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WM97+
-
gas
fired water boiler
DIRECT VENT —
Allowable vent/air pipe materials &
lengths
Use only the vent materials and kits
listed in Figure 18, page 21. Provide
pipe adapters if specified.
1. Locate the termination such that the total air
piping and vent piping from the boiler to the
termination will not exceed the maximum
length given in Figure 17, page 20.
For polypropylene applications,
comply with any additional require-
ments in the vent system manufac-
turer's instructions. Provide 3" PVC
transition pieces at the boiler vent
and air connections. Install a locking
collar at every joint.
For AL29-4C vent pipe applica-
tions, comply with any additional
requirements in the vent system
manufacturer's instructions. Pro-
vide a 3" PVC transition piece at the
boiler vent connection. The air pip-
ing must be PVC or CPVC. Provide a
3" PVC transition piece at the boiler
air connection if using 2" air piping.
Determine termination location
1. The air and vent terminations must be in-
stalled as shown in Figure 25, page 27 and
Figure 27, page 28.
2. The terminations must comply with clearances
and limitations shown in Figure 19, page 23.
3. Locate the terminations so they are not likely
to be damaged by foreign objects, such as
stones or balls, or subject to buildup of leaves
or sediment.
Do not exceed the maximum lengths
of the outside vent piping shown in
Figure 25. Excessive length exposed
to the outside could cause freezing
of condensate in the vent pipe, re-
sulting in potential boiler shutdown.
In extremely cold climates, install
an insulated chase around the vent
piping, particularly if using longer
lengths. The chase must allow for
inspection of the vent pipe, and
insulation must be protected from
water.
Multiple vent/air terminations
1. When terminating multiple WM97+ boil-
ers, terminate each vent/air connection as
described in this manual.
Part number 550-142-120/0113
— Boiler Manual
Sidewall with separate pipes
Figure 25
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 Fig-
ure 19, page 23. (Multiple boiler sidewall plates must also comply with
Figure 26, page 28.)
Step 4 Use only the vent materials listed in Figure 18, page 21. Provide pipe adapt-
ers where required. Vent piping and air piping lengths must not exceed the
values shown in Figure 17, page 20.
Step 5 Prepare the sidewall penetrations and secure the sidewall plates as instructed
in this section. See "Prepare wall penetrations" on page 28.
See notices at left.
Step 6 The air piping must terminate in a down-turned elbow as shown above.
The vent piping must terminate in an elbow pointed outward or away
from the air inlet as shown above. See illustration above.
Step 7 Install vent and air piping between the boiler and the sidewall openings.
Slope horizontal piping downward toward the boiler at least 1/4 inch per
foot. See page 36 for general guidelines.
Step 8 Install pipe supports every 5 feet on both the horizontal and vertical runs.
Install a hanger support within 6 inches of any upturn in the piping, or per
vent pipe manufacturer's instructions.
Step 9 Attach the vent termination exterior piping: Use either of the configura-
tions shown above, as needed to ensure clearance above grade or snow line.
Step 10 The vent and air pipes may run up as high as 4 feet with no enclosure.
The vent and air pipes must be secured with braces, and all clearances and
lengths must be maintained. Space braces no further than 24 inches apart.
Step 11 External venting greater than 4 feet requires an insulated enclosure around
the vent and air pipes. The vent and air terminations must exit through
the enclosure as shown in the illustration above, maintaining all required
clearances.
— Separate pipes sidewall
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.
See notices at left.
– 27 –
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