Part number 550-142-058/0811
21
WM97+
gas
-
fired
water
boiler
—
Boiler Manual
DIRECT VENT —
Sidewall with W-M vent/air plate
Allowable vent/air pipe materials &
lengths
Use only the vent materials and kits listed
in Figure 15, page 17. Provide pipe adapt-
ers if specified.
1. Locate the termination such that the total air piping
and vent piping from the boiler to the termina-
tion will not exceed the maximum length given in
Figure 14, page 16.
For polypropylene applications, comply
with any additional requirements in the
vent system manufacturer’s instructions.
Provide 3” PVC transition pieces at the
boiler vent and air connections and at
the vent termination.
For AL29-4C vent pipe applications,
comply with any additional require-
ments in the vent system manufacturer’s
instructions. Provide 3” PVC transition
pieces at the boiler and at the vent and
air terminations. (The air pipe must be
PVC or CPVC.)
Determine termination location
1. The vent/air cap must be installed as shown in
Figure 21, page 22.
2. The termination must comply with clearances and
limitations shown in Figure 16, page 19.
3. Locate the termination so it is not likely to be dam-
aged by foreign objects, such as stones or balls, or
subject to buildup of leaves or sediment.
Multiple vent/air terminations or
termination adjacent to other appliance
terminations
1. When terminating multiple WM97+ boilers, ter-
minate each vent/air connection as described in
this manual.
All vent pipes and air inlets must ter-
minate at the same height to avoid pos-
sibility of severe personal injury, death or
substantial property damage.
2. Place wall penetrations to obtain minimum
clearance as shown in Figure 19, page 22 for U. S.
installations. For Canadian installations, provide
clearances required by CSA B149.1 or B149.2 Instal-
lation Code and a ULC S636 compliant vent kit..
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.
For terminations of other appliances,
provide at least the clearance shown Fig-
ure 19. The installation must also comply
with the manual for the other appliances.
Figure 18
INSTALLATION
— W-M sidewall vent/air plate
Step 1
Read and follow all instructions in this manual.
DO NOT proceed
with vent/air installation until you have read page 15
through page 20.
See notices at left.
Step 2
Install the boiler in a location that allows proper routing of all vent
and air piping to the selected sidewall location.
Step 3
Make sure the selected sidewall termination location complies with
Figure 16, page 19. (Multiple boiler sidewall plates must also comply
with Figure 19, page 22.)
Step 4
Use only the vent materials listed in Figure 15, page 17. Provide pipe
adapters where required.
Step 5
Vent piping and air piping lengths must not exceed the values shown
in Figure 14, page 16.
Step 6
Prepare the sidewall penetrations and secure the sidewall plates as
instructed in this section. See “Install Weil-McLain vent/air cap” on
page 22.
Step 7
The Weil-McLain plate termination must be installed before piping
from the boiler to the termination.
Step 8
Install vent and air piping between the boiler and the vent/air termina-
tion plate. Slope horizontal piping downward toward the boiler at least
1/4 inch per foot. See page 32 for general guidelines.
Step 9
Install pipe supports every 5 feet on both the horizontal and vertical
runs, or per vent pipe manufacturer’s instructions.
See notices at left.
Step 10
Install a hanger support within 6 inches of any upturn in the piping,
or per vent pipe manufacturer’s instructions.
See
notices at left.
USE SWEEP ELBOWS FOR ALL VENT AND AIR
PIPING
— DO NOT use short radius elbows for vent or
air piping. Boiler performance could be affected.
