Install Instructions (Venting)

Part number 550-100-103/1110
A–11
GAS-FIRED WATER BOILER — Manual addendum — Venting
Vertical vent/air termination: 3” or 4” concentric
Termination kit — 3” or 4” PVC concentric
termination
The 3” or 4” PVC concentric termination kit must be purchased 1.
separately. See below.
Use only the vent materials and kits listed in Fig-
ure 2, page A-4 and Figure 4, page A-6 for concentric
venting. Provide pipe adapters as specified in Fig-
ure 4, page A-6.
Allowable vent/air pipe materials
Use only the materials listed in Figure 5, page A-7.
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 4, page A-6.
Maximum lengths listed in 2. Figure 4, page A-6 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 proceed 1.
to page A-18 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 12.
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 flue 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 flue products impinge on building surfaces
or plants.
Avoid possibility of accidental contact of flue 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.
Figure 12 Vertical termination — 3” or 4” PVC
concentric
Figure 13 Vertical termination — 3” or 4” PVC
concentric — multiple boilers
All vent and air pipes require a bird screen
at each termination
. Most kits do not
include the screens. Purchase separately
from Weil-McLain or vent kit supplier if
not included.