Installation
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15
Combustion Air Supply
Asphyxiation risk! The combustion air required for the heater may only be drawn in
from the outside or from spaces that are not occupied by persons e.g. ventilated
foredeck box or ventilated *engine compartment (Diesel only).
The combustion air intake line (internal diameter at least 3.2” (80 mm) may be 1 1/2” (0.5 m) to 16 1/2” (5 m) long with
several bends totalling 360°. The minimum bending radius is 1 3/4” (45 mm). The combustion air intake must not be routed
above the exhaust outlet.
Where combustion air is drawn from an internal source, the combustion air tube should be routed away from the heater
with a downward pitch to prevent condensation or moisture from collecting in the tube.
Where combustion air is drawn from an external source, the end of the combustion air intake tube must be routed with a
goose-neck bend with a downward pitch toward the outlet so any water that may penetrate, can drain out and not into the
heater. A 3/16 in. (5mm) condensation weep hole must be provided at the lowest point between the goose-neck to allow
drainage of any trapped condensation or splash water.
Keep combustion air intake tube opening clear of obstructions!
To avoid pressure differences between exhaust gas outlet and combustion air inlet, the openings of the through-hull fittings
should be located in an area where equal pressure prevails. Do not point the inlet of the combustion air tube in the direction
of travel when intake air is drawn from an external source.
Secure the intake tube to the heater with the provided hose clamps. Secure the tube to the adjacent structures with P-clips
or nylon wire ties.
WARNING
CAUTION
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