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Installation & Operation Manual
25
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 14 of this manual.
Vertical termination installation
1. Determine the best location for the termination kit (see
FIG. 5-4).
2. The total length of piping for vent or air must not
exceed the limits given in the General Venting section on
page 15 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. 4-9, page 21).
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. You must consider the surroundings when terminating the
vent and air:
a. Position the vent termination where vapors will not
damage nearby shrubs, plants, or air conditioning
equipment or be objectionable.
b. The flue products will form a noticeable plume as
they condense in cold air. Avoid areas where the
plume could obstruct window views.
c. Prevailing winds could cause freezing of condensate
and water/ice buildup where flue products impinge
on building surfaces or plants.
d. Avoid possibility of accidental contact of flue
products with people or pets.
e. Do not locate the terminations where wind eddies
could affect performance or cause recirculation,
such as inside building corners, near adjacent
buildings or surfaces, window wells, stairwells,
alcoves, courtyards, or other recessed areas.
f. Do not terminate above any door or window.
Condensate can freeze, causing ice formations.
g. Locate or guard vent to prevent condensate damage
to exterior finishes.
h. Do not attach a U-Bent to the rain cap. Doing so could
cause recirculation (see FIG. 5-5).
4. 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.
5. 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 20).
b. Cement rain cap to the smaller diameter kit pipe (see
FIG. 4-7, page 20).
Figure 5-4 Concentric Vertical Termination
NOTICE
ƽ WARNING
Figure 5-5 Do Not Install U-Bent to Rain Cap