Lochinvar 51 operation manual Multiventing vertical terminations, Minimum Combustion AIR Typical

Installation & Operation Manual

5Vertical direct venting

Vertical termination – optional concentric vent

￿WARNING

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.

CAUTION	DO NOT use field-supplied couplings 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.
7.	Cement the appliance combustion air and vent pipes to the
	concentric vent termination assembly. See FIG. 5-6 for

4.Install the Y concentric fitting pipe assembly through the structure’s hole and field supplied roof boot/flashing.

NOTICE	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 FIG. 5-6 using field supplied metal strapping or equivalent support material.

Figure 5-6Concentric Vent Roof Installation

NOTICE	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 29.
	If assembly is too short to meet height
NOTICE
	requirement, the two (2) pipes supplied in
	the kit may be replaced by using the same
	diameter, field supplied SDR-26 PVC
	(D2241) pipe. Do not extend dimension D
	more than 60 inches (see FIG. 4-8, page 25).

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. 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. It is important that vent terminations be made as shown to avoid recirculation of flue gases.

Figure 5-7Concentric Vent and Combustion Air Vertical Termination

12”

MINIMUM

COMBUSTION

AIR (TYPICAL)

12” (18” FOR CANADA) MINIMUM CLEARANCE ABOVE HIGHEST ANTICIPATED SNOW LEVEL. MAXIMUM OF 24” ABOVE ROOF.

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