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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 transition pieces at the
boiler vent and air connections and at the
termination 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
1. The concentric termination kit must be installed
as shown in Figure 30, page 30.
2. The termination must comply with 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.
Multiple vent/air terminations
1. When terminating multiple WM97+ boilers, install
each concentric termination 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 clear-
ance as shown in Figure 29, page 30 for U. S. instal-
lations. For Canadian installations, provide clear-
ances required by CSA B149.1 or B149.2 Installation
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.
Part number 550-142-085/0712
— Boiler Manual
Sidewall concentric
Figure 28
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 sidewall termination location complies with
Figure 19, page 23. (Multiple boiler concentric terminations must also
comply with Figure 29, page 30.)
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 sidewall penetration — assemble the concentric termi-
nation kit and secure the cover plates as instructed in this section.
Provide the supports indicated and mount the termination assembly.
See "Install termination — concentric pipes" on page 30.
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 horizontal
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.
– 29 –
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