M40
8 / ENGLISH
SERVICE INSTRUCTIONS
The fuel needle is in correct position, when it
is bent to the right (towards the fuel pump). To
prevent the burner chamber cover from
sticking, it is advisable to apply heat resistant
grease on the fixing screws.
Checking the function of the heater
The functioning of the burner must always be
checked after the heater has been serviced.
- Start the heater and let it burn for 15 minutes.
- Check through the inspection window that the
heat radiator is glowing red and that the fla-
me is burning smoothly.
- There should be many separate flames with
smooth edges in the burner. The flame may
be either all blue or blue and yellow.
- If the flame is burning smoothly and the heat
radiator is red, the burner and heater are fun-
ctioning normally.
- If the flames cannot be discerned from each
other or if the flames are all yellow or entang-
led, there are air leakages in the burner. In
this case, reopen the heater and check all
the burner joints for air leakages.
- An unstable burner flame during operation is
probably a sign that the burner needs clea-
ning.
Fuel system and electronics card
Measuring the fuel feed
If any parts of the fuel system have been repla-
ced, the fuel feed of the heater must be
checked by measuring it.
1. Start the heater at full capacity.
2. Pour some fuel into a measuring glass, e.g.
50 ml. Place the fuel pipe into the measuring
glass and start the clock at the same time.
3. Take the fuel pipe out of the measuring glass
after six minutes.
4. Multiply the amount of fuel in millilitres con-
sumed in six minutes by ten to obtain the fuel
consumption per hour. Normal fuel consump-
tion at full capacity is 0.4 ± 0.02 l/h.
5. Compare the measured value with the nor-
mal value; if there are differences, adjust the
fuel feed by turning the trimmer shown in fig.
17.
At the same time, it is easy to check the po-
wer adjustment of the heater.
Fig. 16: Fuel system parts.
Fuel feed
pipe
Fuel pump
Male connector for suction hose
Fuel suction hose
F i l t e r
head
Protecti-
ve spiral
T0209
