User Guide

Part number 550-100-400/0717
20
®
SERIES 4 GAS-FIRED WATER BOILER — Boiler Manual
Sidewall vent/air termination: Separate pipes
&IGURE -AXIMUMPIPINGLENGTHSFORSEPARATEVENT
ANDAIRPIPESIDEWALLTERMINATION
"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 outside
diameter required at the boiler. You do not have to reduce allow-
able pipe length for the reducers.
** 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
&IGURE Sidewall termination — separate pipes —
confi guration options and minimum clearances
from vent to air terminations
Allowable vent/air pipe materials
1. Use only the materials listed in Figure 13, page 19 .
2. The Weil-McLain vent termination kit includes inside and
outside wall plates, bird screens, and mounting hardware to
secure the plates (kit included with boiler).
Maximum piping length
1. Locate the terminations such that the total air piping and vent
piping from the boiler to the termination will not exceed the
maximum length given in Figure 14 .
2. Maximum lengths listed in Figure 14 allow for 2 elbows. Ad-
ditional elbows required a reduction in maximum length as
explained in the table notes.
Connecting from termination to boiler
1. Install the terminations as instructed in the following. Then
proceed to page 82 to complete the air and vent piping be-
tween the termination and the boiler.
Determine location — separate elbows
A gas vent extending through an exterior wall shall
not terminate adjacent to the wall or below build-
ing extensions such as eaves, parapets, balconies
or decks. Failure to comply could result in severe
personal injury, death or substantial property dam-
age.
1. Locate the vent/air terminations using the following guide-
lines.
2. The air piping must terminate in a down-turned elbow as
shown in Figure 15 . This arrangement avoids recirculation
of fl ue products into the combustion air stream.
a. Apply the confi guration on the left side of Figure 15 unless
the terminations would fail to meet minimum clearance
to grade or snow line.
b. Apply the confi guration on the right side of Figure 15
when the terminations need to be raised higher to meet
clearance to grade or snow line.
c. The vent and air pipes may run up as high as 4 feet, as
shown in Figure 15 right side with no enclosure. The vent
and air pipes must be secured with braces, and all clear-
ances and lengths must be maintained. Space braces no
further than 24 inches apart. (See WARNING below for
extremely cold climates.)
d. External venting greater than 4 feet requires an insulated
enclosure around the vent and air pipes. The vent and air
terminations must exit through the enclosure as shown
in Figure 15 , maintaining all required clearances.
3. The vent piping must terminate in an elbow pointed outward
or away from the air inlet, as shown in Figure 15 .
Do not exceed the maximum lengths of the outside
vent piping shown in Figure 15 . Excessive length
exposed to the outside could cause freezing of con-
densate in the vent pipe, resulting in potential boiler
shutdown. In extremely cold climates, install an
insulated chase around the vent piping, particularly
when using longer lengths. The chase must allow
for inspection of the vent pipe, and insulation must
be protected from water.