Indoor Combustion Air In Confined Or Unconfined Space; Prevent Combustion Air Contamination; Removing A Heater From A Common Vent System - Westinghouse WGR-076 Series Installation, Start-Up, Maintenance, Parts, Warranty

2. Indoor Combustion Air 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 2.
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 water
heater input. Never obstruct the supply of combustion air to
the water heater. If the water heater is installed in areas where
indoor air is contaminated (see Table 2) it is imperative that the
water heater be installed as direct vent so that all combustion
air is taken directly from the outdoors into the water heater
intake connection.
Unconfined space is space with volume greater than 50
cubic feet per 1,000 BTU/hr (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 Venting Section for details.
Confined space is space with volume less than 50 cubic feet
per 1,000 BTU/hr (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"
(15cm) 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 (22cm
all appliances in the space, but not less than 100 square inches
(645cm 2 ).
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.
When drawing combustion air from the outside into the
mechanical room, care must be taken to provide adequate
freeze protection.
Failure to provide an adequate supply of fresh combustion
air can cause poisonous flue gases to enter the living space,
resulting in severe personal injury or death. To prevent
combustion air contamination, see Table 2.
F. Prevent Combustion Air Contamination
Install intake air piping for the heater as described in the
Venting Section, this manual. Do not terminate exhaust in
locations that can allow contamination of intake air.
Ensure that the intake air will not contain any of the
contaminants in Table 2. Contaminated air will damage the
heater, resulting in possible substantial property damage,
severe personal injury, or death. For example, do not pipe
intake air near a swimming pool or laundry facilities. These
areas always contain contaminants.
2 /kW) of the total input of
Products to Avoid
Spray cans containing
fluorocarbons
Permanent wave solutions
Chlorinated waxes / cleaners
Chlorine-based swimming pool
chemicals
Calcium chloride used for thawing Refrigeration repair shops
Sodium chloride used for water
softening
Refrigerant leaks
Paint or varnish removers
Hydrochloric or Muriatic acid
Cements and glues
Antistatic fabric softeners used in
clothes dryers
Chlorine-type bleaches, laundry
detergents, and cleaning solvents
Adhesives used to fasten building
products
Table 2 - Products and Areas Likely to Have Contaminants
NOTE: DAMAGE TO THE HEATER CAUSED BY EXPOSURE
TO CORROSIVE VAPORS IS NOT COVERED BY WARRANTY.
(Refer to the limited warranty for complete terms and
conditions.)
G. Removing a Heater from a Common Vent System
Do not install the heater into a common vent with any other
appliance. This will cause flue gas spillage or appliance
malfunction, resulting in possible substantial property damage,
severe personal injury, or death.
Failure to follow all instructions can result in flue gas spillage
and carbon monoxide emissions, causing severe personal injury
or death.
When removing an existing heater, follow the steps below.
1. Seal any unused openings in the common venting system.
2. Visually inspect the venting system for proper size and
horizontal pitch to determine if there is blockage, leakage,
corrosion, or other deficiencies that could cause an unsafe
condition.
3. If practical, close all building doors, windows, and doors
between the space in which the water heater remains connected
to the common venting system and other spaces in the building.
Turn on clothes dryers and any appliances not connected to
the common venting system. Turn on any exhaust fans, such as
range hoods and bathroom exhausts, at maximum speed. Do
not operate a summer exhaust fan. Close all fireplace dampers.
4. Place in operation the appliance being inspected. Follow the
lighting instructions. Adjust the thermostat so the appliance will
operate continuously.
5. Test for spillage at the draft hood relief opening after 5
minutes of main burner operation. Use the flame of a match or
Areas Likely to Have
Contaminants
Dry cleaning / laundry areas and
establishments
Swimming pools
Metal fabrication plants
Beauty shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and
establishments
New building construction
Remodeling areas
Garages and workshops
WHL-001 Rev. 3.16.15
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