Weil-McLain Ultra Manual page 32

-
gas fired water boiler
Venting/air piping — general
Vent and air pipe diameters
1. Vent and air pipe diameters can be as specified in
Figure 33
Vent and air pipe diameters options
Boiler models 2" Plastic
80 & 105 Yes
No
155
No
230
No
310
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 & -310 boilers require 4.5 inch outside diameter pipe at the
boiler vent and air connections. Concentric terminations and the Weil-
McLain sidewall plate require 3.5 inch outside diameter pipe.
Vent and air pipe minimum length
1. Vent pipe and air pipe must each be at least 2 feet long, with 2 el-
bows if sidewall venting or 1 elbow if vertical venting.
Vent and air pipe maximum length
1. Maximum length of pipe depends on the termination method, the
boiler size and the pipe diameter used.
2. See the maximum length information for each termination method
listed in the appropriate section.
Vent and air pipe termination options
1. Vent and air piping must terminate out the same side (or roof)
of the building, using only one of the methods described in this
manual. Refer to the associated installation manual section for the
method chosen.
2. Sidewall options ( Figure 34, left side):
a. Weil-McLain termination plate (kit included with boiler).
b. Concentric PVC pipe (requires special kit,
c. Separate air pipe and vent pipe, .
3. Vertical options ( Figure 34, right side):
a. Concentric PVC pipe (requires special kit,
b. Separate air pipe and vent pipe.
Vent and air pipe installation sequence
Step 1
Install the boiler.
Step 2
Determine the termination method — sidewall or vertical,
concentric or separate pipes, etc.
Step 3
Determine proper location for wall or roof penetration for
each termination.
Step 4
Install termination assembly as described in this manual.
Step 5
Install air and vent piping from boiler to termination.
Step 6
Install pipe supports and brackets as required.
32
— Boiler Manual
3" Plastic or 4" Plastic or
3" AL29-4C 4" AL29-4C
Yes No
Yes No
Yes Yes
No Yes
page 93).
page 93).
(continued)
Figure 34
Vent and air termination options
Sidewall
termination
Weil-McLain sidewall
termination plate
(Go to page 33)
Weil-McLain
3" PVC concentric
termination
(Go to page 36)
Sidewall termination
with separate vent
and air pipes
(Go to page 39)
Vertical
termination
Weil-McLain
3" PVC concentric
termination
(Go to page 42)
Vertical termination
with separate vent
and air pipes
(Go to page 46)
Part number 550-100-066/0608