Vent And Air Piping And Boiler Connections - Weil-McLain WM97+ Manual

WM97+ -
gas fired water boiler

Vent and air piping and boiler connections

Follow termination instructions
1. Read and follow all instructions for the termination type used
before proceeding with this page. Follow all instructions provided
by vent pipe manufacturer.
Use only materials from the manufacturers listed in
Figure 15, page 17.
Installing vent and air piping
For polypropylene applications, comply with any addi-
tional requirements in the vent system manufacturer's
instructions. Provide 3" PVC transition pieces at the
boiler vent and air connections, and also at the termina-
tion when using the W-M termination plate. Provide 2"
or 3" PVC transitions at the termination if using a PVC
concentric vent kit.
For AL29-4C vent pipe applications, comply with any
additional requirements in the vent system manufac-
turer's instructions. Provide a 3" PVC transition piece
at the boiler vent connection. Air piping must be PVC
or CPVC. Connect to the boiler air piping only with
3" PVC (use a transition piece for 2" air pipe). Provide
3" PVC connections at the termination when using the
W-M termination plate. Provide 2" or 3" PVC transitions
at the termination if using a PVC concentric vent kit.
1. Work from the boiler to vent or air termination. Do not exceed the
lengths given in the previous pages for either the air or vent piping.
2. See Figure 34 for attaching vent (and air) pipes at the boiler. Con-
nections must be 3" PVC or CPVC only — use transitions when
needed to adapt to other material or size (2").
3. Cut pipe to required lengths.
4. Dry assemble entire vent or air piping to ensure proper fit before
assembling any joint.
5. Maintain minimum clearance of C\zn inch between vent pipe and
any combustible wall or material.
6. Seal wall or floor penetration openings following local code re-
quirements.
7. Assembling PVC or CPVC: (
manufacturer's instructions for preparation and assembly)
a. Deburr inside and outside of pipe ends.
b. Chamfer outside of each pipe end to ensure even cement
distribution when joining.
c. Clean all pipe ends and fittings. Dry thoroughly.
d. For each joint:
• Handle fittings and pipes carefully to prevent contamina-
tion of surfaces.
• Apply primer liberally to both joint surfaces — pipe end
and fitting socket.
• While primer is still damp, lightly apply approved cement
to both surfaces in a uniform coating.
• Apply a second coat to both surfaces. Avoid using too much
cement on sockets to prevent cement buildup inside.
• With cement still wet, insert pipe into fitting, twisting ¼
turn. Make sure pipe is fully inserted.
• Wipe excess cement from joint. Check joint to be sure a
smooth bead of cement shows around the entire joint.
32
— Boiler Manual
Figure 34
1. Use ONLY 3" PVC or CPVC pipe at boiler connections.
2. Clean and deburr inside and outside of both ends of air
and vent pipes. Chamfer boiler end of vent pipe for ease of
insertion.
3. Inspect vent or air adapter (above) — verify no obstructions
or foreign objects inside.
4. Loosen clamp screw.
5. Measure 3½ inches from end of pipe and make a mark with
felt-tip pen.
6. Loosen adapter clamp screw.
7. Apply small amount of silicon grease to end of pipe to ease
— follow pipe
insertion.
8. Insert pipe into adapter.
9. Slide pipe down until the 3½-inch mark is reached.
10. Secure vent or air pipe by tightening the adapter clamp se-
curely. Do not overtighten.
11. The seal is accomplished with the internal gasket. The clamp
is only to hold the pipe in place.
Boiler vent and air connections
ADAPTERS
— Use adapters when using other than
3-inch PVC or CPVC. This is required for different
materials or when using 2-inch pipe.
The vent pipe end must be smooth and chamfered
to prevent possible damage to sealing gasket in vent
pipe adapter.
Do not apply excessive force or bend the adapter
or flue/air pipe when inserting. The adapter or seal
could be damaged. If any portion of the vent or air
system is damaged, it must be replaced.
USE SWEEP ELBOWS FOR ALL
VENT AND AIR PIPING — DO NOT
use short radius elbows for vent or air pip-
ing. Boiler performance could be affected.
Part number 550-142-058/0811