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Installation & Operation Manual
32
5 Vertical direct venting
Vertical termination – optional concentric vent: Models 399 - 600 Only
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 fittings are listed in
Table 3A, on page 18 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. 4-10, page 28).
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 (7 inch (178 mm) 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. 4-8, page 27).
b. Cement rain cap to the smaller diameter kit pipe (see
FIG. 4-8, page 27).
VENT
COMBUSTION
AIR
12" (305 MM) (18" (457 MM)
FOR CANADA) MINIMUM
CLEARANCE ABOVE HIGHEST
ANTICIPATED SNOW
LEVEL. MAXIMUM OF
24" (610 MM) ABOVE ROOF.
Figure 5-4 Concentric Vertical Termination
NOTICE
ƽ WARNING
Figure 5-5 Do Not Install U-Bent to Rain Cap