Lochinvar Knight 80 - 285 - Manual (Page 27)

Installation & Operation Manual
27
5
Vertical direct venting
(continued)
Vertical termination – optional concentric vent
Figure 5-6 Concentric Vent Roof Installation
Ensure termination height is above the
roof surface or anticipated snow level
(12 inches in U.S.A. or 18 inches in
Canada) as shown in FIG. 5-4, page 26.
If assembly is too short to meet 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 CVK3003 and
standard schedule 40 PVC for
CVK3007. Do not extend dimension
D* more than 60 inches (see FIG.’s 4-9
and 4-10, page 22).
CAUTION
DO NOT use field-supplied couplings to
extend pipes. Airflow restriction will
occur.
8. 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 #CVK3003 installations and
fastened tightly into the rubber adapter for #CVK3007
installations.
9. Cement the appliance combustion air and vent pipes to
the concentric vent termination assembly. See FIG. 5-6
for proper pipe attachment.
10. 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. 5-7). 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. 5-7. The next two (2) terminations
must be at least 36 inches away from the first two (2)
terminations. It is important that vent terminations be made
as shown to avoid recirculation of flue gases. Dimension A in
FIG. 5-7 represents the distance between pipes or rain shields,
as touching or a 2 inch maximum separation.
Figure 5-7 Concentric Vent and Combustion Air Vertical
Termination (Dimension A as Touching or 2 inches
Maximum Separation)
Do not operate the appliance with 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.
6. 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
to accumulate inside the pipe assembly
when installing through the hole.
7. Secure the assembly to the roof structure as shown below
in FIG. 5-6 using field supplied metal strapping or
equivalent support material.
ƽ WARNING
NOTICE
NOTICE
NOTICE
Note: CVK3003 shown for illustration purposes.