CMN:
Minimum collector tempe-
rature
Adjustment range: 10 ... 90 °C
Factory setting: 10 °C
CMX:
Collector maximum temp.
Adjustment range:
100 ... 190 °C
Factory setting: 120 °C
4.1.11 System cooling
When the adjusted maximum store temperature is reached,
the system stagnates. If the collector temperature increases
to the adjusted maximum collector temperature (CMX),
the solar pump is activated until the collector temperature
falls below the maximum collector temperature. The store
tempe rature may increase (subordinate active maximum
store temperature), but only up to 95 °C (emergency shut-
down of the store).
OCX:
System cooling option
Adjustment range: OFF ... ON
Factory setting: OFF
4.1.12 Minimum collector function
OCN:
Mimimum collector function
Adjustment range: OFF / ON
Factory setting: OFF
The minimum collector temperature is the minimum
temperature which must be exceeded for the solar pump
(R1) to switch on. The minimum temperature prevents the
pump from being switched on too often at low collector
temperatures. If the temperature falls below the minimum
temperature, (flashing) is shown on the display.
CFR:
Antifreeze temperature
Adjustment range:
-10 ... 10 °C
Factory setting: 4,0 °C
4.1.13 Antifreeze function
OCF:
Antifreeze function
Adjustment range: OFF / ON
Factory setting: OFF
The antifreeze function activates the loading circuit between
the collector and the store when the temperature falls be-
low the adjusted antifreeze temperature. This will protect
the fluid against freezing or coagulating. If the adjusted anti-
freeze temperature is exceeded by 1 °C, the loading circuit
will be deactivated.
Please note:
Since this function uses the limited heat quantity of the store,
the antifreeze function should be used in regions with few
days of temperatures around the freezing point.
4.1.10 Collector emergency shutdown
temperature
If the adjusted collector emergency shutdown temperature
(EM) is exceeded, the controller will switch off the solar
pump (R1) in order to protect the system against overheating
(collector emergency shutdown). The factoring setting is
140 °C but it can be changed within the adjustment range
of 110 ... 200 °C.
(flashing) is displayed.
EM:
Collector emergency shut-
down temperature
Adjustment range:
110 ... 200 °C
Factory setting: 140 °C
If OREC is additionally enabled:
If the store tempe rature is higher than the maximum store
temperature (S MX) and if the collector temperature is at
least 5 K below the store temperature, the solar system
remains activated until the store is cooled down below the
adjusted maximum temperature (S MX) via the collector
and the pipework.
If the system cooling function is enabled,
(flashing) is
shown on the display. Due to the cooling function, the sy-
stem will have a longer operation time on hot summer days
and guarantees thermal relief of the collector field and the
heat transfer fluid.
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