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System configuration 4.1
Function description for single
circuit systems with two
indirect solar coils inside the
cylinder
(for layout, see page 20)
System configuration 5
Dual-circuit system with
two collector arrays and
two solar circuit pumps
(for layout, see page 21)
System configuration 6
Dual-circuit system with
two collector arrays and
one solar circuit pump
(for layout, see page 22)
System configuration 7
Dual-circuit system with
two collector arrays, two solar
cylinders with cylinder priority
control and two solar circuit
pumps
(for layout, see page 23)
12
System description
The solar module regulates the zone heating inside the
cylinders using temperature differential control. For this, the
cylinder temperatures are compared at two different points
(top and bottom) with the collector temperature. Subject to the
prevailing temperature, the solar circuit pump is either switched
ON or OFF, and the upper (priority operation) or lower section of
the cylinder is heated via the three-way diverter valve.
Initially, the upper section is heated, until its maximum
temperature has been reached or until the collector temperature
is inadequate for heating. After heating the upper section, the
system changes over to heat the lower section. If during the
heating of the lower section it is recognised that the upper
section can be heated again, the system changes back to heat
the upper section. If, within 30 min. there is no changeover
to the upper section, the solar circuit pump is switched OFF,
and the resulting collector temperature is evaluated. If, when
the pump is idle, the collector temperature rises far enough to
enable the upper section to be heated again, the SM2 module
changes over to heat the upper cylinder section. The lower
section continues to be heated if the collector temperature fails
to reach the required value.
Subject to the temperature differential, the solar cylinder can be
heated via collector array 1 or 2. For this, solar circuit pump 1 or 2
are started. If the collector temperature of both collector arrays is
adequate for cylinder heating, both solar circuit pumps will start.
This functions like system configuration 5, i.e. heating is achieved
via collector array 1 or 2 via motorised valves that are opened
accordingly. When the cylinder is heated the solar circuit pump
is always switched as well.
Note:
When installing motorised valves (el. V1 and el.V2)
ensure an adequate clearance between the collector
and the valve.
Otherwise the heat transfer can result in excessive
thermal stresses on the valves that may lead to their
failure.
Both cylinders are heated via priority control, as for system
configuration 4. Heating takes place via collector array 1 or 2,
depending on the prevailing temperature differential. If the collector
temperature of both collector arrays is adequate for cylinder heating,
both arrays will be used for heating, i.e. both solar circuit pumps
will start (as for system configuration 5).
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