6
Retrofitting
For replacing different brand of heater for an AUTOTERM AIR heater, following
things must to be checked first:
Diameter of exhaust pipe.
The AIR-2D and AIR-4D have an exhaust pipe with an internal diameter of 24mm and
AIR-8D and AIR-9D have an exhaust pipe with an internal diameter of 38mm.
Some brands use different diameter exhaust pipes, if so, it needs to be changed to
necessary diameter suitable for the heater in use. Larger diameters can be used, if needed.
(see “Section 3.3”, for more information on installing the exhaust pipe).
Disregard of this advice can lead to insufficient output of exhaust gases due
to backpressure, thus damaging the heater.
Fuel system.
When retrofitting a heater, all old fuel pipes and fuel pumps must be removed
completely and suitable fuel system for AUTOTERM AIR heater must be installed instead.
Different brands of fuel pumps can have different fuel output and fuel pipes can be in
different diameter. (see “Section 3.4”, for more information on installing the fuel system).
Disregard of this advice can cause fuel overflow in the heater or insufficient
flow of fuel, thus damaging the heater.
Electrical wiring.
All old wiring, electrical connections, control panels, etc. must be removed and
installed with new AUTOTERM AIR suitable components. (see “Section 3.5”, for more
information on installing the wiring of the heater).
Electrical related faults are common when using different and unsuitable
electrical components.
Diameter of air ducts.
At least 60mm air duct must be used for AIR-2D, at least 90mm air duct for AIR-4D,
and at least 100mm for AIR-9D. If the existing air duct is smaller in diameter, then
everything must be changed up to the first branch with the necessary diameter and as well
as the first hot air outlet. After that the size of air duct can be decreased using different
adapters (see “Section 5”, for more information on air ducting).
Disregard of this advice can cause the heater to overheat, thus damaging it.
DO NOT connect air ducts to AIR-8D.
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