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Bosch Stora W 750 Seite 28

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28 | Commissioning
W 500-5X... | W 750-5X... | W 1000-5X...6 720 820 733 (2017/09)
▶ Use metal connection fittings in potable water heating systems with
plastic pipes.
▶ Size the drain line in accordance with the connection.
▶ To facilitate blow-down, never install elbows in the drain pipe.
▶ If using a non-return valve in the pipework to the cold water inlet:
install a pressure relief valve between the non-return valve and the
cold water inlet.
▶ Install a pressure reducer, if the static pressure in the system is
> 5 bar.
▶ Seal all unused connections.
▶ During filling, open the highest positioned tap ( Fig. 21, page 72).
5.3.2 Installing a pressure relief valve (provided by the
customer)
▶ Install a pressure relief valve that is approved for potable water
(DN 20) in the cold water pipe ( Fig. 19, page 72).
▶ Observe the installation instructions for the pressure relief valve.
▶ Terminate the discharge pipe of the pressure relief valve via a
dewatering point, which is located in a frost-proof area that is easily
visible.
– The discharge pipe must be at least equal to the outlet cross-
section of the pressure relief valve.
– The discharge pipe must be able to discharge at least the flow
rate, which may possibly arise at the cold water inlet
( tab. 3, page 25).
▶ Attach a notice with the following text to the pressure relief valve:
"Never close the discharge pipe. During heating, water may be
discharged for operational reasons."
If the static pressure in the system exceeds 80 % of the response
pressure for the pressure relief valve:
▶ Install a pressure reducer upstream ( Fig. 19, page 72).
5.4 Fitting the hot water temperature sensor
For measuring and monitoring the DHW temperature at the cylinder:
▶ Fitting the DHW temperature sensor ( Fig. 20, page 72).
Positions of the test points:
• W 500...1000-5X... ( Fig. 2, page 67):
Fit activation and deactivation sensors at position 4 and 5.
6 Commissioning
▶ Commission all assemblies and accessories as specified in the
manufacturer's technical documents.
6.1 Commissioning the DHW cylinder
After the cylinder has been filled, it must be subjected to a pressure test.
On the DHW side, the test pressure must not exceed 10 bar (150 psi)
positive pressure.
▶ Carrying out the leak test ( Fig. 23, page 73).
▶ Flush the DHW cylinder and pipework thoroughly prior to
commissioning ( Fig. 24, page 73).
6.2 Instructing users
▶ Explain the operation and handling of the heating system, the
primary store system and the DHW cylinder, making a particular
point of safety-relevant features.
▶ Explain the function and checking of the pressure relief valve.
▶ Hand all enclosed documents over to the owner/operator.
▶ Recommendation for the user: Sign a maintenance and inspection
contract with an approved contractor. Have the DHW cylinder
serviced and inspected annually at the specified service intervals
( tab. 8, page 29).
▶ Highlight the following points to the user: setting the DHW
temperature.
– When heating-up, water may be discharged from the pressure
relief valve.
– The discharge pipe for the pressure relief valve must always be
kept open.
– Service intervals must be observed ( tab. 8, page 29).
– Where there is a risk of frost and when the user is briefly
away: Keep the heating system in operation and set the lowest
possible DHW temperature.
▶ Only fill DHW cylinders with potable water.
Gas supply
pressure
(static pressure)
Excess pressure for
pressure relief
valve
Pressure reducer
Within
the EU Outside the EU
< 4.8 bar 6 bar Not
required
Not
required
5 bar 6 bar 4.8 bar 4.8 bar
5 bar 8 bar Not
required
Not
required
6 bar 8 bar 5.0 bar Not required
7.8 bar 10 bar 5.0 bar Not required
Table 7 Selection of a suitable pressure reducer
▶ Ensure that the sensor area has contact with the
sensor pocket area for the sensor‘s full length.
NOTICE: Risk of system damage from excessive
pressure.
Excessive pressure can result in tension cracks in the
enamel coating.
▶ Never close the blow-off line of the safety relief valve.
Only carry out the leak test for the DHW cylinder with
potable water.
WARNING: Risk of scalding at the DHW draw-off points!
There is a risk of scalding at the DHW draw-off points
during thermal disinfection and if the DHW temperature
is set above 60 °C.
▶ Advise users that they should only draw off mixed
water.
… 28 …

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