Applications; Direct Vent Installation Of Exhaust And Intake - Westinghouse WGR-076 Series Installation, Start-Up, Maintenance, Parts, Warranty

20
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 water heater 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 heater 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 2.
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.
TWO PIPE SIDEWALL VENTING WITH TEE (INTAKE)
Figure 8 - Two Pipe Roof and Sidewall Venting with Included
Equipment (Tee and Coupling)
WHL-001 Rev. 3.16.15
AND COUPLING (EXHAUST)
SIDEWALL VENTING WITH KIT
SIDEWALL VENTING WITH
CONCENTRIC VENT KIT
ROOF VENTING WITH CONCENTRIC VENT KIT
Figure 9 - Venting with Optional Kits (NOT INCLUDED WITH THE
WATER HEATER)
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
heater to allow drainage of condensate. When placing
support brackets on vent piping, the first bracket must be
within 1 foot of the water heater 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 heater.