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Installation & Operation Manual
5 Vertical direct venting
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 vent pipe and 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. 4-11, page 26).
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 7 inch diameter for #CVK3007
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.’s 4-7 and 4-8, page 25).
b. Cement rain cap to the smaller diameter kit pipe (see
FIG.’s 4-7 and 4-8, page 25).
Figure 5-4 Concentric Vertical Termination
NOTICE
ƽ WARNING
Figure 5-5 Do Not Install U-Bend to Rain Cap