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This type of heater provides the maximum efficiency in a limited space while maintai-
ning an almost unique feature, as a matter of fact, thanks to a ventilated chamber and
another chamber that acts as insulation, is able to maintain very low outside tempera-
tures during full operation.
All the metal parts subject to the extremely high combustion temperatures are made
of stainless steel. The coil creates fume passages to achieve the best possible combu-
stion without sacrificing efficiency.
Heater cleaning
Remove the heater cover and clean the soot from the inside, remove the heating coil
and clean it with a pressure washer to remove, also in this case, any soot attached to it.
Perform this operation only if necessary.
HEATER ADjUSTMENT
Adjustment made by the manufacturer is valid in most cases on average use condi-
tions. There are some factors that may require a variation of the pre-set adjustment
done by the manufacturer.
Low temperature of fuel and air
.
Decreasing of temperature causes an increase of fuel viscosity (viscosity is fuel resi-
stance when it is moved); it follows that you get a poor atomization, and then a non-
optimal combustion and, in some cases, ignition problems. Furthermore, paraffin that
can be found in the fuel, with low temperature, can crystallize, causing the obstruc-
tion of filters, of small pipes and nozzle. The most suitable action is not to change
the adjustment of combustion but, rather, is to protect the pressure washer from cold
weather.
Altitude or high air temperature
.
Burner fan provides combustion air by volume (m3); with high air temperature and/or
high altitude, weight of the air for each m3 (specific weight) is lower, then percentage
of oxygen in the same will be lower too, which for its weight it chemically combines by
percentages, always referring to its weight, with fuel carbon and hydrogen: there will
be then ignition lacking in air.
If variables above mentioned are of little importance, you can compensate for them by
slightly increasing amount of air sucked by the fan, through its opening, or as alterna-
tive, by decreasing fuel pressure and thus the flow. This operation reduces, in general,
also combustion noise level. Pressure decrease, however, in addition to a negligible
decrease of the water temperature, causes, especially if combustion is excessively vi-
scous, a poor atomizing and combustion and then ignition problems. To remedy to
what mentioned above, it will be better to replace the nozzle with a similar one but
with a flow immediately lower, leaving unchanged the pressure. Normally, pressure of
fuel to nozzle is calibrated on 9.5 bar + / -0.5. Varying flow rate of the fuel, you will have
to regulate air flow too. Air should not be too much, because while it gets warm, it re-
moves calories from the combustion disturbing, inside pre-combustion cone, ignition
and proper mixing with the fuel.
9 - MAINTENANCE
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