Use and Care Manual

26
DO NOT PLACE
DRYER IN PROXIMITY
TO WATER HEATER
Figure 12 – Do Not Install in a Contaminated Space
4. Power Venting, Indoor Combustion Air Installation in
Conned or Unconned Space
This heater requires fresh, uncontaminated air for safe
operation and must be installed in a mechanical room where
there is adequate combustion and ventilating air. NOTE: To
prevent combustion air contamination, see Table 8.
Combustion air from the indoor space can be used if the
space has adequate area or when air is provided through a
duct or louver to supply sufcient combustion air based on
the heater input. Never obstruct the supply of combustion air
to the heater. If the heater is installed in areas where indoor
air is contaminated (see Figure 13) it is imperative that the
heater be installed as direct vent so that all combustion air
is taken directly from the outdoors into the heater intake
connection.
Unconfined space is space with volume greater than 50
cubic feet per 1,000 Btu/hour (4.8 cubic meters per kW) of
the total input rating of all fuel-burning appliances installed in
that space. Rooms connected directly to this space, through
openings not furnished with doors, are considered part of the
space.
Confined space is space with volume less than 50 cubic
feet per 1,000 Btu/hour (4.8 cubic meters per kW) of the
total input rating of all fuel-burning appliances installed in
that space. Rooms connected directly to this space, through
openings not furnished with doors, are considered part of the
space.
When drawing combustion air from inside a conventionally
constructed building to a conned space, such space should
be provided with two permanent openings: one located 6"
(15 cm) below the space ceiling, the other 6" (15cm) above
the space oor.Each opening should have a free area of one
square inch per 1,000 Btu/hr (22㎠/kW) of the total input
of all appliances in the space, but not less than 100 square
inches (645㎠).
If the conned space is within a building of tight construction,
air for combustion must be obtained from the outdoors as
outlined in the Venting section of this manual.See Figure 13.
WARNING
Breathing Hazard – Carbon Monoxide Gas
Breathing carbon monoxide can cause brain damage or death.
Always read and understand instruction manual.
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Do not operate heater if ood damaged.
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Install vent system in accordance with local codes
and manufacturers installation instructions.
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Do not obstruct heater air intake or exhaust,
Support all vent piping per manufacturers
installation instructions.
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Do not place chemical vapor emitting products
near unit.
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According to NFPA 720, carbon monoxides
detectors should be installed outside each sleeping
area.
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Never operate the heater unless it is vented to the
outdoors.
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Analyze the entire vent system to make sure that
condensate will not become trapped in a section
of vent pipe and therefore reduce the open cross
sectional area of the vent.