Bosch Integra 500 Installation Manual page 11

3.3.2 Vent specifications
Establish vent clearances that comply with the vent
manufacturer's specifications
national/local codes.
Venting specifications
Diam.
E
x
h
a 3 or 4 inches
u
s
t
I
n
t
3 or 4 inches
a
k
e
Table 4 Venting specifications for intake and exhaust
Condensate drain requirements
An external condensate drain (not supplied with the
heater) must be installed under the following
conditions:
• All vertical terminating vent installations.
• Horizontal terminating vent installations where the
total linear vent length is greater than 6 feet (1.8 m).
• Vent installations where any section of the exhaust
vent pipe passes through an unconditioned space.
Minimum combustion air and exhaust pipe
length
The minimum exhaust pipe length is 3 feet (1m) of
straight vent pipe. The minimum combustion air pipe
length is one 90° elbow.
Maximum combustion air and exhaust pipe
length
The following tables (Tables 5 & 6) display the
maximum allowable straight
combustion air and exhaust piping with consideration to
the number of elbows used.
Note: 90°
i
terminations should not be counted
in the exhaust and combustion air
piping.
6 720 680 226
and all applicable
Aproved terminals
"T" terminal
90° elbow
Concentric
(196016)
"T" terminal
90° elbow
Concentric
(196016)
pipe lengths
elbows used for
Step 1: If using the twin pipe penetration system, refer
to table 5. If using the concentric vent kit
system, refer to table 6.
Step 2: Total the number of 90° elbows and 45°
elbows used on the exhaust piping.
Step 3: Use this value in the appropriate table to
determine the maximum straight exhaust pipe
length allowed.
Step 4: Total the number of 90° elbows and 45°
elbows used on the combustion air piping.
Step 5: Use this value in the appropriate table to
determine the maximum straight combustion
air pipe length allowed.
Twin Pipe
System
0 N/A*
N/A*
1
2
# of 45°
3
elbows
4
5
6
Maximum allowable straight pipe length (ft)
Table 5 Maximum allowable straight pipe length (twin
pipe)
* Not allowed. At least one 90º elbow required.
** Not allowed. Minimum of 3 feet (1m) of straight pipe required.
Concentric
pipe System
0 N/A*
N/A*
1
for
2
# of 45°
3
elbows
4
5
6
Maximum allowable straight pipe length (ft)
Table 6 Maximum straight pipe length (concentric ter-
minal)
* Not allowed. At least one 90º elbow required.
** Not allowed. Minimum of 3 feet (1m) of straight pipe required.
Note: Include pipe length that is part of the concentric terminal.
Installation instructions
# of 90° elbows
0 1 2
26 21 16
23 18 13
23 20 15 10
20 17 12
17 14 9
14 11 6 N/A**
11 8 3 N/A**
# of 90° elbows
0 1 2
18 13
15 10
15 12 7 N/A**
12 9 4 N/A**
9 6 N/A** N/A**
6 3 N/A** N/A**
3 N/A** N/A** N/A**
3 4
11
8
5
7 N/A**
4 N/A**
N/A**
N/A**
3 4
8 3
5 N/A**
N/A**
N/A**
N/A**
N/A**
N/A**
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