Vent And Air Piping And Boiler Connections - Weil-McLain Series 2 Manual

® S
ERIES

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 23, page 24 .
Installing vent and air piping
For poly propylene applications, comply with
any additional requirements in the vent system
manufacturer's instructions. Provide 3" PVC transition
pieces at the boiler vent and air connections, and also
at the termination if using the W-M termination plate.
Provide 2" or 3" PVC transitions at the termination if
using a PVC concentric vent kit. Install a locking collar
at every joint.
For AL29-4C vent pipe applications, comply with
any additional requirements in the vent system
manufacturer'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 if 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 45 for attaching vent (and air) pipes at the boiler.
Connections must be 3" PVC or CPVC only — use transitions if
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 fi t before
assembling any joint.
5. Maintain minimum clearance of ³⁄₁₆ inch between vent pipe and
any combustible wall or material.
6. Seal wall or floor penetration openings following local code
requirements.
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 fi ttings. Dry thoroughly.
d. For each joint:
• Handle fi ttings and pipes carefully to prevent contamination
of surfaces.
• Apply primer liberally to both joint surfaces — pipe end
and fi tting 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 fi tting, 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.
Part number 550-142-190/1218
2
-
G
AS FIRED WATER BOILER
— follow pipe
— Boiler Manual
Figure 45
Boiler vent and air connections
— Use adapters if using other than
ADAPTERS
3-inch PVC or CPVC. This is required for different
materials or if using 2-inch pipe.
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.
The vent pipe end must be smooth and chamfered
to prevent possible damage to sealing gasket in vent
pipe adapter.
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
insertion.
8. Insert pipe into adapter.
9. Slide pipe down until the 3½-inch mark is reached.
Do not apply excessive force or bend the adapter
or fl ue/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.
10. Secure vent or air pipe by tightening the adapter clamp
securely. Do not overtighten.
11. The seal is accomplished with the internal gasket. The clamp
is only to hold the pipe in place.
USE SWEEP ELBOWS FOR ALL
VENT AND AIR PIPING — DO NOT
use short radius elbows for vent or air
piping. Boiler performance could be
affected.
41