Direct Vent - Vertical With Separate Pipes - Weil-McLain WM97+70 Manual

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 adapt-
ers if specified.
1. Locate the terminations such that the total air pip-
ing and vent piping from the boiler to the termina-
tion will not exceed the maximum length given in
Figure 17, page 20.
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. 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 piece
at the boiler vent connection. The air
piping 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 installed as
shown in Figure 31.
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.
Multiple vent/air terminations
1. When terminating multiple WM97+ boilers, ter-
minate each vent/air connection as described in
this section.
Terminate all vent pipes at the same
height and all air pipes at the same height
to avoid possibility of severe personal
injury, death or substantial property
damage.
2. Place roof penetrations to obtain minimum clear-
ance of 12 inches between edge of air intake elbow
and adjacent vent pipe of another boiler for U. S.
installations (see Figure 32, page 32). For Canadian
installations, provide clearances 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
Vertical with separate pipes
Figure 31
Terminate vent and air pipes such that:
a AIR INTAKE IS AT LEAST 12 inches below vent outlet
b AIR INTAKE IS NO FURTHER than 12 inches away center to center
c AIR INTAKE IS AT LEAST 12 inches above roof or snow line
d Vent and air terminations are fitted with bird screens
Step 1 Read and follow all instructions in this manual. DO NOT proceed
Step 2 Install the boiler in a location that allows proper routing of all vent
Step 3 Make sure the selected vertical termination location complies with
Step 4 Use only the vent materials listed in Figure 18, page 21. Provide pipe
(Figure 32)
Step 5 Prepare the vertical penetrations and secure penetration components
Step 6 The air piping must terminate in a 180-degree return bend or down-
Step 7 Install vent and air piping between the boiler and the vertical termina-
Step 8 Insert the vent and air piping through the vertical penetrations and
Step 9 Maintain clearances shown above. Vent and air terminations must be
Separate pipes vertical termination
with vent/air installation until you have read page 19
through page 24.
and air piping to the selected sidewall location.
Figure 19, page 23. (Multiple boiler terminations must also comply
with Figure 32, page 32.)
adapters where required. Vent piping and air piping lengths must not
exceed the values shown in Figure 17, page 20.
as instructed in this section. See "Prepare roof penetrations" on page 32
and "Termination and fittings" on page 32.
turned elbow as shown above. The vent piping must terminate in a
coupling pointed upward as shown above.
tions. Slope horizontal piping downward toward the boiler at least 1/4
inch per foot. 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. See page 36 for general guidelines. Also comply with vent
pipe manufacturer's instructions.
secure the termination fittings.
fitted with a bird screen as shown.
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.
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