Vent And Air Piping And Boiler Connections - Weil-McLain Evergreen 220 User Manual

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Vent and air piping and boiler connections

Follow termination instructions
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 21, page 19.
Installing vent and air piping
For polypropylene applications, comply with any ad-
ditional requirements in the vent system manufacturer's
instructions. Provide 4" PVC-to-PP transition pieces at
the boiler vent and air connections. PP adapter must have
smooth, straight section of pipe to insert in to the boiler
vent and air connections and must fit and seal tightly. PP
adapters with their own seal which would interfere with
the internal seal of the boiler vent or air connections must
not be used. Refer to page 115 for a list of compliant adapt-
ers. Install a locking collar at every joint.
For AL29-4C vent pipe applications, comply with any ad-
ditional requirements in the vent system manufacturer's
instructions. Provide a 4" PVC transition piece at the
boiler vent connection. Air piping must be PVC or CPVC.
Connect to the boiler air piping only with 4" PVC (use a
transition piece for 3" air pipe). Provide 4" PVC connec-
tions at the termination if using the W-M termination
plate. Provide 3" or 4" 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 43 for attaching vent (and air) pipes at the boiler. Con-
nections must be 4" PVC or CPVC only — use transitions if needed
to adapt to other material or size (3"). When transitioning to 3", use
tapered reducer.
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 ³⁄₁₆ inch between vent pipe and
any combustible wall or material.
6. Seal wall or floor penetration openings following local code require-
ments.
7. Assembling PVC or CPVC: (
facturer'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 dis-
tribution 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.
– 36 –
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FIRED WATER BOILER
— follow pipe manu-
— Boiler Manual
Boiler vent and air connections
4-inch PVC or CPVC. This is required for different
materials or if using 3-inch pipe.
1. Use ONLY 4" 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 3 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 3 inch mark is reached.
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.
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.
When transitioning to 4-inch to 3-inch, use
tapered reducer with 4" nipple (6" Length or
greater). Do NOT use 4-inch to 3-inch bushing.
Bushing will NOT seal in boiler adapter.
— Use adapters if using other than
— DO NOT
use short radius elbows for vent or air pip-
ing. Boiler performance could be affected.
Part number 550-100-131/0715