STIEBEL ELTRON SOM 7 SI - Manual (Page 17)

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SOM 7 SI
4.1.8 ∆T-regulation
DT O / DT1O / DT2O /
DT3O:
Switch-on temperature
differential
Adjustment range
2.0 - 40.0 °F
Factory setting 12.0
DT F / DT1F / DT2F / DT3F:
Switch-off temperature
differential
Adjustment range
1.0 - 38.0 °F
Factory setting 8.0 °F
4.1.9 Maximum Tank Temperature
S MX / S1MX / S2MX:
Maximum storage tank temp.
Adjustment range: 40 - 205 °F
Factory setting 140 °F
Primarily the controller works in the same way as a standard
differential controller. If the switch-on difference (DT O/
DT1O/DT2O/DT3O) is sensed, the pump is activated.
If the adjusted switch-off temperature is measured (DTF/
DT1F/DT2F/DT3F), the controller switches-off.
Maximum Temperature Limitation
The Maximum Temperature Limitation regulates the
temperatures at which the second differential switch-on
temperature (DT3O) will operate. This feature is only
available if Arr 2 or Arr 8 is selected (for solid fuel boilers
or heat exchange regulation).
If the relavent sensor measures a temperature greater than
MX3O, relay 2 is disabled. Relay 2 will not be enabled
again until a temperature less than MX3F is reached.
Reference sensor:
S3 by Arr 8 (TSTU)
S4 by Arr 2 (TST2)
The Minimum Temperature Limitation also works in
conjunction with the second differential switch-on
temperature (DT3O). If the relavent sensor measures
a temperature less than MN3O, relay 2 will be disabled.
Relay 2 will not be enabled again until a temperature greater
than MN3F is measured. by the relavent sensor.
Reference sensor:
S4 by Arr 8 (TFSB)
S3 by Arr 2 (TSTU)
MX3O / MX3F:
Maximum temperature limi-
tation
Adjustment range
MX3O 137 - 205°F
MX3F 30 - 136°F
Factory settings
MX3O 140°F
MX3F 136°F
4.1.10 ∆T-controller (solid fuel boiler and heat exchange)
Please note: Switch-on temperature difference DT O must
be at least 2 °F higher than the switch-off tempe rature-
difference DT F.
If the adjusted maximum temperature is exceeded, a further
loading of the store is stopped so that a damaging overheating
can be avoided. If the maximum store temperature is
exceeded, the symbol is displayed.
Please note: The controller is equipped with a security-
switch-off of the storage tank, which will not allow further
loading of the tank if it reaches 205 °F.
Minimum Temperature Limitation
MN3O / MN3F:
Minimum Temperature
Limitation
Adjustment range
Arr 2
MN3O 30 - 49°F
MN3F 41 - 195°F
Arr 8
MN3O 30 - 149°F
MN3F 141 - 195°F
Factory settings
Arr 2
MN3O 40°F | MN3F 50°F
Arr 8
MN3O 140°F | MN3F 150°F