Prevent Combustion Air Contamination; Removing A Heater From A Common Vent System - Westinghouse WGRGH20**75F Series Installation, Start-Up, Maintenance, Parts, Warranty

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G. 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 6. 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.
Products to Avoid
Spray cans containing fluorocarbons
Permanent wave solutions
Chlorinated waxes / cleaners
Chlorine-based swimming pool chemicals
Calcium chloride used for thawing
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 6 - 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.)
H. 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 candle or smoke
from a cigarette.
6. After it has been determined that each appliance remaining connected to the common venting system properly vents when tested as
outlined, return doors, windows, exhaust fans, fireplace dampers, and any other gas burning appliances to their previous condition of use.
7. Any improper operation of the common venting system should be corrected to conform to the National Fuel Gas Code, ANSI Z223.1. When
resizing any portion of the common venting system, the system should approach the minimum size as determined using the appropriate
tables in Appendix G of ANSI Z223.1.
whl-605 Rev. 002 Rel. 000 Date 1.23.19
Areas Likely to Have Contaminants
Dry cleaning / laundry areas and establishments
Swimming pools
Metal fabrication plants
Beauty shops
Refrigeration repair shops
Photo processing plants
Auto body shops
Plastic manufacturing plants
Furniture refinishing areas and establishments
New building construction
Remodeling areas
Garages and workshops
Figure 2 - CO Warning Label