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5
Inspection and maintenance
5 .1
Switching off during the summer: Safety through Steam Back
5 .2
Maintenance
7651255 - v.01 - 23052016
Remeha solar installations with RemaSOL control stations include three-
way protection that prevents damage to the solar energy system itself and
that potentially caused by the system (particularly when it is switched off).
See
The manual accompanying the control station.
Explanation
The installation has been designed so that no special safety
measures are required in the summer when the user will be away
for a longer period of time.
Attention
The control station may not be switched off and the heat conducting
liquid may not be drained.
The control station for the solar energy system keeps the system in
operation as long as mains electricity is available and the circulation pump
is working. With the functions for boiler protection, collector protection,
night-time cooling and complete shutdown, the system is always kept
within the desired parameters without the system entering the steam
phase. In the event of a pump failure, Steam Back also ensures that no
problems develop for the house owner when the steam temperature of
> 140 °C is reached. When a temperature of 145 °C is reached and a
pressure of approximately 2.5 bar is exceeded in the installation, one
drop of collector liquid evaporates in the collector for every two litres
of saturated vapour (steam). Within a tenth of a second the resulting
pressure increase forces the liquid out of the collector and into the
expansion vessel provided for this purpose. This all happens very quickly,
without noise and without steam pressure. The solar energy system is
now empty. There is no load on the system, because the collectors no
longer contain any collector liquid.
The collector liquid is not affected, because it is not in the collector. When
the temperature in the collector drops below 135 °C again, the two litres
of steam in each condenser condenses to one drop of collector liquid.
The collector liquid stored in the expansion vessel is released back to the
collector. The installation is filled automatically. During the next start of
the solar energy system the collector circuit is opened for three minutes.
If micro-bubbles have formed, these are now separated via the Airstop
in the station. At the end of the three minutes the installation starts
completely again. Steam Back ensures safe operation of the installation,
completely automatically, without the need for manual intervention. For a
collector surface area of 10 m
vessel a buffer vessel must be installed to provide storage capacity for
larger quantities of collector liquid. Steam Back protects all components of
the solar energy system. The solar energy station with integrated Airstop,
the special expansion vessel, the safety valve, the collectors with single pipe
and the control station for the system.
We recommend entering a maintenance contract that includes annual or
biannual inspection of the liquid level, anti-freezing protection and system
pressure as well as a leak check and overall check for correct operation.
5 Inspection and maintenance
or greater, in addition to a regular expansion
2
HFS 650 / HSF 700
23
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