Table of Contents
Advertisement
8
PVC/CPVC PIPE GENERAL ASSEMBLY METHOD (Air
Intake Only)
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 being 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
30.48m (100 feet) for B-120A and 15.24m (50 feet) for
B-200A.
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 this page.
3. The vent termination is in addition to the allowed
equivalent lengths.
4. Minimum vent length is 610mm (2 feet) of straight pipe,
plus the one 90° elbow that is required.
5. Vent length restriction is for both direct and non-direct
vent installations.
Bobcat Models B-120A and B-200A
PVC OR CPVC
FITTING
APPLY A COAT OF THE
APPROPRIATE PRIMER,
THEN CEMENT TO THE FIRST 38mm
(1-1/2") OF THE INNER WALL OF THE
PVC OR CPVC FITTING AND OUTER
WALL OF THE PVC OR CPVC PIPE
Figure 6.
EXAMPLE: Boiler model B-120A is to be installed. The
combustion air is provided by air intake piping directly to
the boiler (direct-vent installation). The vent piping will be
Certified PVC or CPVC Venting and installation location will
require the use of 4 elbows for the vent to run the termination.
The air intake piping will be PVC, and also will require the use
of 4 elbows.
In this case, the maximum straight pipe vent length that can
be utilized with the 4 elbows would be: 30.5m - (4 x 1.52m) =
24.4m [100' - (4' x 5') = 80']. Since the air intake pipe also is
PVC and requires the use of 4 elbows, the maximum straight
pipe air intake length that can be utilized is also 24.4m (80
feet.)
If the air for combustion were taken from the boiler room
(non-direct vent installation), still the maximum straight vent
length would be 24.4m (80 feet.)
Equivalent Length of Various 90-Degree Elbows
Manufacturer
Type/System
Saf-T Standard
Heat-Fab Inc.
elbow
Saf-T, tight radius
Heat-Fab Inc.
elbow
ProTech System
FasNseal
Inc.
Flex-L International
StaR-34
Inc.
Certified PVC or
CPVC Venting
Various
System to
ULC S 636
PVC, CPVC
Various
Schedule 40 (air
intake only)
6. The B-120A and B-200A boilers are equipped with a built-
in condensation drain and trap. The trap must be filled
with water. DO NOT operate the boiler without filling the
trap with water to prevent flue gas discharge into space.
The drain must dispose of possibly large quantities of
condensate, which may require a neutralizing system.
Refer to the "Condensate Drainage" section of this
manual. No additional condensation drain and trap is
required on the vent piping system itself.
7. The horizontal vent pipe must be sloped upward from the
boiler at a pitch of at least 6mm (1/4") per 305mm (1 foot)
of run, so that the condensate from the vent system runs
to the boiler vent adapter pipe, then out the built-in
condensation drain and trap.
PVC OR CPVC
PIPE
Equivalent Length - m (ft)
0.91 (3)
1.83 (6)
1.83 (6)
GE-IS806
Consult Manufacturers
Instructions
Hide quick links:
Advertisement
Table of Contents
