Lochinvar WH 55-399 Vertical direct venting continued, 6 Concentric Vent Roof Installation

Installation & Operation Manual

5 Vertical direct venting (continued)

NOTICE	Instead of cementing the smaller pipe to
	the rain cap, a field supplied stainless steel
	screw may be used to secure the two (2)
	components together when field disassembly
	is desired for cleaning (see FIG. 4-9, page

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 30.

27).

NOTICE

If assembly is too short to meet height requirement, the two (2) pipes supplied

￿WARNING

When using the alternate screw assembly method, drill a clearance hole in the rain cap and a pilot hole in the vent pipe for the screw size being used. Failure to drill adequate holes may cause cracking of PVC components, allowing combustion products to be recirculated. Failure to follow this warning could result in personal injury or death.

CAUTION

in the kit may be replaced by using the same diameter, field supplied SDR-26 PVC (D2241) pipe. Add standard schedule 40 PVC pipe for #CVK3007 Do not extend dimension D more than 60 inches (see FIG. 4-9 and FIG. 4-10, page 27).

DO NOT use field-supplied couplings to extend pipes. Airflow restriction will occur.

￿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.

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 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.

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

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	31
24” ABOVE ROOF.