Weil-McLain Series 2 Manual page 38

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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
specified.
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-to-PP transition pieces at the boiler
vent and air connections. PP adapter must
have smooth, straight section of pipe to insert
in to the boiler vent and air connections
and must fit and seal tightly. PP adapters
with their own seal which would interfere
with the internal seal of the boiler vent or
air connections must not be used. Refer to
page 115 for a list of compliant adapters.
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.
2. For 3" to 2" transitions, must use appropriate vent
material. For polypropylene or stainless steel must use
approved suppliers transitions.
Prepare roof penetration
1. Vent pipe penetration:
a. Cut a hole for the vent pipe. For either combustible
or noncombustible construction, size the vent pipe
hole at least 0.4" larger than the vent pipe diameter.
b. Insert a galvanized metal thimble in the vent pipe
hole.
2. Follow all local codes for isolation of vent pipe when
passing through floors, ceilings and roofs.
3. Provide flashing and sealing boots sized for the vent
pipe and air pipe.
Vent termination and fittings
1. Prepare the vent termination coupling by inserting a
bird screen. Bird screens must be purchased separately.
See the parts list at the end of this manual for part
numbers.
2. Maintain the required dimensions of the finished
termination piping as shown in Figure 42.
Multiple vent terminations
1. When terminating multiple ECO boilers, terminate each
vent/air connection as described in this section.
2. Place adjacent terminations at least 6 inches apart.
3. For Canadian installations, provide clearances required
by Natural Gas and Propane Installation CAN/CSA
B149.1 or B149.2 Installation Code.
38
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aS fired water boiler
Vertical vent /sidewall air
— Boiler Manual
Figure 41
INSTALLATION SEQUENCE
sidewall air
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.
at left.
Step 2 Install the boiler in a location that allows proper routing of all
vent and air piping to the selected locations.
Step 3 Make sure the selected vertical termination location complies
with Figure 24, page 26.
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 penetration (vent) and sidewall penetration
(air) and secure penetration components as instructed in this
section.
Step 6 The air piping must terminate in a 90-degree 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 air and
vent 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 39
for general guidelines. Also comply with vent pipe manufacturer's
instructions.
Step 8 Insert the vent and air piping through the penetrations and
secure the termination fittings.
Step 9 Maintain clearances shown in this section. Vent and air
terminations must be fitted with bird screens 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.
— Vertical vent/
See notices
See notices at left.
Part number 550-142-190/1218