Filling And Flushing Of The System - Roth ST 20/11 Manual

Pump station ST 20/11
1.2 Mounting pipes into a cutting ring connection
• At first, slide over the copper pipe (1), the connecting
nut (2), then the compression ring (3). To assure that
there is a save force transmission and sealing the pipe
has to stand out of the compression ring for aprox.
3 mm.
• Slide the copper pipe (1) into the support sleeve (4).
• The copper pipe (1) with its slipped-on components
(2;3;4) has to be pushed as far as it will go into the
housing of the cutting ring connection (5).
• Firstly the connecting nut has to be tightened by hand.
Afterwards use a flat spanner to turn the connecting
nut at least one rotation.
2. Filling and flushing the system
• Connect flexible pressure tubes to the KFE-cock below
the manometer and open the cock.
• Connect the flexible tube to the KFE-cock for flushing
and open the cock afterwards.
• The slit of the regulating screw at the flowmeter has to
be adjusted horizontally. Thus the integrated ball valve is
closed (see manual flowmeter). Open the non-return
valve above the pump; therefore adjust the ball valve
by means of a combination- or flat-wrench in position
of 45°(half opened, half closed).
• Fill sufficient solar fluid into a canister of a filling station
(not included in full kit) and fill the solar system.
• By means of the filling station flush the solar system at
least 15 minutes. To get the air completely out of the
system, it is necessary to open the regulation screw at
the flowmeter (slit vertical) temporary in between.
• The complete solar system must not be flushed with
water. As a total emptying of the system is not possible
mostly, there is a danger of frost damage.
• Close the KFE-cock (outflow cock) while the filling
pump is running and increase the system pressure to
aprox. 6 bar. The system pressure can be read off at the
manometer.
• Close the filling cock and switch-off the pump of the
filling cock, open the regulation screw (slit vertical).
• Bleed the system above the collector until the solar
fluid is free of blow holes. Increase the testing pressure
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> 3 mm
5
4
Please note:
In order to absorb the expansion pressure of the pipes, the
relevant fittings (expansion bushings) or pipe-level (consi-
sting of more than two 90° bows) are necessary.
For pipe-levels the space between the bows has to be twice
than the diameter of the pipe in cm.
[Example: diameter of the pipe = 18 mm; space between the
bows more than 36 cm].
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3 1
to aprox. 6 bar again and check the thickness of the
system. In case of dramatically decrease of pressure one
has an untight location in the system is to assume.
• Adjust the system pressure according to the general
instructions of the system manufacturer (possibly aprox.
1,8 to 2,3 bar with a height of the collector above the
manometer of aprox. 5 to 10 m, thereby observe the
primary pressure of the expansion vessel).
• Start the circulation pump with its maximum pump
speed (see manual of the circulation pump) and let it
pump for at least 15 minutes.
• Afterwards adjust the pump speed to the favoured
pump speed.
• Adjust the volume flow at the flowmeter according
to the general instructions of the collector's manufac-
turer.
• Remove the tube of the filling station and screw the
catch to the filling station's cocks.
• Recheck the system again for thinkness. Open the ball
valve above the pump completely.
• Mount the front insulation jacket to the solar group.
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