Applications; Direct Vent Installation Of Exhaust And Intake - Westinghouse WBMC**500 Manual

26
over existing chimney openings.
13. All piping must be fully supported. Use pipe hangers at a
minimum of 4 foot intervals to prevent sagging of the pipe
where condensate may form.
14. Do not use the boiler to support any piping.
15. Ensure the outdoor exhaust vent termination is screened to
prevent blockage caused by debris or birds.
16. Ensure the outdoor intake pipe termination is screened to
prevent blockage caused by debris or birds.
H. Applications

1. Direct Vent Installation of Exhaust and Intake

If installing a direct vent option, combustion air must be drawn
from the outdoors directly into the boiler intake, and exhaust
must terminate outside. There are three basic direct vent
options detailed in this manual: 1. Side Wall Venting, 2. Roof
Venting, and 3. Unbalanced Venting.
Be sure to locate the boiler such that the exhaust vent and
intake pipe can be routed through the building and properly
terminated. Different vent terminals can be used to simplify and
eliminate multiple penetrations in the building structure (see
Optional Equipment in Venting Section). The exhaust vent and
intake pipe lengths, routing and termination methods must all
comply with the methods and limits given in the Venting section
of this manual.
When installing a combustion air intake from outdoors, care
must be taken to utilize uncontaminated combustion air. NOTE:
To prevent combustion air contamination, see Table 1.
Take extra precaution to adequately support the weight of vent
pipes terminating through the roof. Failure to properly support
roof terminated piping could result in property damage, serious
injury, or death.
WHL-033 Rev. 1.29.16
Two Pipe Roof Venting with
Intake (Elbow) and
Exhaust (Coupling)
Two Pipe Sidewall Venting
with Intake (Elbow) and
Coupling (Exhaust)
EXHAUST
Insert Intake/Exhaust
Screen into Coupling
MAINTAIN 12" MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW LEVEL
OR GRADE, WHICHEVER IS
GREATER (TYP)
LP-505-A
06/23/15
Figure 12 - Two Pipe Roof and Sidewall Venting
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.
EXTERIOR WALL
1" MIN.
12" MIN.
INTAKE
Insert Intake/Exhaust Screen
into Open End of Elbow