Weil-McLain 550 MBH Nstallation And Operation Manual page 28

®
SlimFit Series 3
Direct Exhaust
Termination and fittings
1. Prepare the vent termination coupling (Figure 15) by
inserting a bird screen. Bird screens are not sup-
plied with the SlimFit boiler. Purchase separately
from Weil-McLain.
2. The vent piping must terminate in a coupling as shown
in Figure 15.
3. Maintain the required dimensions of the finished ter-
mination piping as shown in Figure 15.
4. Do not extend exposed vent pipe outside of building
more than shown in Figure 15. Condensate could freeze
and block vent pipe.
Multiple vent terminations
When terminating multiple SlimFit boilers, terminate
each vent connection as described in this section. Space
terminations as required for best installation practices and
required maintenance.
Complete termination preparation
Install vent terminations before proceeding. See previous
pages for instructions.
Installing direct exhaust vent piping
1. For reference in the following see:
a. Vertical terminations: see Figure 14, page 27.
2. 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.
a. You must install appropriate pipe reducers, where
required, at the boiler vent connection.
3. Cut pipe to required lengths.
4. Deburr inside and outside of pipe ends.
5. Chamfer outside of each pipe end to ensure even cement
distribution when joining.
6. Clean all pipe ends and fittings. Dry thoroughly.
7. Dry assemble entire vent or air piping to ensure proper
fit before assembling any joint.
8. For each PVC/CPVC joint:
a. Handle fittings and pipes carefully to prevent con-
tamination of surfaces.
b. For PVC/CPVC apply primer liberally to both joint
surfaces — pipe end and fitting socket.
c. While primer is still damp, lightly apply approved
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.
28
COMMERCIAL CONDENSING GAS
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FIRED WATER BOILER
DIRECT EXHAUST — Vertical termination
e. With cement still wet, insert pipe into fitting, twisting ¼
turn. Make sure pipe is fully inserted.
f. Wipe excess cement from joint. Check joint to be sure a
smooth bead of cement shows around the entire joint.
9. For polypropylene applications follow manufacturer's instruc-
tions for preparation and assembly.
10. Install pipe supports as shown on Figure 14, page 27.
11. Slope vent and air piping continuously toward boiler, with at
least 1/4 inch drop per foot of run. Do not allow sags at any
point.
12. Maintain minimum clearance of ³⁄₁₆ inch between vent pipe
and any combustible wall or material.
13. Seal wall or floor penetration openings following local code
requirements.
Boiler Manual
(continued)
Part number 550-100-168/0516