Specifications

Part number 550-100-090/0809
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
18
Sidewall vent/air termination: Weil-McLain cap
Vent and air pipe termination
options
This section covers sidewall termination using the 1.
Weil-McLain sidewall vent cap kit supplied with
each boiler.
Models 80, 105 and 155 are shipped with a a.
3-inch pipe size kit.
Models 230, 299 and 399 are shipped with a b.
4-inch pipe size kit.
The Weil-McLain sidewall vent/air cap kit in-c.
cludes the termination cap, inside and outside
wall plates, and mounting hardware to secure
the plates.
For other termination options and parts required, 2.
see page 62.
Vent and air pipe requirements
Vent and air pipe diameters can be as specified in 1.
Figure 13.
Vent and air pipe requirementsFigure 13
Boiler
models
2”
Plastic
3” Plastic or
3” AL29-4C
4” Plastic or
4” AL29-4C
80 & 105 Yes Yes No
155 No Yes No
230 No Yes Yes
299/399 No No Yes
Use appropriate adapters where needed — Ultra-80
through -155 require 3.5 inch outside diameter pipe at
the boiler vent and air connections. Ultra-230, -299 and
-399 boilers require 4.5 inch outside diameter pipe at the
boiler vent and air connections.
Vent and air pipe minimum length
Vent pipe and air pipe must each be at least 2 feet 1.
long, with 2 elbows if sidewall venting or 1 elbow
if vertical venting.
Vent and air pipe maximum length
See 1. Figure 15, page 19 for maximum length of
vent and air piping using the Weil-McLain sidewall
vent cap.
Vent and air pipe installation sequence
Install the boiler.Step 1
Determine the termination method — sidewall or vertical, Step 2
concentric or separate pipes, etc.
Determine proper location for wall or roof penetration for Step 3
each termination.
Install termination assembly as described in this manual.Step 4
Install air and vent piping from boiler to termination.Step 5
Install pipe supports and brackets as required.Step 6
Vent and air termination options
Figure 14
Sidewall termination
(Weil-McLain sidewall termination cap)
Other vent/air piping alternatives
— see information beginning on
page 62. Options include other
termination fittings and vertical
terminations.
Commonwealth of Massachusetts
When the boiler is installed within the Commonwealth of Massa-
chusetts:
This product must be installed by a licensed plumber or gas fit-•
ter.
Sidewall vent air installations — see instructions on • page 61.