Buderus Logalux SU200/5E W 8718543079 - Инструкция по эксплуатации - Страница 24

6

Commissioning

SU120/5, SU160/5, SU200/5, SU200/5E – 6 720 801 756 (2012/06)

24

5.2.1

Connecting the DHW cylinder on the water side

System example with all recommended valves and stopcocks 
(

Æ

Fig. 11, page 102).

B

Use installation material that is heat-resistant to 160 °C (320 °F).

B

Never use open vented expansion vessels.

B

Use metal connection fittings in DHW heating systems with plastic 
lines.

B

Size the drain line in accordance with the connection.

B

To facilitate blow-down, never install bends in the drain line.

B

Keep primary lines as short as possible and insulate them.

B

If using a non-return valve in the cold water supply: Install a safety 
valve between the non-return valve and the cold water inlet.

B

Install a pressure reducer if the static system pressure is in excess of 
5 bar. 

B

Seal all superfluous connections.

5.2.2

Installing a safety valve (on-site)

B

Install a type-tested safety valve that is approved for potable water 
(

≥

DN 20) in the cold water supply (

Æ

Fig. 11, page 102).

B

Observe the safety valve installation instructions.

B

Terminate the discharge pipe where it will be easily visible in the frost-
protected area above a drain.

–

The discharge pipe must be at least equal to the outlet cross-
section of the safety valve.

–

The discharge pipe must be able to discharge at least the flow rate 
that is feasible at the cold water inlet (

Æ

Table 4, page 22).

B

Attach a notice with the following text to the safety valve: "Never close 
the discharge pipe. During heating, water may be discharged for 
operational reasons."

If the static system pressure exceeds 80 % of the safety valve response 
pressure:

B

Install a pressure reducer upstream (

Æ

Fig. 11, page 102).

5.3

Installing the DHW temperature sensor

Fit one DHW temperature sensor respectively at test port [7] (for the 
solar thermal system) and [3] (for the heat source) for capturing and 
monitoring the DHW temperature at the DHW cylinder 
(

Æ

Fig. 3, page 99).

B

Install the DHW temperature sensor (

Æ

Fig. 12, page 102). Ensure 

that the sensor area has contact with the sensor well surface area over 
its full length.

5.4

IImmersion heater (accessory, only for SU200/5E)

B

Install the immersion heater in accordance with the separate 
installation instructions.

B

When installation of the cylinder is complete, inspect the earth 
conductor (including metal connection fittings).

6

Commissioning

B

Commission all assemblies and accessories as specified in the 
manufacturer's technical documentation.

6.1

Commissioning the DHW cylinder

On the DHW side, the test pressure must not exceed 10 bar (150 psi) 
positive pressure.

B

Flush the DHW cylinder and pipework thoroughly prior to 
commissioning (

Æ

Fig. 14, page 103).

6.2

Instructing users

B

Explain the operation and handling of the heating system and DHW 
cylinder, making a particular point of safety-relevant features.

B

Explain the function and checking of the safety valve.

B

Hand all enclosed documents over to the user.

B

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 (

Æ

Table 7, page 25).

B

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 (

Æ

Table 7, page 25).

–

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

Shutting  down

B

If an immersion heater has been fitted (accessory), isolate the DHW 
cylinder from the power supply .

B

Switch off the temperature controller at the control unit.

B

Drain the DHW cylinder (

Æ

Fig. 16 and 17, page 103).

B

Decommission all assemblies and accessories of the heating system 
as specified in the manufacturer's technical documentation.

B

Close the shut-off valves (

Æ

Fig. 18, page 104).

Mains pressure 

(static pressure)

Safety valve 

response pressure

Pressure reducer

in the EU

outside the EU

< 4.8 bar

≥

6 bar

Not  required

5 bar

6 bar

max. 4.8 bar

5 bar

≥

8 bar

Not  required

6 bar

≥

8 bar

max. 5.0 bar

Not required

7.8 bar

10 bar

max. 5.0 bar

Not required

Table 6 Selection of a suitable pressure reducer

NOTICE: 

Risk of system damage through excessive 

pressure!
Excessive pressure can result in tension cracks in the 
enamel coating.

B

Never close the blow-off line of the safety valve.

Check the DHW cylinder for leaks using potable water 
only.

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.

B

Advise users that they should only draw off mixed 
water.

WARNING: 

Scalding from hot water!

B

Let the DHW cylinder cool down sufficiently.