Bosch GWH 2400 ES NG Manual page 15

Warning: Approved terminators must
be used for inlet and exhaust vent
systems to prevent rain from entering
the appliance, failure to do so may result
in damage to the appliance. This failure
is not covered under the manufacturer's
warranty.
Fig. 19
Open combustion installation (SINGLE PIPE
SYSTEM)
Not recommended in cold climate areas, see
chapter 3.4, page 17.
Fig. 20
Connecting a one piece 90 degree elbow pipe to the
combustion air inlet adaptor is required. This will
prevent debris or objects from falling into the appliance.
The exhaust vent system must vent directly to the
outside of the building and an adequate amount of
indoor combustion air must be provided for this
installation. See chapter 3.4.
Note: reduce 2.5 ft for each 90° elbow used after the
first one, reduce 1.25 ft for each 45° elbow.
A maximum of three 90-degree elbows are permitted.
6 720 608 782
Determining installation adjustment
The GWH 2400 ES comes factory set to accomodate
most common venting arrangements. Determine the
elbows and straight pipe you will require for exhaust and
combustion air. Refer to the the table below to deter-
mine if the factory setting for the fan is adequate. If your
venting system is longer and exceeds the values listed
in table 9 or table 10, proceed to Section 6.7, page 36
for fan speed adjustment.
TWIN PIPE
One 90°
elbow or
less
I
One 90°
19'
n
elbow or less
t
Two 90°
16.5'
a
elbows
k
Three 90°
e
14'
elbows
Maximum combined intake and
exhaust straight pipe length. Pro-
ceed to section 6.7 if your installa-
tion exceeds the values in this
table.
Table 9 Installation adjustment calculation
SINGLE PIPE
One 90°
elbow or
less
I No intake
19'
n piping
t
Maximum straight pipe length.
a
Proceed to section 6.7 if your
k
installation exceeds the values in
e
this table.
Table 10 Installation adjustment calculation
Note: Maximum of three 90° elbows allowed for exhaust
and three 90° elbows allowed for intake.
Installation instructions
Exhaust
Two 90° Three 90°
elbows elbows
16.5' 14'
14' 11.5'
11.5' 9'
Exhaust
Two 90° Three 90°
elbows elbows
16.5' 14'
15