Part number 550-142-058/0811
23
WM97+
gas
-
fired
water
boiler
—
Boiler Manual
DIRECT VENT —
Sidewall with separate pipes
Allowable vent/air pipe materials &
lengths
Use only the vent materials and kits
listed in Figure 15, page 17. 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 14, page 16.
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.
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 22, page 23 and
Figure 24, page 24.
2. The terminations must comply with clearances
and limitations shown in Figure 16, page 19.
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 22. 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 pip-
ing, particularly when 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.
Figure 22
INSTALLATION SEQUENCE
— Separate pipes sidewall
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 Fig-
ure 16, page 19. (Multiple boiler sidewall plates must also comply with
Figure 23, page 24.)
Step 4
Use only the vent materials listed in Figure 15, page 17. Provide pipe adapt-
ers where required. Vent piping and air piping lengths must not exceed the
values shown in Figure 14, page 16.
Step 5
Prepare the sidewall penetrations and secure the sidewall plates as instructed
in this section. See “Prepare wall penetrations” on page 24.
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 32 for general guidelines.
See notices at left.
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.
See notices at left.
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.
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.