Vent And Air Intake Material; Pvc/Cpvc Pipe General Assembly Method; Vent And Air Intake Restrictions - Slant/Fin LYNX LX-85A Installation And Operating Instructions Manual

National Excelsior Company
www.excelsiorhvac.com
8
VENT AND AIR INTAKE MATERIALS
The vent and air intake system for direct or non-direct vent
installation must be 3" diameter PVC/CPVC schedule. 40 pipe,
or UL listed single wall 3" diameter AL29-4C* stainless steel
material. The following manufacturers' systems are approved
for use within a specified minimum and maximum equivalent
vent length in this manual.
Manufacturer
Type/System
Heat-Fab. Inc. Saf-T Vent
ProTech System, FasNSeal
Inc.
Flex-L
International, Inc.
Z-Flex, Inc.
N/A PVC pipe,
Schedule 40
N/A CPVC pipe,
Schedule 40
When joining the various components of the listed stainless
steel vent systems, the manufacturers' instructions should be
closely followed to insure proper sealing. Use sealant specified
by vent system manufacturer for sealing of pipe and fittings, if
required. When joining the PVC/CPVC pipe and fittings, follow
the instructions provided in this manual. All connections must be
liquid and pressure tight. DO NOT use galvanized flue pipe or
any plastic-type materials other than PVC/CPVC Schedule 40.
The integral adapters on the boiler are designed to accommo-
date either PVC/CPVC Schedule 40 pipe or the listed stainless
steel vent systems. These adapters have built-in sealing rings,
so no additional sealant is required. Make sure the pipes are
round and burr-free, and push down into the appropriate step
of the adapter, until snug. (See Figure 5). Apply liquid soap to
the outer end of the vent pipe and air intake pipe for easy
insertion.
Sealant
Not Required
EZ Seal
Not Required
StaR-34 GE-IS806
Z-Vent GE, RTV 106
PVC primer
and cement
CPVC primer
and cement
Subject to change without notice.

PVC/CPVC PIPE GENERAL ASSEMBLY METHOD

The following are the recommended methods for cutting,
cleaning and connecting PVC and CPVC pipe, for both the
vent and air intake piping system:
1. When laying out the piping system, work from the boiler
vent and air intake adapter to the point of outside
termination.
2. Cut the PVC/CPVC pipe to the required lengths, and
pre-assemble the entire system, before sealing.
Disassembly after sealing, to make any corrections, will not
be possible.
3. Once the pre-assembled PVC/CPVC pipe vent and air
intake system is verified to be of the proper length pipe and
fitting orientation, begin disassembling and preparing the
pipes and fittings for the sealing process. This can be done
section by section, or the complete vent and air intake
system can be disassembled. It is recommended to mark
the various parts, before complete disassembly, to
eliminate the possibility of errors during re-assembly.
4. De-burr the inside and outside of every PVC/CPVC pipe, to
ensure that they engage fully into the fittings, and flow is
not compromised. A small chamfer on the outside of each
pipe can particularly aid in the final assembly process.
5. Wipe or knock out any debris from inside the PVC or
CPVC pipe, which may have accumulated there from the
cutting process or storage. Debris can cause operational
problems with the boiler combustion components.
6. Thoroughly clean the outside ends of each pipe, and the
inside of each fitting. The surfaces must be dry for the
sealing agents to work properly. Handle the prepared pipe
lengths away from the cleaned ends, and handle the
cleaned fittings, from the outside, to avoid contamination.
7. Re-assembly of the PVC or CPVC pipe should be done in
sections, to avoid the primer and cement drying before the
parts are engaged.
8. For each joint, first apply a coat of primer to the outside
sealing surface of the pipe and the inside sealing surface of
each fitting. Use only the primer type that is specified for
either the PVC or CPVC pipe that is bing utilized.
9. Before the primer dries, apply a coat of cement over it. A
second coat of cement can be applied, if necessary, but
must be done quickly and in a manner that avoids
unnecessary build-up that would cause obstruction inside
the system. Use only the cement type that is specified for
either the PVC or CPVC pipe that is being utilized.
10. Before the cement dries, insert the pipe into the fitting. A
slight twisting motion while pushing the pipe into the fitting
will aid in distributing the cement evenly and ensuring the
parts fully engage.
11. Quickly wipe the excess cement from the outside areas of
the joint. Discard any rags used to avoid later getting the
cement on hands, clothes and equipment.

VENT AND AIR INTAKE RESTRICTIONS

1. Maximum allowed equivalent vent and air intake length for
all of the approved vent and air intake materials is 100 feet.
2. Equivalent of vent or air intake length is sum of the
straight pipe lengths and equivalent length of elbows as
shown in the table on page 9.