Operating instructions

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• The exhaust outlet must end in the open air.
• The exhaust pipe must not protrude beyond the lateral limits of
the vehicle.
• Install the exhaust pipe sloping slightly downwards.
If necessary, make a drain hole approx. Ø 5 mm at the lowest
point to drain off condensation.
• Important functional parts of the vehicle must not be impaired
(keep sufficient clearance).
• Mount the exhaust pipe with sufficient clearance to heat-sen-
sitive parts. Pay particular attention to fuel pipes (plastic or
metal), electrical cables and brake hoses etc.!
• Exhaust pipes must be fastened safely (recommended clear-
ance of 50 cm) to avoid damage from vibrations.
• Route the exhaust system so that the emitted fumes are not
sucked in with the combustion air.
• The mouth of the exhaust pipe must not get clogged by dirt
and snow.
• The mouth of the exhaust pipe must not point in the direction
of travel.
• Always fasten silencer to the vehicle.
• The exhaust end pipe should be much shorter than the flexible
exhaust pipe from the heater to the exhaust silencer.
Fuel Quality
This means that difficulties are only to be expected for extreme
drops in temperature, as also apply to the vehicle engine. Please
also refer to the vehicle manual.
If no special diesel fuel is available for low temperatures, then
kerosene or gasoline should be mixed with the fuel according to
the following table:
Temperature Winterdiesel Addition
0 °C to –25 °C 100 % –
(32 °F to –13 °F) 100 % –
–25 °C to –40 °C 50 %* 50 % paraffin or petrol
(32 °F to –13 °F) 50 %* –
* or 100 % special cold diesel fuel (Arctic diesel).
Caution: The coolant must contain a minimum of 10%
antifreeze at all times as protection against
corrosion.
Fresh water will corrode internal heater parts.
Note: HYDRONIC M8 Biodiesel
The heater is approved for operation with biodiesel up to a temperature of – 8°C (17.5°F) (the flowability reduces at tempera-
tures below 0 °C (35°F)).
• When using 100 % biodiesel, the heater should be run on diesel fuel twice a year (in the middle and at the end of a heating
period) to burn off possibly accumulated biodiesel deposits.To do so, let the vehicle tank run almost empty and fill with diesel fuel
without adding any biodiesel. While running on this tank filling, switch the heater on 2 to 3 times for 30 minutes at a time at the
highest temperature setting.
• If constantly operated with diesel / biodiesel mixtures of up to 50 % biodiesel, intermediate operation with pure diesel fuel is not
necessary.
HYDRONIC M10 / HYDRONIC M12
Both heaters are not approved for operation with biodiesel. Up to 10 % biodiesel may be added.