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SCU 123
Maximum tank temperature
S MX:
Maximum tank temp.
Adjustment range:
40 ... 200 °F
[4 ... 95 °C]
in steps of 2 °Ra [1 K]
Factory setting:140 °F [60 °C]
Collector temperature limitation
Emergency shutdown of the collector
EM:
Collector temperature limitation
Adjustment range:
170 ... 390 °F
[80 ... 200 °C]
in steps of 2 °Ra [1 K]
Factory setting: 270 °F [130 °C]
Collector minimum limitation option
OCN:
Collector minimum limitation
Adjustment range: OFF / ON
Factory setting: OFF
CMN:
Minimum collector temp.
Adjustment range:
50 ... 190 °F [10 ... 90 °C]
in steps
of 1 °Ra [0.5 K]
Factory setting:
50 °F [10 °C]
Antifreeze option
OCF:
Antifreeze function
Adjustment range: OFF / ON
Factory setting: OFF
CFRO:
Antifreeze temperature on
Adjustment range:
-40.0 ... +48.0 °F
[-40.0 ... +9.0 °C]
in steps
of 2 °Ra [0.5 K]
Factory setting: 39.0 °F [4.0 °C]
CFRF:
Antifreeze temperature off
Adjustment range:
-38.0 ... +50.0 °F
[-39.0 ... +10.0 °C]
in steps
of 2 °Ra [0.5 K]
Factory setting: 41.0 °F [5.0 °C]
Once the adjusted maximum temperature is exceeded,
the solar pump is switched off and further loading of the
tank is prevented to reduce scald risk or system damage. A
fixed hysteresis of 4 °Ra [2 K] is set for the maximum tank
temperature.
When the temperature at the corresponding sensor exceeds
the adjusted maximum tank temperature, the
shown on the display.
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 20 °Ra
[10 K] is set for the collector temperature limitation. Whi-
le the collector is in emergency shutdown,
shown on the display.
If the collector minimum limitation option is activated, the
pump (R1) is only switched on if the adjustable collector
minimum temperature is exceeded. The minimum tempera-
ture prevents the pump from being switched on too often
at low collector temperatures. A fixed hysteresis of 10 °Ra
[5 °K] is set for this function
If the collector minimum limitation is active,
shown on the display.
The antifreeze function activates both pumps at 100% when
the temperature falls below the adjusted temperature
CFRO. This will protect the fluid against freezing or coagu-
lating. If CFRF is exceeded, the pumps will be switched off.
When the antifreeze function is activated,
the display. If the antifreeze function is active,
Note:
Since this function uses the limited heat quantity
of the tank, the antifreeze function should be
used in regions with few days of temperatures
around the freezing point.
The antifreeze function will be suppressed if
the tank temperature falls below 40 °F [5 °C]
in order to protect the tank from frost damage.
symbol is
(flashing) is
(flashing) is
is shown on
is flashing.
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