Install Instructions

Part number 550-100-090/1113
63
GAS-FIRED WATER BOILER — Boiler Manual
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Sidewall vent/air termination: 3” PVC concentric
Termination kit — Weil-McLain 3” PVC concentric
termination
1. The Weil-McLain 3” PVC concentric termination kit must be
purchased separately. See Figure 117, page 113 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.
Commonwealth of Massachusetts
When the boiler is installed within the Commonwealth of Mas-
sachusetts:
s This product must be installed by a licensed plumber or gas
fitter.
s See instruction on page 61.
Allowable vent/air pipe materials
1. Use only the materials listed in Figure 12, page 17.
Maximum piping length
1. Locate the termination such that the total air piping and vent piping
from the boiler to the termination will not exceed the maximum
length given in Figure 68.
2. Maximum lengths listed in Figure 68 allow for 1 elbow. Additional
elbows required a reduction in maximum length as explained in
the table notes.
Connecting from termination to boiler
1. Install the termination as instructed in the following. Then pro-
ceed to page 75 to complete the air and vent piping between the
termination and the boiler.
2. The center lines between the air and vent are wider at the concentric
termination connections than at the boiler. See Figure 86, page 72
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.
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Feet Elbows Feet Elbows Feet Elbows
80 ** 100 1 100 1
Not
allowed
105 ** 100 1 100 1
155 Not allowed 100 1
230 Not allowed 30 1 70 1
299 Not allowed Not allowed 70 1
399 Not allowed for any application
* 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.
** Ultra-80 and 105 boilers installed with 2-inch vent piping
automatically derate due to the pressure loss in the vent and
air piping. The derate ranges up to 10% for the Ultra-80 at 100
feet or 15% for the Ultra-105 at 100 feet.
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:
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sFEETFOREACHORINCHSHORTRADIUSELBOW
sFEETFOREACHORINCHDEGREEELBOW
&IGURE Termination location — Weil-McLain vent/air
plate — height above grade or snow line
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