Part number 550-143-010/1021
47
GV90+
series
2
gas-fired water boiler – boiler manual
Figure 58
3” PVC concentric termination assembly — DO NOT
attach the rain cap until the termination has been
inserted through the roof or wall and all supports have
been installed.
Concentric termination assembly
(sidewall or vertical)
Assembling concentric termination
1. See Figure 58 for the details of the termination
assembly.
2. Prepare the bird screen (purchased separately if not
included with the kit). Cut the bird screen to size if
required. If the bird screen must be trimmed, cut
the bird screen to fit the outside diameter of the
PVC inner pipe supplied with the termination kit.
3. Partially assemble the vent termination kit in the
sequence shown in Figure 58.
DO NOT
install the rain cap and bird
screen until the assembly has been in-
serted through the roof (or sidewall)
and all supports have been installed.
Follow instructions to cover the end of
the assembly with plastic before inserting
through the roof penetration to prevent
debris from blocking the air passages.
4. Use the following procedures to prepare termina-
tion components and cement together.
5. Deburr inside and outside of pipe ends.
6. Chamfer outside of each pipe end to ensure even
cement distribution when joining.
7. Clean all pipe ends and fittings.
8. Dry thoroughly.
9. Dry assemble entire vent or air piping to ensure
proper fit before assembling any joint.
10. For each joint:
a. Handle fittings and pipes carefully to prevent
contamination of surfaces.
b. Apply primer liberally to both joint surfaces —
pipe end and fitting socket.
c. While primer is still damp, lightly apply ap-
proved cement to both surfaces in a uniform
coating.
d. Apply a second coat to both surfaces. Avoid
using too much cement on sockets to prevent
cement buildup inside.
e. With cement still wet, insert pipe into fitting,
twisting ¼ turn. Make sure pipe is fully inserted.
If necessary, you can shorten the lengths
of the inner and outer pipes for a shorter
finished assembly. But you must ensure
the pipes butt correctly at both ends. Fail-
ure to properly assemble the concentric
termination can result in flue gas recir-
culation, causing possible severe personal
injury or death.
