Lochinvar SNA285-125 4Vertical direct venting continued, Installation & Service Manual, Notice

TM

Installation & Service Manual

4Vertical direct venting (continued)

Vertical termination – optional concentric vent

Description and usage

Lochinvar offers an optional concentric combustion air and vent pipe termination kit. Both combustion air and vent pipes must attach to the termination kit. The termination kit must terminate outside the structure and must be installed as shown in FIG. 4-4.

Field supplied pipe and fittings are required to complete the installation.

The required combustion air and vent pipe fittings are listed in Table 2A, on page 15 of this manual.

Vertical termination installation

1.Determine the best location for the termination kit (see FIG. 4-4).

2.The total length of piping for vent or air must not exceed the limits given in the General Venting section on page 17 of this manual.

Figure 4-4Concentric Vertical Termination

3.Cut one (1) hole (5 inch diameter for #CVK3003 installations or 7 inch diameter for #CVK3007 installations) into the structure to install the termination kit.

4.Partially assemble the concentric vent termination kit. Clean and cement following the cleaning procedures in these instructions.

a.Cement the Y concentric fitting to the larger diameter kit pipe (see FIG.’s 3-7 and 3-8, page 22).

b.Cement rain cap to the smaller diameter kit pipe (see FIG.’s 3-7 and 3-8, page 22).

c.Do not attach a U-Bent to the rain cap. Doing so could cause recirculation (see FIG. 4-5).

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. 3-11,
	page 23).

￿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.

Figure 4-5Do Not Install U-Bent to Rain Cap

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