Weil-McLain Series 2 Manual page 34

® S
ERIES
DIRECT VENT —
Allowable vent/air pipe materials &
lengths
Use only the vent materials and kits
listed in Figure 23, page 24 . Provide pipe
adapters if specifi ed.
1. Locate the terminations such that the total air
piping and vent piping from the boiler to the
termination will not exceed the maximum length
given in Figure 22, page 23 .
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,
comply with any additional requirements
in the vent system manufacturer's
instructions. 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 36 .
2. The terminations must comply with clearances and
limitations shown in Figure 24, page 26 .
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 ECO boilers, terminate
each vent/air connection as described in this
manual.
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
clearance of 12 inches between edge of air intake
elbow and adjacent vent pipe of another boiler
for U. S. installations (see Figure 37, page 35 ). 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 ECO boiler is part of a direct vent
connection. It is not classifi ed as a forced air intake
with regard to spacing from adjacent boiler vents.
34
2
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G
AS FIRED WATER BOILER
Vertical with separate pipes
— Boiler Manual
Figure 36
Separate pipes vertical termination
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 fi tted with bird screens
Step 1 Read and follow all instructions in this manual. DO NOT proceed
with vent/air installation until you have read page 22
through page 27 .
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 24, page 26 . (Multiple boiler terminations must also comply
with Figure 37, page 35 .)
Step 4 Use only the vent materials listed in Figure 23, page 24 . Provide pipe
adapters where required. Vent piping and air piping lengths must not
exceed the values shown in Figure 22, page 23 .
Step 5 Prepare the vertical penetrations and secure penetration components
as instructed in this section. See "Prepare roof penetrations" on page 35
and "Termination and fi ttings" on page 35 .
Step 6 The air piping must terminate in a 180-degree return bend or down-
turned elbow as shown above. The vent piping must terminate in a
coupling pointed upward as shown above.
Step 7 Install vent and air piping between the boiler and the vertical
terminations. 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 41 for general guidelines. Also
comply with vent pipe manufacturer's instructions.
See notices at left.
Step 8 Insert the vent and air piping through the vertical penetrations and
secure the termination fi ttings.
Step 9 Maintain clearances shown above. Vent and air terminations must be
fi tted 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.
Part number 550-142-190/1218