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S
4
®
ERIES
Sidewall vent/air termination:
Provide pipe adapters as needed where pipe size
is different from termination connections or
boiler connections, and for all AL29-4C vent pipe
connections at the boiler and the termination.
Allowable vent/air pipe materials
1. Use only the materials listed in Figure 13, page 19 .
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 69 .
2. Maximum lengths listed in Figure 69 allow for 2 elbows.
Additional elbows required a reduction in maximum length
as explained in the table notes.
Maximum piping lengths for Weil-McLain
sidewall vent/air plate
Feet
Elbows
-80 **
100
2
-105 **
100
2
-155
Not allowed
-230
Not allowed
-299/310
Not allowed
-399
Not allowed
* 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
reducers 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.
For piping using more than 2 elbows, reduce maximum allowable
length:
68
-
GAS
FIRED WATER BOILER
Feet
Elbows
Feet
Elbows
100
2
Not
100
2
allowed
100
2
30
2
100
2
Not allowed
100
2
Not allowed
100
2
— Boiler Manual
Weil-McLain cap
Connecting from termination to boiler
1. Install the termination as instructed in the following. Then
proceed to page 71 to complete the air and vent piping between
the termination and the boiler.
Determine location for termination cap
A gas vent extending through an exterior wall shall
not terminate adjacent to the wall or below building
extensions such as eaves, parapets, balconies or decks.
Failure to comply could result in severe personal
injury, death or substantial property damage.
1. Locate the vent/air terminations using the following guidelines.
2. You must consider the surroundings when terminating the
vent and air:
a. Position the vent termination where vapors will not damage
nearby shrubs, plants or air conditioning equipment or be
objectionable.
b. The fl ue products will form a noticeable plume as they
condense 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 fl ue products impinge on building
surfaces or plants.
Termination location – Weil-McLain vent/air plate
– height above grade or snow line
(cont.)
Part number 550-100-400/0717
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