Version 2: March 2020
11
manual: 0009 0231EN
Dust filter (F-models)
Dust filters (11) must be checked a few times during the heating season and cleaned in case needed. Remove
a filter before cleaning. Brush the surface gently with a brush or clean it with compressed air from inside to the
outside. In case the dust is greasy, clean the filter in warm water with a bit detergent. Make sure that filters are
dry before replacing them. For heaters with a dust filter still check the venturi (10, 33) inside regularly while very
fine dust still will pass the filter and pollute the heater internally.
Order of maintenance
• First clean the heater and filters (11) as described above.
• Clean the reflector (24,25,30,31,37,45) and other parts with water, mild detergent and a cloth or soft brush.
• Clean the inside of the venturi (10,35) and burner tube via the connection piece (9,32) with compressed air
and a tube brush. Repeat this 3 times to be sure that all the dust is removed.
• Carefully inspect the burner ceramics on damage, cracks and holes and if they are still mounted properly.
Replace when needed. To clean the burner ceramics, use low pressure air. Clean first the ceramic stones
with air from the front side through the gauze. Then clean the inside of the burner with air via the venturi
tube. Do not use compressed air above 2 bar because higher pressure will damage the ceramic stones.
Never clean the burner stones with water.
• Check the gas injector for obstructions. Remove obstructions by brushing them away and by using a pin or
drill to clean the injector hole. Make sure that the injector hole does not become wider by using a pin or drill
that is larger than the size stamped on the side of the injector.
• Clean the inside of the gas safety device (12, 13, 14, 15) and injector with compressed air. Make sure that
the pressure of the compressed air is not higher than the 0,5 bar. Otherwise the rubber seals inside the
safety device will become damaged.
• Check the condition of the thermocouple tip (19, 42). Replace in case the tip is burnt-in already to avoid
unnecessary shut down later on. See additional information for the location of the thermocouple.
• Check the condition of the spark plug (18, 40); no cracks of the ceramic and a spark gap of 3-4 mm. Check
if the metal spark wire and earthing wire still makes a 90 degrees angle directly above the ceramics and are
not bending away to larger angles.
• Clean the ignition device and check the connection of the ignition wire for proper contact and waterproofing.
Check if the ignition wire is not damaged and has no cracks.
• Check all gas carrying parts and connections for gas tightness with leak detection liquid or soapy water
according the procedure in the standards applicable at the local installation situation. Never use a flame for
soundness checks!
• In case a gas hose is used, check this carefully for cracks, wear and other signs of damage or alteration.
Replace it also when the maximum lifetime printed on the hose, or the maximum lifetime allowed by local
requirements, has been passed.
• Commission the heater after maintenance and check it carefully during first ignition, firing and extinguishing.
In case the heaters need to be stored for a long time, make sure that no dust, spiders, etc. can enter the heater.
Use the carton packaging box to store the heater, or a plastic bag if the box is not available anymore, and close
this carefully.
Consumable parts
Thermocouples (19 or 42) and the magnet unit (8) inside the gas safety device are the most important parts
that maybe requires replacement during normal operational life. See the parts list for more information.
Replacement thermocouple and magnet unit
- Remove the thermocouple (19, 42) by unscrewing the nut M8 at the gas safety device or Ei (12, 13, 14 or 15).
- Unscrew the thermocouple extension (7) at the gas safety device (12, 13, 14 or 15).
- Unscrew the nut for connection of the thermocouple (or thermocouple extension) at the gas safety device (12,
13, 14 or 15).
- Remove the broken magnet unit (8) and replace by a new one.
- Replace the nut for connection of the thermocouple (or thermocouple extension) and close carefully (firmly but
not excessive) to avoid gas leakage.
- Loosen the nuts M8x1 (2x) at the tip of the thermocouple and remove the thermocouple from the reflector.
- Replace with a new thermocouple until the position as indicated in the drawings below. Tighten nut M8x1 (2x)
to secure the thermocouple in place.
- Bend the new thermocouple in the identical shape as the old one the and screw the thermocouple nut M8 in
the nut of the gas safety device (12 or 13) or the Ei (14 or 15). Hand-tight first and then an additional 1/6 turn.
- Carefully check the gas safety device for gas leakage before taking back into operation.
