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WM97+
-
gas
fired water boiler
DIRECT VENT —
Allowable vent/air pipe materials &
lengths
1. The concentric termination kit must be purchased
separately.
Use only the vent materials and kits listed
in Figure 18, page 21. Provide pipe adapt-
ers if specified.
2. 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 17, page 20.
3. This termination requires a 45-degree elbow that
is not supplied with the termination kit. The
maximum vent/air pipe lengths include allowance
for this elbow.
For polypropylene applications, comply
with any additional requirements in the
vent system manufacturer's instructions.
Provide 3" PVC transitions at the boiler
vent and air connections and at the termi-
nation if using a 3" PVC concentric vent
kit. Install a locking collar at every joint.
For AL29-4C vent pipe applications, com-
ply with any additional requirements in
the vent system manufacturer's instruc-
tions. Provide a 3" PVC transition at the
boiler vent connection. Air pipe must be
PVC or CPVC. Provide a 3" PVC transi-
tion at the boiler air connection if using
2" air pipe. Provide transition pieces to
PVC at the vent and air pipe termination
connections.
Determine termination location
Locate the concentric vent/air termination using the
following guidelines:
1. The concentric vent/air assembly must terminate
as shown in these instructions.
2. The termination must comply with the clearances
and limitations shown in Figure 19, page 23.
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.
4. For Canadian installations, follow requirements
of CSA B149.1 or B149.2 Installation Code and a
ULC S636 compliant vent kit.
Multiple vent/air terminations
1. When terminating multiple WM97+ boilers, install
the concentric vent/air termination assemblies as
described in this manual.
All vent outlets must terminate at the
same height to avoid possibility of severe
personal injury, death or substantial
property damage.
Part number 550-142-085/0712
— Boiler Manual
Vertical concentric
Figure 33
INSTALLATION SEQUENCE
Step 1 Read and follow all instructions in this manual. DO NOT proceed
with vent/air installation until you have read page 19
through page 24.
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 vertical termination location complies with
Figure 19, page 23. (Multiple boiler concentric terminations must also
comply with Figure 34, page 34.)
Step 4 Use only the vent materials listed in Figure 18, page 21. Provide pipe
adapters where required.
Step 5 Vent piping and air piping lengths must not exceed the values shown
in Figure 17, page 20.
Step 6 The concentric termination must be assembled and installed before
piping from the boiler to the termination.
Step 7 Prepare the vertical penetration(s) — assemble the concentric termina-
tion kit and secure the penetration components as instructed in this
section. Provide the supports indicated and mount the termination
assembly. See "Prepare roof penetrations" on page 34 and "Mount con-
centric termination" on page 34.
Step 8 Install vent and air piping between the boiler and the concentric vent/
air termination. Slope horizontal piping downward toward the boiler
at least 1/4 inch per foot. See page 36 for general guidelines.
Step 9 Install pipe supports every 5 feet on both the horizontal and vertical
runs.
Step 10 Install a hanger support within 6 inches of any upturn in the piping.
— Concentric vertical
See notices at left.
See notices at left.
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.
See notices at left.
– 33 –
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