Vent And Combustion Air Pipe Length [For Single Boiler Installations] - Riello Condexa PRO NA 75 P Service Manual

1.13.4 Vent and combustion air pipe length [For single
boiler installations]
The maximum length for vent and combustion air pipes can be
found in the following table. Please note the length is for each
vent/combustion air pipe and not combined.
Condexa PRO NA 75 P
4" (110 mm) 100 ft (30 m)
In the following tables are listed the equivalent length for PP pipes:
1 ft vent pipe
45° elbows
90° elbows
3" 4"
(80 mm) (110 mm)
1 ft vent
1 ft 1 ft
pipe
1 ft flex pipe 2 ft 2 ft
45° elbows 3 ft 5 ft
90° elbows 7 ft 12 ft
Tee 12 ft 19 ft
Condexa PRO NA 117 P
100 ft (30 m)
4" (100mm)
1 ft
4 ft
7 ft
5" 6" 8"
(130 (150 (200
mm) mm) mm)
1 ft 1 ft 1 ft
2 ft N/A N/A
6 ft 6 ft 13 ft
14 ft 14 ft 19 ft
21ft 22 ft 29 ft
When the total flue system equivalent length is verified it is nec-
essary to set the par N° 99 "Flue length range" according to the
total length of the installed flue system as defined in the follow-
ing tables
Condexa PRO NA 75 P
3" System
Value for par 99 with Max.
eq. length of
1 0 to 50 ft
2 51 to 100 ft
3 101 to 150 ft
4 151 to 200 ft
Condexa PRO NA 117 P
3" System
Value for par 99 with Max.
eq. length of
1 0 to 10 ft
2 11 to 20 ft
3 21 to 30 ft
4 31 to 40 ft
Defining the correct value to assign to par N° 99 follow this ex-
ample:
When using a Condexa PRO NA 117 P with 4" (110 mm) PP venting
material the maximum equivalent length is 100 feet for both vent
and combustion air piping. Consider the equivalent length of vent
pipe is 56 ft. and the combustion air pipe is 42 ft. First step is to
verify that both the vent and combustion air pipe is less than 100
ft:
− 56<100 : verified
− 42<100 : verified
The sum of equivalent length of vent and combustion air pipe is:
− 56+42=98 ft. See Tab. for defining parameter 99
Row 2 - System with Max eq. length of 100 ft + 100 ft. The example
provided a total equivalent length of 98 ft. which falls in between
51 - 100 ft found on row 2. So par N° 99 = 2.
19
GENERAL INFORMATION
4" System 5" System
with Max. with Max.
eq. length of eq. length of
0 to 82 ft 0 to 82 ft
83 to 165 ft 83 to 165 ft
166 to 248 ft 166 to 248 ft
249 to 330 ft 249 to 330 ft
4" System 5" System
with Max. with Max.
eq. length of eq. length of
0 to 50 ft 0 to 82 ft
51 to 100 ft 83 to 165 ft
101 to 150 ft 166 to 248 ft
151 to 200 ft 249 to 330 ft