Install Instructions

Part number 550-100-090/1113
73
GAS-FIRED WATER BOILER — Boiler Manual
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Vertical vent/air termination: Separate pipes
Allowable vent/air pipe materials
1. Use only the materials listed in Figure 12, page 17.
2. Purchase bird screens for vent and air terminations separately. See
the parts list at the end of this manual.
Maximum piping length
1. Locate the terminations such that the total air piping and vent pip-
ing from the boiler to the termination will not exceed the maximum
length given in Figure 88.
2. Maximum lengths listed in 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
1. Install the termination penetrations as instructed in the follow-
ing. Then proceed to page 75 to complete the piping between the
termination and the boiler.
Determine location
1. Locate the vent/air terminations using the following guidelines:
2. The air piping must terminate in a down-turned 180-degree return
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.
3. The vent piping must terminate in an up-turned coupling as shown
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.
4. 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 flue products will form a noticeable plume as they con-
dense 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 flue products impinge on building surfaces
or plants.
d. Avoid possibility of accidental contact of flue products with
people or pets.
e. Do not locate the terminations where wind eddies could affect
performance or cause recirculation, such as inside building
corners, near adjacent buildings or surfaces, window wells,
stairwells, alcoves, courtyards or other recessed areas.
f. Do not terminate above any door or window. Condensate can
freeze, causing ice formations.
g. Locate or guard vent to prevent condensate damage to exterior
finishes.
&IGURE -AXIMUMPIPINGLENGTHSFORSEPARATEVENT
ANDAIRPIPEVERTICALTERMINATION
"OILER
5LTRAn
-AXIMUM
0IPINGv
-AXIMUM
0IPINGv
-AXIMUM
0IPINGv
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:
sFEETFOREACHADDITIONALINCHELBOWOR
sFEETFOREACHADDITIONAL
2 or 3-inch long radius elbow
sFEETFOREACH2 or 3-inch short radius elbow
s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.
&IGURE Vertical termination — separate pipes