Venting Through An Existing System - Westinghouse WBRE80 User Manual

30
Unbalanced Flue /
Vertical Vent
Figure 16 - Unbalanced Venting - Roof Exhaust and Sidewall Intake
NOTE: These drawings are meant to demonstrate system
venting only. The installer is responsible for all equipment and
detailing required by local codes.
All vent pipes must be glued, properly supported, and the
exhaust pitched a minimum of 1/4" per foot back to the boiler to
allow drainage of condensate. When placing support brackets
on vent piping, the first bracket must be within 1 foot of the
boiler and the balance of 4 foot intervals on the vent pipe.
Venting must be readily accessible for visual inspection from
the first three feet from the boiler.
An unbalanced vent system can be installed ONLY when the
exhaust is in the vertical position. Failure to do so could result in
serious personal injury or death.

2. 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 Through an
Existing System and Venting as a Chase.
Vent / Air Intake Size
3"
4"
Table 13 - Minimum Existing Vent / Chase Sizing
Do not install the boiler into a common existing vent with
any other appliance. This will cause flue gas spillage or boiler
malfunction, resulting in substantial property damage, serious
personal injury, or death.
WHL-052 Rev. 4.28.16
Minimum Existing Vent / Chase Size
5"
7"
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.
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.
Concentric Venting Through an Existing System
NOTE: The following instructions refer only to venting
through an existing vent system, and not to venting with
Westinghouse's optional concentric vent kits. Refer to
Concentric Vent Kit installation manual (LP-166) for further
information on venting with the optional concentric vent kits.
Concentric venting through an existing system must run
vertically through the roof. See Table 13 for proper minimum
vent sizing. Use only the approved venting materials specified
in Table 9 for piping the system. All instructions listed in this
Venting section apply. See Figures 17-1 and 17-2 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, serious personal injury, or
death.
Chase Venting Through an Existing System
When venting as a chase, follow all instructions included in this
Venting section, including those in the previous Concentric
Venting Through an Existing System section. See Figure 17-3
for chase venting demonstration.