
recipient. Wash the cartridge using diesel oil,
kerosene or gasoline only. Clean and dry thoroughly
using compressed air only. Replace O-rings if
damaged or worn. Reassemble everything properly.

7.4 Protection mesh

Stop the heater (see Chapter 6.2), disconnect from
mains and allow heater to cool down until
temperature becomes normal.
Check the combustion air shutter position, adjust if
needed as indicated in fig. 9. Failure to set the
burners air shutter position properly will result in
smoke being emitted from the exhaust chimney
during functioning.
Check the ignition electrodes and terminals by
removing the burner head from its position. Clean
the ignition tips using clean cloth. Verify proper
position as indicated in fig. 10. Replace if needed.
Check the nozzle, clean it with compressed air or a
soft, dry rag. Do not use drills or such to clean the
nozzle hole. Replace if it cannot be properly
cleaned.
Check the photoelectric cell by disconnecting it from
the holder. Using a clean dry cloth, wipe lens of
photocell. Replace if needed.
WARNING After performing cleaning, service,
maintenance and adjustment operations related to
the burner, make sure the air heater is running
properly. Do not use an air heater in need of repair.

7.5 Combustion chamber inspection

Stop the heater (see Chapter 6.2), disconnect from
mains and allow heater to cool down until
temperature becomes normal. Disassemble top rear
housing, remove the grounding, disassemble the
burner and inspect the combustion chamber through
the burner orifice. Properly check the chamber walls
and weldings. Clean from soot and carbon residue if
needed, by using vacuum cleaner. Reassemble
everything properly.

7.6 Oil pump

For filter inspection or replacement unscrew the
filter plug (V) with a 4 mm key and pull out the
cartridge filter (H). If necessary, insert a screwdriver
between filter and plug and carefully twist the filter
out. Clean the filter using clean fuel. Scrap the filter
if necessary and press a new one onto the plug.
Properly reassemble the cartridge filter and tighten it
slightly. Verify against fuel leakage.
To adjust the pressure use a 4 mm key at
adjustment screw and turn the key clockwise or
counter-clockwise to properly adjust the pressure
(see fig. 11).
NOTE Do not modify the standard oil pump
pressure setting, unless needed. In case, use
always a manometer conn. G1/8 (see fig. 11).

7.7 Fan/motor assembly

Periodic inspection, checking and maintenance of
the fan/motor assembly are essential tasks for the
proper and safe functioning of the air heater.
For air heater models equipped with axial fan, follow
the procedure below:
• stop the air heater (see Chapter 6.2) and
disconnected from electrical line and fuel line;
• wait until the air heater is sufficiently cool if
previously functioning;
• wait until fan/motor assembly is completely still;
• manually rotate the fan/motor assembly and listen
for abnormal noise (bearing); if abnormal noise is
present then, replace the electric motor;
• check the damage to the propeller or shape
alteration; if any damage or shape alteration
occurs to the propeller it is necessary to replace
it;
• reassemble the protection mesh.
NOTE Due to balancing issues, it is recommended
to replace the whole assembly propeller blade
attached directly on the hub.
WARNING
maintenance and adjustment operations related to
the fan/motor assembly, make sure the air heater is
running properly. Do not use an air heater in need of
repair.
7.8 Protection mesh
The fixed protection mesh placed in front of the
propeller blade is designed so that it can't be
removed without the use of a tool. The fixing is
achieved with screws (see fig. 1). The possible
causes that may lead to maintenance of the
protection mesh:
15 | © Munters AB, 2019
After performing repair,