Lochinvar Shield SWR125 Installation & Service Manual page 36

4
Vertical direct venting
Vertical termination – optional concentric vent
Do not operate the appliance with
⚠ WARNING
the rain cap removed or recirculation
of combustion products may occur.
Water may also collect inside the larger
combustion air pipe and flow to the
burner enclosure. Failure to follow this
warning could result in product damage
or improper operation, personal injury,
or death.
4. Install the Y concentric fitting pipe assembly up through
the structure's hole and field supplied roof boot/flashing.
Do not allow insulation or other materials
NOTICE
to accumulate inside the pipe assembly
when installing through the hole.
5. Secure the assembly to the roof structure as shown
below in FIG. 4-6 using field supplied metal strapping or
equivalent support material.
Figure 4-6 Concentric Vent Roof Installation
Note: 100140480 shown for illustration
purposes.
Ensure termination height is above the
NOTICE
roof surface or anticipated snow level
(12 inches in U.S.A. or 18 inches in
Canada) as shown in FIG. 4-4, page 35.
If assembly is too short to meet
NOTICE
height requirement, the two (2) pipes
supplied in the kit may be replaced
by using the same diameter, field
supplied SDR-26 PVC (D2241) pipe for
#100140480 and standard schedule 40
PVC for #100140484. Do not extend
dimension D* more than 60 inches
(see FIG.'s 3-9 and 3-10, page 31).
36
Installation & Service Manual
DO NOT use field-supplied couplings
CAUTION
to extend pipes. Airflow restriction will
occur.
6. Install the rain cap and the small diameter pipe assembly
into the roof penetration assembly. Ensure the small
diameter pipe is cemented and bottomed in the Y
concentric fitting for #100140480 installations and
fastened tightly into the rubber adapter for #100140484
installations.
7. Cement the appliance combustion air and vent pipes to
the concentric vent termination assembly. See FIG. 4-6
for proper pipe attachment.
8. Operate the appliance through one (1) heat cycle to ensure
combustion air and vent pipes are properly connected to
the concentric vent termination connections.
Multiventing vertical terminations
When two (2) or more direct vent appliances are vented
near each other, each appliance must be individually vented
(see FIG. 4-7). NEVER common vent or breach vent this
appliance. When two (2) or more direct vent appliances
are vented near each other, two (2) vent terminations may
be installed as shown in FIG. 4-7. It is important that vent
terminations be made as shown to avoid recirculation of flue
gases.
Figure 4-7 Concentric Vent and Combustion Air Vertical
Termination
12" (18" FOR CANADA)
MINIMUM CLEARANCE
ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24" ABOVE ROOF.
12"
MINIMUM
(TYPICAL)
COMBUSTION
AIR