WHL-016 Rev. 4.14.16
33
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.
NOTE:
These drawings are meant to demonstrate system
venting only. The installer is responsible for all equipment and
detailing required by local codes.
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
Minimum Existing Vent / Chase Size
3”
5”
4”
7”
Table 12 - 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.
Figure 20 - Unbalanced Venting - Roof Exhaust and Sidewall
Intake
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 12 for proper minimum
vent sizing. Use only the approved venting materials specified
in Table 8 for piping the system. All instructions listed in this
Venting section apply. See Figures 21-1 and 21-2 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 21-3 for
chase venting demonstration.
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.
Summary of Contents for WBC 399
Page 14: ...WHL 016 Rev 4 14 16 14 Figure 6 Boiler Dimensions NOTE All Dimensions Are Approximate 055 080 ...
Page 21: ...WHL 016 Rev 4 14 16 21 Figure 9 Piping Symbol Legend ...
Page 42: ...WHL 016 Rev 4 14 16 42 Figure 33 Internal Connection Diagram ...
Page 65: ...WHL 016 Rev 4 14 16 65 Figure 37 Combustion System Replacement Parts 55 110kBTU Models ...
Page 67: ...WHL 016 Rev 4 14 16 67 Figure 39 Combustion System Replacement Parts 155 399kBTU Models ...
