whl-648 Rev. 001 Rel. 003 Date 10.8.19
37
Figure 26 - Do Not Place Boiler Near Dryer
Figure 27 - Power Venting, Indoor and Outdoor Combustion Air - Single Pipe
NOTE:
These drawings are meant to demonstrate system venting only. The installer is responsible for all equipment and detailing required
by local codes.
3. Power Venting, Indoor Combustion Air in Confined or Unconfined Space
This appliance 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 7.
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 Figure 26) 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.
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 1,000 Btu/hr (22cm2/kW) of the total
input of all appliances in the space, but not less than 100 square inches
(645cm2).
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 of this manual. See Figure 27.
Summary of Contents for WBRC 140 Series
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