Bosch GWH 2400 ES NG User Manual page 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
1)
technique is 1 inch . 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.
3" Z flex
VENTING
3"
Horizontal 2SVSTB03
Terminal
3" Vertical
2SVSRCF03
terminator
Table 3 Terminator Part Numbers
Fittings or Piping
45 degree elbow
90 degree elbow
pipe per foot
Table 4 Friction Loss Equivalent in piping and fittings
For specific questions concerning vent material, speci-
fications, usage or installation, please contact the vent
manufacturer directly.
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
1) in all cases, follow local codes.
6 720 608 782
Protech Heat Fab
FSTB3 9390 TEE
FSRC3 5300CI
Equivalent
feet m
1.25 0.38
2.5 0.76
1 0.30
Minimum exhaust vent length
Fig. 8
Maximum exhaust vent and combustion air inlet
lengths
The maximum exhaust
vent and combustion air
inlet lengths with one
elbow are ≥ 26ft.
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.
Installation instructions
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