HTP 399M - Manual (Page 16)

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The boiler is rated ANSI Z21.13 Category IV (pressurized vent, likely to form condensate in the vent) and requires a special vent
system designed for pressurized venting.
You must also install intake piping from outdoors to the boiler flue adaptor. The resultant installation is categorized as direct vent
(sealed combustion). NOTE: To prevent combustion air contamination, see Table 2.
Exhaust and intake must terminate near each other and may be vented vertically through the roof or out a side wall. Exhaust vent and
intake piping methods are detailed in the Venting Section. Do not attempt to install the boiler using any other means. Be sure to locate
the boiler such that the exhaust vent and intake piping can be routed through the building and properly terminated. The exhaust vent
and intake piping lengths, routing and termination method must all comply with the methods and limits given in the venting section.
F. PREVENT COMBUSTION AIR CONTAMINATION
Install intake air piping for the boiler as described in the Venting section. Do not terminate exhaust in locations that can allow
contamination of intake air.
PRODUCTS TO AVOID
AREAS LIKELY TO HAVE CONTAMINANTS
Spray cans containing fluorocarbons Dry cleaning/laundry areas and establishments
Permanent wave solutions Swimming pools
Chlorinated waxes/cleaners Metal fabrication plants
Chlorine-based swimming pool chemicals Beauty shops
Calcium chloride used for thawing Refrigeration repair shops
Sodium chloride used for water softening Photo processing plants
Refrigerant leaks Auto body shops
Paint or varnish removers Plastic manufacturing plants
Hydrochloric or Muriatic acid Furniture refinishing areas and establishments
Cements and glues New building construction
Antistatic fabric softeners used in clothes dryers Remodeling areas
Chlorine-type bleaches, laundry detergents, and cleaning solvents Garages and workshops
Adhesives used to fasten building products
Table 2 - Contaminant Table
You must pipe outside air to the boiler air intake. Ensure that the intake air will not contain any of the contaminants listed in Table 2. For
example, do not pipe intake air near a swimming pool. Also, avoid areas subject to exhaust fumes from laundry facilities. These areas
always contain contaminants. Contaminated air will damage the boiler, resulting in possible substantial property damage, severe
personal injury, or death.
G. REMOVING AN EXISTING BOILER FROM AN EXISTING COMMON VENT SYSTEM
Do not install the boiler 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 boiler, follow the steps below with each
appliance remaining connected to the common venting system in
operation, while other appliances remaining connected to common
venting system are not operating.
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
NOTE: DAMAGE TO THE BOILER CAUSED BY EXPOSURE TO CORROSIVE VAPORS IS NOT COVERED BY WARRANTY.
(Refer to the limited warranty for complete terms and conditions).
Figure 5