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4 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. 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.
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).
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.
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).
Figure 4-4 Concentric Vertical Termination
NOTICE
ƽ WARNING
Figure 4-5 Do Not Install U-Bent to Rain Cap
Installation & Service Manual
TM