Bosch C 1210 ES Installation Manual page 12

Installation instructions
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
Vertical & horizontal terminations approved
k
e
Table 4 Venting specifications for intake and exhaust
* ULC S636-95, UL1738 certified
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 1 feet (0.3m) of
straight vent pipe. The minimum combustion air pipe
length is one 90° elbow.
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 5 if using 3" diameter
venting. Refer to table 6 if using 4" diameter venting.
12
and all applicable
Aproved terminals
"T" terminal
90° elbow
PVC Flue Cap*
(ECAP321)
Vertical terminations only
3" diameter only
Concentric
(196016)
"T" terminal
90° elbow
PVC Flue Cap*
(ECAP321)
3" diameter only
Concentric
(196016)
3"
Venting Maximum
allowable
Exhaust
pipe length
Twin pipe
31ft
system
Concen-
23ft
tric system
Table 5 Maximum Allowable Exhaust and Combustion
Air Lengths for 3" venting
4"
Venting Maximum
allowable
Exhaust
pipe length
Twin pipe
63ft
system
Concen-
23ft
tric system
Table 6 Maximum Allowable Exhaust and Combustion
Air Lengths for 4" venting
Use of elbows
It is recommended to limit the amount of elbows used in
the exhaust and combustion air piping to reduce friction
in the air flow. The following lists the maximum amount
of 90° elbows allowed in either the exhaust or combus-
tion air piping:
Max. number of 90°
elbows
Twin pipe system
Concentric system
Table 7
Two 45° elbows are equal to one 90°
i
elbow. Any combination of 45° and
90° elbows may be used in the vent
system as long as the combination
does not exceed the maximum listed
in table 7 above.
Maximum Elbow
allowable Equivalency
Combustion
air pipe
length 90° 45°
31ft 5 ft 3 ft
23ft 5 ft 3 ft
Maximum Elbow
allowable Equivalency
Combustion
air pipe
length 90° 45°
63ft
2.5ft 1.5ft
23ft
2.5ft 1.5ft
3" 4"
venting venting
5 7
4 6
6 720 644 887