Fixing The Appliance; Water Connection; Hydrogenerator Operation; Gas Connection - Bosch Therm 4300 Series Installation And User Instructions Manual

smaller than the dimension specified in the appliances
dimensions table.
• The extremity of the evacuation pipe must be protected
against wind/rain
CAUTION: Ensure that the extremity of the
evacuation pipe is placed between the ledge
and the ring of the flue.
Where these conditions are not possible to achieve, an
alternative location must be selected.
Flue ducts
If the flue duct goes through walls and/or furniture containing
flammable material:
▶ Thermal insulate the duct to ensure that the temperature of
the contact surface is less than 85 °C.
Surface temperature
The maximum surface temperature of the appliance is below
85 °C. Special protection measures are not required for
inflammable building materials or housings.
Air admission
The place where the heater is to be installed must have an area
of air supply according to the table.
Appliance
T4300 11-2D
T4300 14-2D
T4300 18-2D
Table 6 Useful areas for air admission
Minimum requirements are listed above. Local regulations
should always be observed.
5.3

Fixing the appliance

▶ Remove the temperature/flow selector and the power
selector.
▶ Unscrew the cover fixing screws.
▶ Remove the outer case by sliding it forwards and then
lifting upwards.
▶ Fix the appliance using the sleeves and hooks supplied so
that it is vertical.
CAUTION: Never allow the appliance to rest
against water or gas pipes.
Therm 4300 – 6 720 821 607 (2018/01)
Minimum area
60 cm 2
90 cm 2
120 cm 2
Installation (must be carried out only by qualified technicians)
5.4

Water connection

It is advisable to drain the appliance before installing it as any
dirt or grit inside it could reduce the water flow rate and, in
extreme cases, could completely clog up the appliance.
▶ Mark cold water [A] and hot water pipes [B], so as to
prevent confusion.
▶ Connect pipe to water valve using the connecting kit
supplied.
Fig. 11 Water connection
It is advisable to install a non-return valve on
the supply side of the heater to avoid
problems caused by sudden changes in
supply pressure.
5.5

Hydrogenerator operation

The hydrogenerator (hydrodynamic generator) is inserted 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 between
1,7VRMS and 2,2 VRMS AC. In this way, there is no need for
batteries.
5.6

Gas connection

DANGER:
Non-compliance with legal standards
applicable may cause a fire or explosion,
causing material damage or personal injury
or even death.
Only use original accessories.
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