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System configuration 1
Single circuit system
(for layout, see page 16)
System configuration 2
Single circuit system with
return temperature raising
for central heating backup
(for layout, see page 17)
System configuration 3
Dual-circuit system with
two solar cylinders in parallel
operation
(for layout, see page 18)
System configuration 4.0
Dual-circuit system with
two solar cylinders with
cylinder priority control
(for layout, see page 19)
3062438_0309
System description
If the temperature differential between collector and solar cylinder
exceeds the selected start differential, the solar circuit pump will be
started, and the cylinder will be heated up to the selected maximum
cylinder temperature (temperature differential control).
The buffer cylinder will be heated if the temperature differential
between the collector and the buffer cylinder exceeds the start
temperature.
When the buffer cylinder temperature is adequate, the heating
return will be routed via the buffer cylinder, thereby raising the
return temperature.
You can use system configuration 2 also for transferring heat
between two cylinder, e.g. with connection set Solar CGS / CGW /
CGI (part no. 27 44 465).
With cylinder priority control, the cylinder with priority will be heated
first. If during priority heating the temperature differential between
the collector and the cylinder with priority exceeds the selected
value for parallel cylinder operation, the lower ranking cylinder will
be heated in parallel to the cylinder with priority.
This utilises the excess energy that cannot be transferred to the
cylinder with priority to heat the lower ranking cylinder.
With priority control, only one of the two cylinders can be heated
at any one time.
Initially, the cylinder with priority is heated, until its maximum cylinder
temperature has been reached or until the collector temperature
is inadequate for heating.
After heating the cylinder with priority, the system changes over to
heat the next cylinder in the sequence. If during the heating of the
lower ranking cylinder it is recognised that the cylinder with priority
can be heated again, the system changes back to that cylinder.
If, within 30 min. there is no changeover to the cylinder with priority,
the solar circuit pump is switched OFF, and the resulting collector
temperature is evaluated. If, with the pump idle, the collector
temperature increases far enough to enable the cylinder with
priority to be heated, the system reverts to that cylinder. If not, the
lower ranking cylinder will continue to be heated.
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