STIEBEL ELTRON SOM 6 PLUS - Manual (Page 14)

14
Maximum tank temperature 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 sensor 2 exceeds the adjusted
maximum tank temperature, the
symbol is shown on the
display.
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]
Note:
If the collector cooling or the system cooling
function is activated, the adjusted tank temperature
may be overridden. In order to prevent system
damage, the controller is also equipped with a
non-adjustable emergency shutdown if the tank
reaches 200 °F [95 °C].
Collector temperature limitation
Emergency shutdown of the collector 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. While the collector is in
emergency shutdown, (flashing) is shown on the display.
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]
Note:
If the drainback option
ODB is activated,
the adjustment range of EM is changed to
170 ... 250 °F [80 ... 120°C]. The factory setting
in that case is 200 °F [95 °C].
WARNING! Danger of injury and system damage
through pressure surges!
If water is used as a heat transfer
medium in a pressure-less system, the
water will start boiling at 212 °F [100
°C].
Î If a pressure-less drainback system
is used with water as a heat transfer
medium, do not adjust the collector
temperature limitation EM to more
than 200 °F [95 °C]!