User Guide

Part number 550-100-400/0717
68
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.
&IGURE Maximum piping lengths for Weil-McLain
sidewall vent/air plate
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.
"OILER
5LTRA
-AXIMUM
0IPINGv
-AXIMUM
0IPINGv
-AXIMUM
0IPINGv
Feet Elbows Feet Elbows Feet Elbows
-80 ** 100 2 100 2
Not
allowed
-105 ** 100 2 100 2
-155 Not allowed 100 2
-230 Not allowed 30 2 100 2
-299/310 Not allowed Not allowed 100 2
-399 Not allowed Not allowed 100 2
* 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:
sFEETFOREACHADDITIONALINCHELBOWOR
sFEETFOREACHADDITIONALORINCHLONGRADIUSELBOW
sFEETFOREACHORINCHSHORTRADIUSELBOW
sFEETFOREACHORINCHDEGREEELBOW
®
SERIES 4 GAS-FIRED WATER BOILER — Boiler Manual
&IGURETermination location – Weil-McLain vent/air plate
– height above grade or snow line
Sidewall vent/air termination: Weil-McLain cap (cont.)