Lochinvar Shield SWR125 Installation & Service Manual page 35

4
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. 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 2C, on page 20 of this manual.
Vertical termination installation
1. See Section 4, Vertical Direct Venting - Determine
Location (where applicable).
Figure 4-4 Concentric Vertical Termination
Figure 4-5 Do Not Install U-Bent to Rain Cap
(continued)
2. Cut one (1) hole (5 inch diameter for #100140480
installations or 7 inch diameter for #100140484 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 3-7 and 3-8, page 30).
b. Cement rain cap to the smaller diameter kit pipe
(see FIG.'s 3-7 and 3-8, page 30).
c. Do not attach a U-Bent to the rain cap. Doing so could
cause recirculation (see FIG. 4-5).
Instead of cementing the smaller pipe to
NOTICE
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 31).
When using the alternate screw assembly
⚠ WARNING
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.
Installation & Service Manual
35