Heater Mounting; Water Connection; Hydrogenerator Operation; Pressure Relief - Bosch GWH 10-2 G Series Installation Manual And Operating Instructions

DANGER: Make sure that all flue connections
are sealed.
▶ Fit the flue pipe with an approved flue cowl.
▶ Failure to follow this requirement may
cause dangerous exhaust gases to enter
living space which may result in personal
injury or loss of life.
DANGER:
Every part of the flue system must be in the
vertical plane.
CAUTION:
Ensure that the flue is installed to the
requirements of AS5601, including the
requirement to terminate the flue above the
roof level.
If any of these conditions cannot be met, a different location
must be selected.
Surface temperature
The maximum surface temperature of the heater is less than
85 °C, with the exception of the flue piping. No special
protection measures are required for flammable construction
materials or built-in furniture items.
Air intake
The place where the heater is to be installed must have an
adequate air supply as per AS5601.
4.3

Heater mounting

▶ Remove the temperature/flow selector and the gas selector
knobs.
▶ Unscrew the cover fixing screws.
▶ With a simultaneous movement forwards and upwards,
release the cover from the two lugs at the back.
▶ Fix the heater vertically, using the provided screw hooks
and plugs or use fixings appropriate for the material &
weight.
CAUTION:
Never support the gas heater on the water or
gas connections.
6 720 608 992 (2018/01)
4.4

Water connection

It is advisable to purge the water pipes before connection,
because the presence of dirt may reduce the flow and, in
extreme cases, cause a blockage.
▶ Identify the cold water pipe (Fig. 5, [A]) and the hot water
pipe (Fig. 5, [B]), so as to avoid any possible cross-
connection.
▶ Connect the water pipes to the water valve using the
connection accessories provided.
B
Fig. 5 Water connection
CAUTION:
If fitting an isolating valve to the water inlet line
it must be a Gate or Ball Valve, a Stop Cock or
Non-Return Valve must not be fitted.
4.5

Hydrogenerator operation

The hydrogenerator (hydrodynamic generator or HDG) is
located in the water circuit between the water valve and the
heat exchanger. This component has a turbine that rotates
when water flows past its blades. This movement is transmitted
to an electric generator which powers the heater ignition unit.
The electrical voltage value supplied by the HDG is
approximately 3.0 VAC.
4.6

Pressure Relief

The pressure relief (Fig. 2, [33]) will release pressure from the
system whenever the value exceeds 1500 kPa.
Installation
A
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