Vertical Vent/Air Termination: 3" Pvc Concentric; Determine Location - Weil-McLain Ultra 3 series User Manual

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gas fired water boiler
Vertical vent/air termination:
Termination kit — Weil-McLain 3" PVC concentric
termination
1. The Weil-McLain 3" PVC concentric termination kit must be pur-
chased 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
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
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.
Part number 550-100-090/0809
— Boiler Manual
Figure 12, page 17.
Figure 81 allow for 1 elbow. Additional
3" PVC concentric
Figure 81 Maximum piping lengths for Weil-
McLain 3" PVC concentric termination
Boiler Maximum Maximum
Ultra– Piping, 2" * Piping, 3" *
Feet Elbows Feet
80 ** 100 1 100
105 ** 100 1 100
155 Not allowed 100
230 Not allowed 30
299 Not allowed Not allowed
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
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:
• 7 feet for each additional 4-inch elbow (90° or 45°)
• 7 feet for each additional 2 or 3-inch long radius elbow
• 16 feet for each 2 or 3-inch short radius elbow
• 7 feet for each 2 or 3-inch 45-degree elbow.
Figure 82
Vertical termination — Weil-McLain 3" PVC
concentric
Maximum
Piping, 4" *
Elbows Feet Elbows
1
Not
1
allowed
1
1 70 1
70 1
Also install reduc-
69