Commissioning; Commissioning The Dhw Cylinder; Instructions For The User; Shutdown - Bosch W 120-5 O1 Installation And Maintenance Instructions For Contractors

Commissioning

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.
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. 13, page 47).
▶ Carry out tightness test ( Fig. 12, page 47).
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.
▶ Recommendation for the user: Sign a maintenance and inspection
contract with an approved contractor. Have the DHW cylinder
inspected and serviced annually at the specified maintenance
intervals ( Tab. 9, page 29).
▶ 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. 9, page 29).
– 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.
28
7

Shutdown

▶ 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 (Chapter 9.2.3, page 29).
▶ Decommission all assemblies and accessories of the heating system
as specified in the manufacturer's technical documentation.
▶ Close the shut-off valves.
▶ Depressurise the heat exchanger.
▶ Drain and blow out the heat exchanger.
▶ To prevent corrosion, dry out the inner space and keep the
inspection aperture covers open.
8

Environment/disposal

Environmental protection is one of the fundamental company policies of
the Bosch Group.
Results quality, efficiency and environmental protection are equally
important objectives for us. Environmental protection laws and
regulations are strictly adhered to.
To protect the environment, we use the best possible technology and
materials while taking economic aspects into account.
Packaging
For the packaging, we participate in the country-specific recycling
systems, which guarantees optimal recycling. All of our packaging
materials are environmentally compatible 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.
W 120-5 O – 6 720 819 306 (2018/10)