Specifications

Part number 550-100-090/0809
73
g a s -f i r e d w a t e r b o i l e r — Boiler Manual
ADVANCED INSTALLATION
Vertical vent/air termination: Separate pipes
Allowable vent/air pipe materials
Use only the materials listed in 1. Figure 12, page 17.
Purchase bird screens for vent and air terminations separately. See 2.
the parts list at the end of this manual.
Maximum piping length
Locate the terminations such that the total air piping and vent pip-1.
ing from the boiler to the termination will not exceed the maximum
length given in Figure 88.
Maximum lengths listed in 2. Figure 88 allow for 1 elbow. Additional
elbows required a reduction in maximum length as explained in
the table notes.
Connecting from termination to boiler
Install the termination penetrations as instructed in the follow-1.
ing. Then proceed to page 75 to complete the piping between the
termination and the boiler.
Determine location
Locate the vent/air terminations using the following guidelines:1.
The air piping must terminate in a down-turned 180-degree return 2.
bend as shown in Figure 89. Locate the air inlet pipe no further
than 2 feet from the center of the vent pipe. This placement avoids
recirculation of flue products into the combustion air stream.
The vent piping must terminate in an up-turned coupling as shown 3.
in Figure 89. The top of the coupling must be at least 1 foot above
the air intake. The air inlet pipe and vent pipe can be located in
any desired position on the roof, but must always be no further
than 2 feet apart and with the vent termination at least 1 foot
above the air intake.
You must consider the surroundings when terminating the vent 4.
and air:
Position the vent termination where vapors will not damage a.
nearby shrubs, plants or air conditioning equipment or be
objectionable.
The flue products will form a noticeable plume as they con-b.
dense in cold air. Avoid areas where the plume could obstruct
window views.
Prevailing winds could cause freezing of condensate and water/c.
ice buildup where flue products impinge on building surfaces
or plants.
Avoid possibility of accidental contact of flue products with d.
people or pets.
Do not locate the terminations where wind eddies could affect e.
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
Do not terminate above any door or window. Condensate can f.
freeze, causing ice formations.
Locate or guard vent to prevent condensate damage to exterior g.
finishes.
Maximum piping lengths for separate vent Figure 88
and air pipe vertical termination
Boiler
Ultra–
Maximum
Piping, 2” *
Maximum
Piping, 3” *
Maximum
Piping, 4” *
Feet Elbows Feet Elbows Feet Elbows
80 30 1 100 1
Not
allowed
105 30 1 100 1
155 Not allowed 100 1
230 Not allowed 30 1 100 1
299 Not allowed Not allowed 100 1
399 Not allowed Not allowed 100 1
* Install reducers as necessary where connecting to the boiler
vent and air connections.
For piping using more than 1 elbow, reduce maximum allow-
able 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.
NOTE: The 180-degree return bend is included in the allowed
fittings. No deduction is required.
Figure 89 Vertical termination — separate pipes