Fitting Temperature Sensors; Immersion Heater (Accessory); Commissioning; Commissioning The Dhw Cylinder - Buderus SF300.5 Instrucciones De Instalación Y Mantenimiento Para El Técnico

6

Commissioning

If the static system pressure exceeds 80 % of the safety valve response
pressure:
▶ Install a pressure reducer upstream ( Fig. 9, page 47).
Mains pressure Safety valve
(static pressure) response pressure
 6 bar
< 4.8 bar
5 bar 6 bar
 8 bar
5 bar
 8 bar
6 bar
7.8 bar 10 bar
Table 7 Selection of a suitable pressure reducer
5.3

Fitting temperature sensors

To measure and monitor the water temperature, fit the temperature
sensors at the test points [4] and [5] ( Fig. 2, page 45).
▶ Fit the temperature sensor ( Fig. 10, page 47). Ensure that the
sensor area has contact with the sensor pocket area for the sensor's
full length.
5.4

Immersion heater (accessory)

▶ Install the immersion heater in accordance with the separate
installation instructions.
▶ When installation of the tank is complete, inspect the ground
conductor (including metal connection fittings).
6 Commissioning
NOTICE: Risk of system damage through excessive
pressure!
Excessive pressure can result in tension cracks in the
enamel coating.
▶ Never close the blow-off line of the safety relief valve.
▶ Commission all assemblies and accessories as specified in the
manufacturer's technical documentation.
6.1

Commissioning the DHW cylinder

Check the DHW cylinder for leaks using potable water
only.
On the DHW side, the test pressure must not exceed 10 bar (150 psi)
positive pressure.
▶ Flush the DHW cylinder and pipework thoroughly prior to
commissioning ( Fig. 12, page 48).
18
Pressure reducer
in the EU outside the EU
Not required
max. 4.8 bar
Not required
max. 5.0 bar Not required
max. 5.0 bar Not required
6.2

Instructing users

WARNING: Risk of scalding at the hot water draw-off
points!
There is a risk of scalding at the hot water draw-off
points if the DHW temperature is set above 60 °C and
during thermal disinfection.
▶ Advise users that they should only draw off mixed
water.
▶ Explain the operation and handling of the heating system and DHW
cylinder, making a particular point of safety-relevant features.
▶ Explain the function and checking of the safety valve.
▶ Hand all enclosed documents over to the user.
▶ User recommendation: Arrange an inspection/maintenance
contract with an approved heating contractor. Have the DHW
cylinder inspected and, if required, serviced annually in accordance
with the service intervals stated ( Tab. 8, page 19).
▶ Highlight the following for the user:
– Water may be discharged from the safety valve during heat-up.
– The safety valve discharge pipe must always be kept open.
– Service intervals must be observed ( Tab. 8, page 19).
– Recommendation in the case where there is a risk of frost and
when the user is briefly away: Keep the DHW in operation and
select the lowest possible DHW temperature.
7

De-commissioning

▶ If an immersion heater has been fitted (accessory), isolate the DHW
cylinder from the power supply ( Fig. 14, page 48).
▶ Switch off the temperature controller at the control unit.
WARNING: Risk of scalding from hot water.
▶ Let the DHW cylinder cool down sufficiently.
▶ Drain the DHW cylinder ( Fig. 14 and 15, page 48).
▶ Decommission all assemblies and accessories of the heating system
as specified in the manufacturer's technical documentation.
▶ Close the shut-off valves ( Fig. 16, page 49).
▶ Depressurize the external heat exchanger.
▶ Drain and blow out the external heat exchanger
( Fig. 17, page 49).
▶ To prevent corrosion, dry out the cylinder's inner space and keep the
inspection aperture covers open.
8

Environmental protection/Disposal

Environmental protection is a fundamental principle of the
Bosch Group.
Quality of products, efficiency and environmental protection are equally
important objectives for us. All legislation pertaining to the environment
is strictly observed.
Packaging
We are dedicated in adhering to country-specific disposal standards as
they relate to packaging to ensure optimum recycling. All packaging
materials are environmentally compatible and can be recycled.
Used appliances
Used appliances contain materials that should be recycled.The
assemblies are easy to separate and the types of plastic used are
identified. This allows the various assemblies to be appropriately sorted
for recycling or disposal.
SF300.5 | SF400.5 – 6720819340 (2020/10)