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Maximum store temperature
S MX:
Maximum store temp.
Adjustment range:
4 ... 95 °C [40 ... 200 °F]
in steps of a 1 °C [2 °F]
Factory setting:
60 °C [140 °F]
Store emergency shutdown option
OSEM:
Store emergency shutdown
option
Adjustment range: OFF / ON
Factory setting: OFF
Collector temperature limitation
Emergency shutdown of the collector
EM:
Collector temperature
limitation
Adjustment range:
80 ... 200 °C [170 ... 390 °F]
in steps of 1 °C [2 °F]
Factory setting:
130 °C [270 °F]
Cooling functions
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Once the adjusted maximum temperature is exceeded,
the solar pump is switched off and further loading of the
store is prevented to reduce scald risk or system damage.
A fixed hysteresis of 2 K [4 °Ra] is set for the maximum
store temperature.
When the temperature at sensor 2 exceeds the adjusted
maximum store temperature, the
the display.
This option is used for activating the integrated store
emergency shutdown for an upper store sensor. If the
temperature at the reference sensor (S3) exceeds 95 °C,
the store will be blocked and loading will be stopped until
the temperature falls below 90 °C.
If the adjusted collector emergency shutdown temperature
EM is exceeded, the controller switches off the solar pump
(R1) in order to protect the system against overheating
(collector emergency shutdown). A hysteresis of 10 K
[20 °Ra] is set for the collector temperature limitation.
While the collector is in emergency shutdown,
is shown on the display.
WARNING!
Below, the three cooling functions – collector cooling,
system cooling and store cooling – are described in detail.
The following note is valid for all three cooling functions:
Note:
If the collector cooling or the system cooling
function is activated, the adjusted store tempe-
rature may be overridden. In order to prevent
system damage, the controller is also equipped
with an integrated store emergency shutdown if
the store reaches 95 °C [200 °F].
Note:
If the drainback option ODB is activated,
the adjustment range of EM is changed to
80 ... 120°C [170 ... 250 °F]. The factory setting
in that case is 95 °C [200 °F].
Danger of injury and system da-
mage through pressure surges!
If water is used as a heat transfer
medium in a pressure-less system,
the water will start boiling at 100 °C
[212 °F].
Î If a pressure-less drainback
system is used with water as a
heat transfer medium, do not
adjust the collector tempera-
ture limitation EM to more
than 95 °C [200 °F]!
Note:
The cooling functions will not become active as
long as solar loading is possible.
symbol is shown on
(flashing)
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