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Bosch Pro Tankless GWH-450-ES Series Manual page 12

Temperature modulated with electronic ignition - normal duty suitable for recirculating potable water only
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Installation instructions
Fig. 10 Side vent
Fig. 11 Rear vent
Vent Safety System
The GWH-345/450-ESR 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 24. See error code to confirm error, correct the
problem and then reset the heater before operating.
Attaching the exhaust and air inlet connection
adaptors to the top of the heater
Fig. 12 Mounting sequence
12
Fig. 13 Exhaust
Fig. 14 Air inlet
B Attach the flue gas exhaust accessory (8 705 504
142) to the top of the unit (position 1) using the 4
screws and gasket provided, and fully insert 3"
stainless steel vent pipe into the accessory and
tighten the clamp (position 2).
B Place first gasket into fresh air intake.
B Place air deflector.
B Place second gasket and then the restrictor on top of
deflector (use table 4 for the correct side).
B Attach the combustion air inlet accessory (8 705
504 141) to the top of the unit (position 3) using the
4 screws and gasket provided, and fully insert 3"
combustion air pipe into the accessory and tighten
the clamp (position 4). NOTE: The appliance has the
possibility to mount the combustion air inlet
accessory only on the top right side of the heater.
The left side must be kept sealed.
6 720 607 915

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