STIEBEL ELTRON SOM 9s - Manual (Page 78)

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SOM 9s
6.2 Adjustment channels
Selecting the system
Arr
System
Adjustment range: 1 ... 26
Factory setting: 1
Selection of the appropriate system. Each system has
pre-programmed options and adjustments which can be
activated or changed respectively if necessary. Select the
system first (see chap. 3).
note:
If the controller is commissioned for the first
time, the commissioning menu will start. The
subsequent selection of a new system will reset
all other adjustments to the factory settings.
DT-regulation
LOAD(1, 2) / DT(1, 2) O
Switch-on temperature
difference
Adjustment range: 2.0 ... 90.0 °R
in steps of 1.0 °R
Factory setting: 12.0 °R
LOAD 2) / DT(1, 2,) F
Switch-off temperature
difference
Adjustment range: 1.0 ... 89.0 °R
in steps of 1.0 °R
Factory setting: 8.0 °R
The controller works as a standard differential controller. If
the switch-on difference is reached, the pump is activated.
When the temperature difference reaches or falls below the
adjusted switch-off temperature difference, the respective
relay switches off.
note:
The switch-on temperature difference is blocked
against the switch-off temperature difference by
1 °R. DT O must be at least 1 °R higher than
DT F. The set temperature difference must be
at least 1 °R higher than the switch-on tempe-
rature difference.
LOAD(1, 2) / DT(1, 2,) S
Set temperature difference
Adjustment range: 3.0... 90.0 °R
in steps of 1.0 °R
Factory setting: 20.0 °R
LOAD(1, 2) / RIS(1, 2)
Rise
Adjustment range: 2.0 ... 40 °R
in steps of 2 °R
Factory setting: 4 °R
Speed control
When the switch-on temperature difference is reached, the
pump is activated at 100% speed for 10 s. Then, the speed is
reduced to the minimum pump speed value.
If the temperature difference reaches the adjusted nominal
value (DT S), the pump speed increases by one step (10 %).
The response of the controller can be adapted via the pa-
rameter “Rise”. If the difference increases by the adjustable
rise value RIS, the pump speed increases by 10 % until the
maximum pump speed of 100 % is reached. If, at decreasing
temperatures, the temperature difference decreases by
the adjustable rise value RIS, the pump speed decreases
by 10 %.
note:
To enable speed control, the corresponding re-
lay has to be set to “Auto” (adjustment channel
MAn) and the pump control type has to be set
to Puls, A, b, or C (adjustment channel PUMP).
Maximum tank temperature
If the tank temperature reaches the adjusted maximum
temperature, the tank will no longer be loaded in order to
avoid damage caused by overheating. If the maximum tank
temperature is exceeded, is displayed (flashing).
The corresponding reference sensor can be chosen, see
“Sensor maximum tank temperature”.
Switch-on hysteresis -4K
LOAD(1, 1.2) / S(1,2) MAX
Maximum tank temperature
Adjustment range: 40 ... 200 °F
in steps of 2 °F
Factory setting: 140 °F