Install Instructions (Venting)

Part number 550-100-103/1110
GAS-FIRED WATER BOILER — Manual addendum — Venting
A–8
Sidewall 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.
Commonwealth of Massachusetts
When the boiler is installed within the Commonwealth of Mas-
sachusetts:
This product must be installed by a licensed plumber or gas s
fitter.
See instruction in the Boiler manual.s
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. 1.
Then proceed to 2. page A-18 to complete the air and vent piping
between the termination and the boiler.
The center lines between the air and vent are wider at the concentric 3.
termination connections than at the boiler. See Figure 15, page A-13
for suggestions on adjusting the spacing when required. In addi-
tion to the method given there, you can rotate the Y-fitting slightly,
which will cause the air pipe to be slightly higher or lower than
the vent, but the center lines will match those at the boiler vent
and air connections.
Determine locations for terminations
A gas vent extending through an exterior wall shall not
terminate adjacent to the wall or below building exten-
sions such as eaves, parapets, balconies or decks. Failure
to comply could result in severe personal injury, death
or substantial property damage.
Locate the vent/air terminations using the following guidelines.
You must consider the surroundings when terminating the vent 1.
and air:
Position the vent termination where vapors will not damage a.
nearby shrubs, plants or air conditioning equipment or be
objectionable.
Termination location — 3” or 4” PVC Figure 6
concentric termination — height above grade
or snow line
Termination location — 3” or 4” PVC Figure 7
concentric termination — clearances to
openings
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.