Caltech Calaer 2 kW, Installation Manual

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10. Combustion air and exhaust system
27
10. Combustion air and exhaust
system
10.1 Combustion air intake
The combustion air intake is located near the main heating air intake of the
heater. The maximum length of the combustion air intake tube is 2 meters
(6.4 feet). The total radius of the bends should not exceed 270 degrees.
The combustion air can be drawn from outside (recommended) or from a
well ventilated internal source.
When drawing the combustion air from an internal source the line should be
mounted on a slanting angle away from the heater to avoid condensation
traveling to the heater intake. The air intake should not be pointed in the
direction of travel
When drawing air form an external source the intake line should be
mounted with a goose-neck bend just before the heater. In the bottom of
the goose neck make a small drainage hole (5 mm or 3/16 inch) that will
allow water to escape the line before reaching the heater.