Commissioning; Commissioning The Dhw Cylinder; Instructions For The User; Shutdown - Bosch W 300-5 P Series Installation And Maintenance Instructions For The Contractor

6

Commissioning

NOTICE: System damage due to positive pressure!
Positive pressure can result in stress cracks in the glass
lining.
▶ Never close the discharge pipe of the pressure relief
valve.
▶ Commission all assemblies and accessories as specified in the
manufacturer's technical documentation.
Use only potable water to test the tightness of the DHW
cylinder.
6.1

Commissioning the DHW cylinder

Use only potable water to test the tightness of the DHW
cylinder.
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. 14, page 60).
6.2

Instructions for the user

WARNING: Risk of scalding at the DHW draw-off points!
There is a risk of scalding at the DHW draw-off points if
the DHW temperature is set above 60 °C and during
thermal disinfection.
▶ Advise users that they should draw off only 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 how to check the pressure relief valve.
▶ Hand all enclosed documents over to the user.
▶ User recommendation: Arrange a maintenance and inspection
contract with an approved contractor. Have the DHW cylinder
inspected and serviced annually at the specified maintenance
intervals ( Tab. 8, page 30).
▶ Highlight the following for the user:
– Water may be discharged from the pressure relief valve when
heating-up.
– The discharge pipe on the pressure relief valve must always be
kept open.
– Maintenance intervals must be observed ( Tab. 8, page 30).
– Recommendation in the case where there is a risk of frost and
when the user is briefly away: Keep the DHW cylinder in
operation and select the lowest possible DHW temperature.
W 300-5 P – 6 720 821 103 (2018/10)
7

Shutdown

▶ If an immersion heater has been installed (accessory), isolate the
DHW cylinder from the power supply ( Fig. 16, page 60).
▶ 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. 16 and 17, page 60).
▶ Decommission all assemblies and accessories of the heating system
as specified in the manufacturer's technical documentation.
▶ Close the shut-off valves ( Fig. 18, page 61).
▶ Depressurise the heat exchanger.
▶ Drain and blow out the heat exchanger ( Fig. 19, page 61).
▶ To prevent corrosion, dry out the inner space and keep the
inspection aperture covers open.
8

Environment/disposal

Environmental protection is a fundamental principle of the
Bosch Group.
Quality of products, efficiency and environmental protection are equally
important objectives for us. Environmental protection laws and
regulations are strictly adhered to.
Packaging
For the packaging, we participate in the country-specific recycling
systems, which guarantee optimal recycling. All of our packaging
materials are environmentally friendly and recyclable.
Used appliances
Old appliances contain materials that must be recycled.
The relevant assemblies are easy to separate, and all plastics are
identified. This allows the various assemblies to be sorted for
appropriate recycling or disposal.
Commissioning
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