Commissioning; Commissioning The Cylinder; Volumetric Flow Rate Limitation Of Domestic Hot; Water - Bosch Stora WP 400 PK Installation And Service Instructions Manual

6

Commissioning

DANGER
Danger of cylinder damage through positive pressure!
Positive pressure can result in stress cracks in the glass lining.
▶ Never close the discharge pipe of the pressure relief valve.
▶ Before connecting the cylinder, carry out a tightness test on the
water lines.
▶ Commission the wall mounted boiler, assemblies and accessories
according to the manufacturer's notices and the technical
documentation.
6.1

Commissioning the cylinder

▶ Before filling the cylinder:
purge the pipework and cylinder with potable water.
▶ Fill the cylinder whilst a DHW draw-off point is fully open,
until water flows steadily from it.
▶ Carry out tightness test.
Only perform the tightness test of the cylinder using potable water.
On the DHW side, the test pressure must not exceed 10 bar positive
pressure.
Setting the cylinder temperature
▶ Set the required cylinder temperature in accordance with the
operating instructions of the wall mounted boiler, taking the risk
of scalding at the DHW draw-off points into consideration
( Chapter 6.3).
Thermal desinfection
▶ Carry out regular thermal disinfection in accordance with the
operating instructions of the wall mounted boiler.
WARNING
Risk of scalding!
Hot water can lead to severe scalding.
▶ Carry out thermal disinfection only outside the normal hours of use.
▶ Inform occupants of the building about the risk of scalding and
monitor the thermal disinfection process, or install a thermostatic
DHW mixer.
6.2 Volumetric flow rate limitation of domestic hot water
To make the best use of the cylinder capacity and to prevent premature
mixing of the cylinder content, we recommend restricting the cold water
inlet to the cylinder on-site to the following volumetric flow rate:
Memory
WP 400 PK
WP 500 P
WP 700 P
Table 19 Volumetric flow rate limitation
Stora – 6721835341 (2021/04)
Maximum flow limitation
20 l/min
20 l/min
25 l/min
6.3

Instructions for the user

WARNING
Risk of scalding at the DHW draw-off points!
Depending on the system and operating conditions (thermal disinfection)
there is a risk of scalding at the DHW draw-off points in DHW mode.
Installation of a thermal mixer is prescribed when setting a DHW
temperature via 60 °C.
▶ Advise users that they should draw off only mixed water.
▶ Explain the operation and handling of the heating system and
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 operator: Conclude a maintenance and
inspection contract with an approved contractor. Have the cylinder
serviced and inspected annually at the specified maintenance
intervals ( Tab. 20).
Highlight the following for the user:
▶ Setting the DHW temperature.
– Water may be discharged from the pressure relief valve when
heating-up.
– Always keep discharge pipe for pressure-relief valve open.
– Comply with maintenance intervals ( Tab. 20).
– Where there is a risk of frost and when the operator is briefly
away: Keep the heating system in operation and set the lowest
possible DHW temperature.
7

Decommissioning

▶ Switch off the temperature controller at the control unit.
WARNING
Risk of scalding from hot water!
Hot water can cause serious burns.
▶ Allow the cylinder to cool down sufficiently.
▶ Drain the cylinder.
▶ Decommission all assemblies and accessories of the heating system
according to the notices in the manufacturer's technical documentation.
▶ Close the shut-off valves.
▶ Depressurise the heat exchanger.
▶ When there is a risk of frost and the cylinder is decommissioned,
drain the container completely, including its lower section.
To prevent corrosion:
▶ Leave the cover of the inspection aperture open to allow the interior
to dry completely.
Commissioning
35