23
22
Expansion vessels absorb the volumetric changes during
heating or cooling of the liquid and provide a liquid reserve
to compensate for minor leakages.
In accordance with the VDI guidelines, the connection
of the diaphragm expansion vessel is on the inlet side
(suction side), i.e. underneath the pump (cf. Technical Data).
Suitable, correctly designed expansion vessels
only are to be used (cf. DIN 4807).
Use backup vessels if necessary depending
on the predominant temperatures.
3.6 Connecting an expansion vessel (provided on site)
Important:
-
top shut-off devices : open (Position 2) (see Chapter 3)
-
bottom shut-off device : open (Position 1) (see Chapter 3)
It is important to ensure that the lower shut-off on the
volumetric flow meter is set to Position 1 during filling
(see section 3.2.) and the ball valves to 45°
(Position 2). This position opens the backflow preventer.
When the process is complete, open the lower and upper
shut-off (see section 3.2.)!
Warning (see section 3.2.):
Upper shut-off : Automatic (Position 1)
Lower shut-off : open (position 2)
Improper venting causes a pressure drop and can result
in malfunctions in the solar system.
The temperature of the escaping air and heat transfer
medium can be higher than 60 °C; therefore there is
an increased risk of scalding.
The vent is located at the highest point in the system.
After venting, increase the system pressure back to the
operating pressure!Vent occasionally at permanent
venter (optional) in operating condition.
3.7 Heat transfer medium
4.3
Venting
GB
▪
Expansion tank connection
Permanent vent optional
3. Installation
When draining the system, be sure the handle of the forward flow ball valve is set to 45° before the forward flow
side is drained at the lowest point. In this position, the non-return valve is open. The return flow side has to be
drained both at the lowest point in the pipework circulation system and at the safty set with the drain valve. When
water is used, be sure the pipeline system is completely drained.
The heat transfer fluid should be collected in a
suitable container and disposed of according to the manufacturer‘s instructions in an environmentally sound manner.
Note: The system is usually under pressure. Danger of scalding!
4.1 Leak test
Check the connections, components and connections for leaks. If there are any leaks, drain and repair the
system and repeat the leak test.
4.2 Flushing and filling
Carry out a flush of the system suited for the requirements, doing so in accordance. Before commissioning, all
particles of soiling and air have to be removed from the system. If water is used for flushing, if there is a danger
of freezing, the system must be completely drained or immediately replaced with antifreeze agent. Bear in mind
that the lower shut-off on the volume flow meter has to be closed during filling, and the ball valve handle in the
forward flow set to 45° C. This position will result in the non-return valve being pened. The collectors have to be
covered to prevent injuries and/or damage.
4.4 Draining
4. Pressure test, filling and flushing the system
Use brine solutions only with antifreeze suitable for solar systems!
Note the manufacturer and type, as these may possibly not be allowed
to be mixed with other manufacturers‘ media.
The following work may be carried out by trained
qualified personnel only.
When performing the pressure test (leak test), filling and
flushing the system, ensure that all shut-off fittings are open.
The collectors must be covered.
Do not undertake any switching procedures to relieve
pressure using the shut-off fitting
4. Pressure test, filling and flushing the system
The following work must only be carried out by trained specialists. When pressure testing, filling,
and flushing the system, it must be ensured that all shut-off valves are open. The collectors must
be cooled down and covered to prevent injuries or damages! The system should be filled during
the morning or evening hours on days with high levels of solar radiation. Do not perform any
switching operations with the shut-off valves to release pressure.
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