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Venting - Bosch Pro Tankless GWH-450-ES Series Manual

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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3.6

Venting

Warning: Do not reduce the vent
(exhaust and combustion) pipe sizes
and do not common vent with any other
vented appliance or stove.
Warning: Failure to vent the exhaust
gases to the outside with sealed
stainless steel vent pipe (AL29-4C)
may result in dangerous flue gases
filling the space in which it is installed.
Warning: Do not mix vent pipe or
joining methods from different
manufactures.
Z flex
3" VENTING
TEE
3" Horizontal
Only
Terminal
Table 2 Terminals/Adapters Part Numbers
Caution: The vent system must be
installed by a qualified agency in
accordance with these instructions. If
improperly
installed
condition such as explosion or Carbon
Monoxide
poisoning
Bosch Water Heating will not be
responsible for improperly installed
appliances.
Establish vent clearances that comply with the vent
manufacturer's specifications. In all cases follow local
codes. See Table 3.
Diam.
Max
length
Exhaust
3 inches
39 feet
Vent
with 1
elbow
Intake
3 inches
39 feet
Vent
with 1
elbow
Table 3 Venting Specifications
The appliance should be located as close to the point
of termination as possible. The maximum vent length is
39 feet (12 m) with one 90 degree elbow. Subtract
feet from the total vent length for each additional 90°
elbow used (a maximum of four 90° elbows are
permitted in the total vent length), or subtract
every 45° elbow used. Horizontal sections of vent must
6 720 607 915
Protech
Heat Fab
TEE Only
9390 TEE
a
hazardous
could
result.
Material
Sealed stainless
steel (AL29-4C)
Aluminum flex,
PVC or any other
rigid or semi rigid
sealed 3 pipe
3
feet for
pitch ¼" for every foot of horizontal length, to prevent
the pooling of condensate, and be supported at 4 foot
intervals with overhead hangers.
Note: Listed thimbles or collars are necessary to pass
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. Note: Type-B vent should never
be used as the actual exhaust vent system for the
appliance, as it is not gas tight.
Minimum exhaust vent size and length
Fig. 8
Maximum exhaust vent and combustion air inlet
lengths
Fig. 9
Note: reduce
6
ft for each 90° elbow used after the first
one, reduce
3
ft for each 45° elbow.
Exhaust vent conditions
Caution: Any horizontal flue system
fitted to the appliance must incline
towards the appliance at an angle of
3% to prevente condensate dripping
from the flue terminal.
6
Installation instructions
The minimum exhaust vent length is
3 feet.
The use of a 90 degree elbow is
equivalent to
6
ft in vent length.
The use of 45 degree elbow is
equivalent to
3
ft in vent length.
11

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