34
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
#100274637 installations and fastened tightly into the rubber
adapter for #100274638 installations.
7. Cement the appliance combustion air and vent pipes to the
concentric vent termination assembly. See Figure 49 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.
MULTIPLE VERTICAL TERMINATIONS
When two (2) or more direct vent appliances are vented near
each other, each appliance must be individually vented (see
Figure 50). 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 Figure 50. It is important that vent terminations be made as
shown to avoid recirculation of flue gases.
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.
4. Install the Y concentric fitting pipe assembly up through the
structure’s hole and field supplied roof boot/flashing.
NOTE
: Do not allow insulation or other materials to accumulate
inside the pipe assembly when installing through the hole.
5. Secure the assembly to the roof structure as shown below in
Figure 49 using field supplied metal strapping or equivalent
support material.
Figure 49. Concentric Vent Roof Installation
NOTE
: Ensure termination height is above the roof surface or
anticipated snow level (12 inches in U.S.A.) as shown in Figure
47 on Page 33.
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
100274637 and standard schedule 40 PVC for 100274638. Do
not extend dimension D* more than 60 inches (see Figure’s 36
and 37 on Page 29).
DO NOT use field-supplied couplings to extend pipes. Airflow
restriction will occur.
Figure 50. Concentric Vent and Combustion Air Vertical
Termination
