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1. DIRECT VENT INSTALLATION OF EXHAUST AND INTAKE
If installing a direct vent option, combustion air must be drawn from the outdoors directly into the
appliance intake, and exhaust must terminate outside. There are three basic direct vent options detailed
in this manual: 1. Side Wall Venting, 2. Roof Venting, and 3. Unbalanced Venting.
Be sure to locate the heater such that the air intake and exhaust vent piping can be routed through the
building and properly terminated. Different vent terminals can be used to simplify and eliminate multiple
penetrations in the building structure (see Optional Equipment in Venting Section). The air intake and
exhaust vent piping lengths, routing and termination methods must all comply with the methods and limits
given in the Venting section, Part 8 of this manual.
When installing a combustion air intake from outdoors, care must be taken to utilize uncontaminated
combustion air. NOTE: To prevent combustion air contamination, see Table 1.
2. INDOOR COMBUSTION AIR INSTALLATION IN CONFINED OR UNCONFINED 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 1.
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 sufficient combustion air based on the appliance input. Never obstruct
the supply of combustion air to the appliance. If the appliance is installed in areas where indoor air is
contaminated (see Table 1) it is imperative that the appliance be installed as direct vent so that all
combustion air is taken directly from the outdoors into the appliance 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. See
Figure 16 on page 38 for installation diagram.
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 confined 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 floor. Each opening should have a free area of one square inch per
2
1,000 Btu/hr (22cm
/kW) of the total input of all appliances in the space, but not less than 100 square
2
inches (645cm
).
If the confined space is within a building of tight construction, air for combustion must be obtained from
the outdoors as outlined in the Venting Section, Part 8 of this manual.
When drawing combustion air from the outside into the mechanical room, care must be taken to provide
adequate freeze protection.
Do not attempt to vent this appliance by any means other than those described in this manual. Doing so
will void the warranty, and may result in severe personal injury or death.
15
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