Weil-McLain WM97+70 Manual page 34

WM97+ -
gas fired water boiler
DIRECT VENT —
2. Place roof penetrations to obtain minimum of 12 inches between
centers of adjacent vent pipe of another boiler for U. S. installations
(see Figure 34, page 34).
3. The air inlet of a WM97+ boiler is part of a direct vent connection.
It is not classified as a forced air intake with regard to spacing from
adjacent boiler vents.
Prepare roof penetrations
1. Roof penetration hole:
a. Cut a clearance hole to clear the termination outside diameter
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. Provide flashing and sealing boots sized for the concentric termi-
nation outside diameter.
Mount concentric termination
1. Mount the termination as shown in Figure 35.
2. Support the concentric vent/air termination at the roof penetration
as shown in Figure 35 or per concentric kit instructions.
• The supports/bracing used must support the termination
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 substantial property damage.
When inserting the partially-assembled termination
kit through the roof penetration, wrap plastic or other
protection over the end of the exposed assembly to pre-
vent 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 problem. 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 emis-
sions.
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.
3. 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 Fig-
ure 36, page 35, or per kit instructions for polypropylene kits.
b. Cement the rain cap in place.
– 34 –
— Boiler Manual
Vertical concentric
See notices on previous page.
(continued)
Vertical termination — 3" PVC concentric
Figure 34
— single or multiple boilers
3" PVC concentric termination supports
Figure 35
Part number 550-142-085/0712