Install Instructions

Part number 550-100-090/1113
69
GAS-FIRED WATER BOILER — Boiler Manual
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Vertical 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.
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 81.
2. Maximum lengths listed in Figure 81 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 piping between the termination
and the boiler.
Determine location
Locate the concentric vent/air termination using the following guide-
lines:
1. The concentric vent/air assembly must terminate as shown in
Figure 82.
2. The vent and air piping connected to the termination assembly
must comply with the instructions in this supplement.
3. You must consider the surroundings when terminating the vent
and air:
a. Position the termination where vent vapors will not damage
nearby shrubs, plants or air conditioning equipment or be
objectionable.
b. The flue products will form a noticeable plume as they con-
dense in cold air. Avoid areas where the plume could obstruct
window views.
c. Prevailing winds could cause freezing of condensate and water/
ice buildup where flue products impinge on building surfaces
or plants.
d. Avoid possibility of accidental contact of flue products with
people or pets.
e. Do not locate the termination where wind eddies could affect
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
f. Locate or guard vent outlet to prevent condensate damage to
exterior finishes.
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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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&IGURE Vertical termination — Weil-McLain 3” PVC
concentric