Weil-McLain Aqua Balance WMB-155 Manual page 30

W
TM
AquaBalance
13 DIRECT VENT — Vertical concentric
Prepare roof penetrations
1. Roof penetration hole:
a. Cut a clearance hole to clear the termination outside di-
ameter as prescribed in the kit instructions.
b. Insert a galvanized metal thimble in the vent pipe hole.
2. Follow all local codes for isolation of vent pipe when passing
through floors, ceilings and roofs.
3. For Canadian installations, provide clearances required by
CSA B149.1 or B149.2 Installation Code and a ULC S636
compliant vent kit.
4. Provide flashing and sealing boots sized for the concentric
termination outside diameter.
Mount concentric termination
1. Assemble the vent termination as described for concentric
terminations, on page 31.
2. Mount the termination as shown in Figure 35.
3. Support the concentric vent/air termination at the roof pene-
tration as shown in Figure 35 or per concentric kit instructions.
• The supports/bracing used must support the termina-
tion assembly to prevent vertical slippage or sideways
movement.
• The clamps used on the outside of the termination pipe
must not cut into the pipe or contain sharp edges that
could cause a crack to form.
The vent and air piping must be securely supported,
and must not rest its weight on the boiler fittings.
DO NOT drill or screw into either the vent pipe or
air pipe. Failure to properly support the vent and air
piping could result in vent piping damage, resulting
in possible severe personal injury, death or substan-
tial property damage.
When inserting the partially-assembled termina-
tion kit through the roof penetration, wrap plastic
or other protection over the end of the exposed
assembly to prevent debris from entering the pipes.
If the air passages become blocked, the boiler will
not operate. Once the rain cap has been cemented
to the assembly, there is no way to correct the prob-
lem. The assembly would have to be replaced if it
were cut to be removed and cleaned. Altering the
assembly in any way could result in severe personal
injury or death due to toxic flue product emissions.
If using AL29-4C stainless vent pipe, use the vent
pipe manufacturer's PVC adapter if connecting to
a PVC concentric vent attachment.
Do not connect any other appliance to the vent pipe
or multiple boilers to a common vent pipe.
4. After the assembly has been positioned in the roof opening and
all supports have been attached, install a bird screen (purchased
separately if not included with the kit) and rain cap as follows:
a. Place the bird screen on the end of the inner pipe as in
Figure 36, page 31, or per kit instructions for polypro-
pylene kits.
b. Cement the rain cap in place.
30
M -
ALL OUNT GAS FIRED WATER BOILER
See notices on previous page.
—
Boiler Manual
(continued)
Figure 34
Vertical termination — 3" PVC concentric —
single or multiple boilers
Figure 35
3" PVC concentric termination supports
Part number 550-100-305/0118