Air For Combustion; Direct Outside Air For Combustion - Space-Ray PTS Series 100 Installation And Operation Instructions Manual

Infrared radiant tube heater two stage push through system (positive pressure)

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17.0)

AIR FOR COMBUSTION

If indoor combustion air is to be supplied for a tightly enclosed area, one square inch of free area opening shall be

provided below the heater for each 1,000 Btu/hr of heater input. Adequate clearances around the air inlet screen

must be maintained at all times. In larger open areas of buildings, infiltration normally is adequate to provide air for

combustion.

17.1)

Outside combustion air should be supplied directly to the heater when the building is subject to negative pressure, or

when contaminants or high humidity are present in the building air. These contaminants include paints, solvents,

corrosive vapors or any other foreign particles that may cause damage to the heater or result in poor combustion.

Outside combustion air can be brought directly to the heater by a 4" diameter duct less than 50 ft. long or equivalent

(see table in Section 16). This is attached to the 4" diameter starting collar (supplied with heater). The starting collar

is fitted to the rear of the burner box cabinet as shown below. An approved vent cap must be placed directly on the

end of the outside combustion air inlet pipe. The combustion air inlet should be not less than 3 ft. (0.9m), either

vertically or horizontally, from the flue vent termination. The air intake terminal must be located not less than 1 ft.

(30cm) above grade. It is good installation practice to supply combustion air from the same pressure zone as the

vent outlet. Avoid bringing combustion air to the heater from an attic space. There is no guarantee that adequate

combustion air will be supplied.

If the heater is installed less than 2 ft. from the ceiling, a combustion air inlet kit PN 44129510 must be provided to

allow for expansion/contraction of straight tube heaters (PTS series).

In colder climates, where necessary, insulate the outside combustion air duct. In high humidity applications, the

burner box should be sealed with silicone sealer.

–38–

Form #43343530

JJuly 08

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