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20 | Installation
B Push outer steam tube element with spring (L
into the lower boiler hub.
B Hook the other outer steam tube elements (L
each other as shown in the detail drawing.
B Hook on the outer steam tube element with the
handle (L
) last.
1
B Close off lower boiler hub with flat gasket and dummy
flange.
The length and number of outer steam tube
elements depend on the boiler rating, and
can be worked out using the
below.
Elements
9
10
L
1
–
480 mm
1
–
1
650 mm
L
1
1
510 mm
2
–
–
680 mm
L
450 mm
3
Tab. 11 Length and number of outer steam tube elements
1
3
2
4
Fig. 24 Inserting the outer steam tube
1
Outer steam tube element L
2
Dummy flange
3
Gasket
4
Outer steam tube element L
5
Outer steam tube element L
6 720 803 940 (2010/03)
) first
3
) onto
2
Tab. 11
11
12
13
14
15
–
1
–
1
–
1
–
1
–
1
–
2
2
–
–
1
–
–
2
2
1
5
6 720 648 663-21.1T
2
1
3
4.9
Boiler block pressure test (only
when supplied in loose sections)
A boiler block pressure test must be carried out (only
when supplied in loose sections). If supplied as a pre-
assembled block, the pressure test has already been
carried out in the factory.
For the further installation of a pre-assembled boiler
block, (
see Chapter 4.11.4, page 23).
4.9.1
Preparing for pressure test
WARNING: Risk of accident as a result of
ignoring the safety regulations.
B Observe the relevant country-specific
standards, work safety legislation and
16
regulations for carrying out pressure
tests.
–
B Close off flow and return connections (flow
1
connection flange with air vent valve).
3
NOTICE: Risk of system damage from
–
excessive pressure.
B The boiler block must not be connected
to the pipework of the heating system.
B Slowly fill the boiler block with water via the fill and
drain connection. Vent the boiler block via the boiler
flow connection with air vent.
4.9.2
Perform pressure test
Carry out a pressure test with a test pressure of 8.6 bar
(in accordance with the requirements of the European
Pressure Vessel Directive).
Use a pressure gauge class 1.0 to measure the pressure.
B Drain water via fill and drain valve (
page 19) upstream of the connection to the water
system, or if a hub joint is leaking.
4.9.3
Leaking hub joint
If you establish during the pressure test that hub joints
are leaking, follow the procedure described below.
Fig. 23, [1],
UNI 7000 F
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