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CAUTION
Do not start the vent run with a street elbow at
the vent collar. Using a street elbow directly at
the collar will not allow for a tight seal between
the appliance and vent pipe. A length of straight
pipe must be used when starting the vent run.
The length of vent pipe from the unit
Note
to the common vent main trunk pipe
must not exceed 16' of equivalent
length.
9.3.3 Assembling the Wye Joint
1. Assemble the hub wye, the 2" reducer, and the
90º elbow into the common vent. You can also
use the hub reducing wye and the 90º elbow to
assemble the common vent. Apply the proper
solvent cement to the mating surfaces.
Tees can also be used instead of wye
Note
fittings as part of the common vent.
Apply Cement
Apply Cement
[Hub Wye, 2" Reducer, 90˚ Elbow]
Apply Cement
[Hub Reducing Wye and 90˚ Elbow]
Multiple reducers can be used to allow
Note
proper connection of 2" vent pipe to
the common vent system.
2. Assemble the wye joint or wye assembly to the
vent pipe. Apply solvent cement to the mating
surfaces.
Apply
Cement
[Hub Wye Assembly]
Apply
Cement
[Hub Reducing Wye Assembly]
The options shown here are only
Note
examples. The setup you choose will
vary based on the installation location,
local building codes, and other factors.
The installer is responsible for all
equipment and detailing required by
local codes.
DANGER
If the connections leak, harmful flue gas may
cause personal injury or death. After completing
the installation and filling the water heater
with water, turn on the boiler and test for leaks
using a bubble test kit. After applying the soap
solution, bubbles will form on the connection if
any leaks exist.
Installing a Common Vent System
85
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