HTP EFT-399 - Manual (Page 46)

46
LP-387 REV. 6.10.14
K. VENTING THROUGH AN EXISTING SYSTEM
This boiler may be vented through an existing unused vent system. The inner diameter of the existing vent system is utilized for the
combustion air source. Two methods have been approved for such venting: Concentric Venting and Venting as a Chase.
Do not install the boiler into a common existing vent with any other boiler. This will cause flue gas spillage or boiler malfunction,
resulting in substantial property damage, severe personal injury, or death.
Contractors must check state and local codes before installing through an existing vent opening. State and local codes always take
precedence over manufacturer’s instructions. Failure to check state and local codes before installing through an existing opening could
result in property damage and add significantly to installation costs.
1. CONCENTRIC VENTING
Concentric venting must run vertically through the roof. See Section E, Venting Section, for proper minimum vent sizing. Use only the
approved venting materials specified in Table 10 for piping the system. All instructions listed in Part 6 - Venting, apply. See Figures 24-
1 and 24-2 for venting demonstrations.
The upper and lower vent terminations as well as all joints in the venting system must be properly sealed to ensure that all combustion
air is drawn properly and exhaust does not leak from the system. Failure to properly seal the venting system will result in property
damage, severe personal injury, or death.
If an existing venting system is converted for use with this boiler, the installer must ensure that the existing venting system is clean and
free from particulate contamination that could damage the boiler. Failure to do so could result in property damage and boiler failure.
Such failure IS NOT covered under warranty.
Figure 24 – 1, 24 - 2 Concentric Venting NOTE: Drawing is meant to demonstrate system venting ONLY.