Installation Guide
Part number 550-100-066/0608
g a s -f i r e d w at e r b o i l e r — Boiler Manual
32
Venting/air piping — general (continued)
Vent and air pipe diameters
Vent and air pipe diameters can be as specified in 1.
Vent and air pipe diameters options
155
230
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
Vent pipe and air pipe must each be at least 2 feet long, with 2 el-1.
bows if sidewall venting or 1 elbow if vertical venting.
Vent and air pipe maximum length
Maximum length of pipe depends on the termination method, the 1.
boiler size and the pipe diameter used.
See the maximum length information for each termination method 2.
listed in the appropriate section.
Vent and air pipe termination options
Vent and air piping must terminate out the same side (or roof) 1.
of the building, using only one of the methods described in this
manual. Refer to the associated installation manual section for the
method chosen.
Sidewall options (2. Figure 34, left side):
Weil-McLain termination plate (kit included with boiler).a.
Concentric PVC pipe (requires special kit, b. page 93).
Separate air pipe and vent pipe, .c.
Vertical options (3. Figure 34, right side):
Concentric PVC pipe (requires special kit, a. page 93).
Separate air pipe and vent pipe.b.
Vent and air pipe installation sequence
Install the boiler.
Determine the termination method — sidewall or vertical,
concentric or separate pipes, etc.
Determine proper location for wall or roof penetration for
each termination.
Install termination assembly as described in this manual.
Install air and vent piping from boiler to termination.
Install pipe supports and brackets as required.
Sidewall
termination
Vertical
termination