Weil-McLain 550 MBH Nstallation And Operation Manual page 45

®
SlimFit Series 3
Install vent/air piping — from termination to boiler
Complete termination preparation
1. Install vent and air terminations before proceeding. See previous
pages for instructions.
Pipe joint preparation and sealing
1. Dry assemble entire vent or air piping to ensure proper fit before
assembling any joint. Mark pipe with felt-tip pen to ensure full
insertion when completing each joint.
2. Cut pipe to required lengths.
3. Deburr inside and outside of pipe ends.
4. Chamfer outside of each pipe end to ensure even cement distribu-
tion when joining.
5. Clean all pipe ends and fittings. Dry thoroughly.
6. 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 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.
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.
Use cement sparingly. Excessive cement can cause block-
age of the condensate opening.
1. Install the required stainless vent adapter at boiler vent connection,
following instructions supplied with the adapter.
2. Follow vent pipe manufacturer's instructions for preparing and
sealing joints.
Installing vent and air piping
1. For reference in the following see:
a. DIRECT EXHAUST — Sidewall terminations: see Figure 17,
page 31.
b. DIRECT EXHAUST — Vertical terminations: see Figure 25,
page 35.
c. DIRECT VENT — Sidewall terminations: see Figure 28,
page 38.
d. DIRECT VENT — Vertical terminations: see Figure 36,
page 42.
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. As shown in the maximum length tables, the SF-550 must be
installed with only 6-inch vent and air piping.
b. As shown in the maximum length tables, the SF-750 may be
installed with either 6-inch or 8-inch vent and air piping.
c. SF-750 only — Install appropriate pipe reducers, when re-
quired, at both the boiler vent and air connections. Install
directly at the boiler, with reducer in the vertical orientation.
3. See Figure 40 for attaching vent and air pipes at the boiler.
Part number 550-100-168/0516
COMMERCIAL CONDENSING GAS
—
-
FIRED WATER BOILER
Boiler vent and air connections
Inserting/securing vent or air
pipe into boiler connectors
adapter at each boiler fitting where stain-
less steel pipe will be connected.
1. Clean and chamfer insertion end of pipe. Deburr
inside of insertion end.
2. Inspect boiler vent or air adapter (above) — verify
no obstructions or foreign objects inside.
3. Measure 3½ inches from end of pipe and make
a mark with felt-tip pen before assembling joint.
4. Prepare and assemble joints per instructions at left.
Do not apply excessive force or bend the
adapter or flue/air pipe when inserting.
The adapter could be damaged.
4. Install pipe supports as shown in Figure 28, page 38 or
Figure 36, page 42.
5. Slope vent and air piping continuously toward boiler,
with at least ¼ inch drop per foot of run. Do not allow
sags at any point.
6. Maintain minimum clearance of ³⁄₁₆ inch between vent
pipe and any combustible wall or material.
7. Seal wall or floor penetration openings following local
code requirements.
Boiler Manual
— Install required
45