Ultra Boiler Manual

Part number 550-100-440/0122
20
  
Separate pipes
Figure 14 Maximum piping lengths for separate vent
and air pipe sidewall termination
Boiler
Ultra
Maximum
Piping, 2” *
Maximum
Piping, 3” *
Maximum
Piping, 4” *
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 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 allowable 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:
• 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 15 Sidewall termination — separate pipes — con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. e 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. en
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. e air piping must terminate in a down-turned elbow as
shown in Figure15. is arrangement avoids recirculation
of ue products into the combustion air stream.
a. Apply the conguration on the le side of Figure15 unless
the terminations would fail to meet minimum clearance
to grade or snow line.
b. Apply the con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. e vent and air pipes may run up as high as 4 feet, as
shown in Figure15 right side with no enclosure. e 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. e vent and air
terminations must exit through the enclosure as shown in
Figure15, maintaining all required clearances.
3. e 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. e chase must allow
for inspection of the vent pipe, and insulation must
be protected from water.