AM Series Boiler & Water Heater User Manual
CHAPTER 6: INSTALL
– VENT & COMBUSTION AIR PIPING
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11/15/2019
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6.2 General Venting and Air Piping Systems
The AM Series of boilers and water heaters requires a special vent system, designed for
pressurized venting.
The unit is to be used for either direct vent installation or for installation using room combustion
air. When room air is considered, see example #6 in Figure 6-1 for an example of such a
venting configuration.
Vent and air must terminate near one another and may be vented vertically through the roof or
out a side wall, unless otherwise specified. You may use any of the vent/air piping methods from
Figure 6-1.
Be sure to locate the unit such that the vent and air piping can be routed through the building
and properly terminated. The vent/air piping lengths, routing and termination method must all
comply with the methods and limits given in Chapter 6.
The vent installation must be in accordance with part Venting of Appliances, of the latest edition
of the National Fuel Gas Code, ANSI Z223.1/NFPA 54 or section, Venting Systems and Air
Supply for Appliances, of the CAN/CSA B149.1, Natural Gas and Propane Installation code or
applicable provisions of the local building codes.
All vent pipes must be mechanically fixed.
The exhaust vent and the air inlet lines must be supported to prevent sagging. To do this, use a
suitable pipe clamp to support the lines. Pipe clamps shall support the line every 3 feet (1
meter). Provide a support at each elbow. Pipe clamp shall be fixed with use of a wall stud.
DO NOT mix components from different systems. The vent system could fail, causing leakage
of flue products into the living space. Use only approved materials listed on Tables 3-3 and 3-4.
Use of cellular core PVC and CPVC, or Radel, for venting system is
NOT
allowed.
Improper venting due to failure to comply with the warnings above can result in
excessive levels of carbon monoxide!
The exhaust pipe must be pitched a minimum of a 1/4 inch per foot back to the boiler (to allow
drainage of condensate).
The vent system shall be installed so as to prevent the accumulation of condensate.
Due to the high efficiency of the unit it may discharge what looks like white smoke especially
when the outside air temperature is cold. This is a simply water vapor, a purely natural
phenomenon and not a reason for concern.
