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
42
Vertical vent/air termination: 3” PVC concentric
Termination kit — Weil-McLain 3” PVC concentric
termination
The Weil-McLain 3” PVC concentric termination kit must be pur-1.
chased separately. See Figure 101, page 93 for part number.
Use only the Weil-McLain 3” PVC concentric termina-
tion kit for concentric venting. Provide pipe adapters as
needed for 2” or 4” plastic piping or for AL29-4C vent
pipe.
Purchase a bird screen separately. See the parts list at the end of 2.
this manual.
Allowable vent/air pipe materials
Use only the materials listed in 1. Figure 32, page 31.
Maximum piping length
Locate the termination such that the total air piping and vent piping 1.
from the boiler to the termination will not exceed the maximum
length given in Figure 55.
Maximum lengths listed in 2. Figure 55 allow for 1 elbow. Additional
elbows required a reduction in maximum length as explained in
the table notes.
Connecting from termination to boiler
Install the termination as instructed in the following. Then pro-1.
ceed to page 48 to complete the piping between the termination
and the boiler.
Determine location
Locate the concentric vent/air termination using the following guide-
lines:
The concentric vent/air assembly must terminate as shown in 1.
Figure 56.
The vent and air piping connected to the termination assembly 2.
must comply with the instructions in this supplement.
You must consider the surroundings when terminating the vent 3.
and air:
Position the termination where vent vapors will not damage a.
nearby shrubs, plants or air conditioning equipment or be
objectionable.
The ue products will form a noticeable plume as they con-b.
dense in cold air. Avoid areas where the plume could obstruct
window views.
Prevailing winds could cause freezing of condensate and water/c.
ice buildup where ue products impinge on building surfaces
or plants.
Avoid possibility of accidental contact of ue products with d.
people or pets.
Do not locate the termination where wind eddies could affect e.
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
Locate or guard vent outlet to prevent condensate damage to f.
exterior finishes.
Feet Elbows Feet Elbows Feet Elbows
80 30 1 100 1
Not
allowed
105 30 1 100 1
155 Not allowed 100 1
230 Not allowed 30 1 70 1
310 Not allowed Not allowed 70 1
* Install pipe reducers to adapt from pipe size used to the 3.5 inch
outside diameter required at the termination. You do not have to
reduce allowable pipe length for the reducers. Also install reduc-
ers as necessary where connecting to the boiler vent and air
connections.
You do not have to reduce allowable pipe length for the 45° elbow
used to connect to the air fitting on the concentric assembly.
For piping using more than 1 elbow, reduce maximum allowable
length:
• 7 feet for each additional 4-inch elbow (90° or 45°)
• 7 feet for each additional 3-inch long radius elbow
• 16 feet for each 3-inch short radius elbow
• 7 feet for each 3-inch 45-degree elbow.
Vertical termination — Weil-McLain 3” PVC
concentric