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5 Vertical 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. 5-4.
Field supplied pipe and fittings are required to complete the
installation.
The required combustion air and vent pipe fittings are
listed in Table 3A, on page 17 of this manual.
Vertical termination installation
1. See Section 5, Vertical Direct Venting - Determine
Location (where applicable).
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 25).
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.
2. Cut one (1) hole (5 inch diameter for #CVK3003
installations or 4 inch diameter for #CVK3008 installations)
into the structure to install the termination kit.
3. 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. 4-7, page 24).
b. Cement rain cap to the smaller diameter kit pipe (see
FIG. 4-7, page 24).
Figure 5-4 Concentric Vertical Termination
NOTICE
ƽ WARNING
Figure 5-5 Do Not Install U-Bend to Rain Cap
29
Installation & Operation Manual