Bosch C 950 Installation And Operation Instruction Manual page 18

Installation instructions
4.3.2 Vent specifications
Establish vent clearances that comply with the vent
manufacturer's specifications and all applicable national/local
codes.
Venting specifications
Diam. Approved terminals
E 3 or 4 inches "T" terminal
x
2, 3 or 4 90° elbow
h
inches
a
3 inches PVC Flue Cap*(ECAP321)Vertical
u
terminations 3" diameter only
s
t
3 or 4 inches Concentric (196016, 196006)
I 3 or 4 inches "T" terminal
n
2, 3 or 4 90° elbow
t
inches
a
3 inches PVC Flue Cap*(ECAP321)Vertical &
k
horizontal terminations approved 3"
e
diameter only
3 or 4 inches Concentric (196016, 196006)
[1] ULC S636-95, UL1738 certified
Table 7 Venting specifications for intake and exhaust
Condensate drain requirements
When the Water Heater is installed in a residential single family
dwelling without direct recirculation an external condensate
drain is not required.
If the Water Heater is installed in an application other than a
residential single family dwelling an external condensate drain
(not supplied with the Water Heater) is required in the following
circumstances:
• Vertical terminating exhaust vent installations.
• Horizontal terminating exhaust vent installations greater
than 6 feet (1.8 m) linear measurement, (NOT total
equivalent length).
• Vent installations where any section of the exhaust vent
pipe passes through an unconditioned space.
Note: An external condensate drain is recommended in all
installations as best practice in order to maximize the longevity
of the Water Heater.
Minimum combustion air and exhaust pipe length
The minimum exhaust pipe length is 1 foot (0.3m) of straight
vent pipe. The minimum combustion air pipe length is one 90°
elbow, except with the Common Vent System where the
provided air intake grill cap is used.
18
Maximum combustion air and exhaust pipe length
The following tables display the maximum allowable straight
pipe lengths for combustion air and exhaust piping with
consideration to the number of elbows used. Reduce the
equivalent length for each elbow used from the maximum
allowable length depending on the system used.
Refer to table 8 if using 2" diameter venting.
Refer to table 9 if using 3" diameter venting.
Refer to table 10 if using 4" diameter venting.
2" Venting Maximum
allowable
Exhaust
pipe
length
Twin pipe 9.5ft
with two
terminations
1) If using 90° short sweep elbow.
2) If using 90° long sweep elbow.
Table 8 Maximum Allowable Exhaust and Combustion Air
Lengths for 2" PVC venting
3" Venting Maximum
allowable
Exhaust pipe
length
Twin pipe with 31ft
two
terminations
Twin pipe with 23ft
concentric
termination
Table 9 Maximum Allowable Exhaust and Combustion Air
Lengths for 3" PP, PVC, CPVC, and ABS venting
4" Venting Maximum
allowable
Exhaust pipe
length
Twin pipe 63ft
Concentric 43ft
Table 10 Maximum Allowable Exhaust and Combustion Air
Lengths for 4" PP, PVC, CPVC, and ABS venting
C 950/C 1050 (Pro TL 175 C/199 C) – 6 720 805 440 (2019/10)
Combustion Elbow
air pipe Equivalency
length
90° 45°
1)
9.5ft 5 ft / 2.5 ft
2)
2.5 ft
Combustion Elbow
air pipe Equivalency
length
90°
31ft 5 ft
23ft 5 ft
Combustion Elbow
air pipe length Equivalency
90°
63ft 2.5ft
43ft 2.5ft
45°
3 ft
3 ft
45°
1.5ft
1.5ft