Bosch Appliances GWH 2400 ES NG Water Heater User Manual


 
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Installation instructions
9
upwards towards termination ¼" for every foot of
horizontal length, to prevent the pooling of condensate,
and be supported at 4 foot intervals with overhead
hangers.
Exception: horizontal run between last elbow
and termination must pitch down to termination
1/4" per foot.
Note: For horizontal terminations, venting must
terminate once it penetrates to the outside of the
structure. There must be no sections of vent pipe
exposed to the outdoors.
Note: Listed thimbles or collars are necessary where
venting passes through wall and ceiling partitions. If the
vent system passes through combustible areas where
the vent clearance requirements cannot be maintained,
it is permissible to chase straight sections of sealed 3
inch single wall vent through 4 inch (or greater) Type-B
vent. The distance to combustibles using this chase
technique is 1 inch
1)
. Note: Type-B vent must never
be used as the actual exhaust vent system for the
appliance, as it is not gas tight and illegal for use
with this appliance. This will create a serious
health hazard and void the warranty.
For specific questions concerning vent material, speci-
fications, usage or installation, please contact the vent
manufacturer directly.
Minimum exhaust vent length
Fig. 8
Maximum exhaust vent and combustion air inlet
lengths
Fig. 9 Maximum vent and combustion air lenghts
Note: reduce 2.5 ft for each 90° elbow used after the
first one, reduce 1.25 ft for each 45° elbow, see table 2,
page 8.
Refer to chapter 3.3.2, page 12 for condensate drain
requirements.
Vent Safety System
The GWH 2400 ES will shut down if inadequate
exhaust venting is detected or a lack of combustion air
is provided to the unit; see troubleshooting section on
page 35. See error code to confirm error, correct the
problem and then reset the heater before operating.
1) in all cases, follow local codes.
3”
VENTING
Z flex Protech Heat Fab
3”
Horizontal
Terminal
2SVSTB03 FSTB3 9390 TEE
3” Vertical
terminator
2SVSRCF03 FSRC3 5300CI
Table 3 Terminator Part Numbers
Fittings or Piping Equivalent
feet m
45 degree elbow 1.25 0.38
90 degree elbow 2.5 0.76
pipe per foot 1 0.30
Table 4 Friction Loss Equivalent in piping and fittings
Company Contact info
Z-flex www.z-flex.com
800-654-5600
ProTech Industries www.protechinfo.com
800-766-3473
Heat-Fab www.heatfab.com
800-772-0739
Table 5 Vent manufacturers
The maximum exhaust
vent and combustion air
inlet lengths with one
elbow are 26ft.