STIEBEL ELTRON SOM 9s - Manual (Page 79)

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SOM 9s
In the adjustment channel n1(2, 3)LO, a relative minimum
speed for connected pumps can be allocated to the outputs
R1, R2 and R3.
Minimum speed
PUMP1 (2, 3) / n1 (2, 3 LO
Speed control
Adjustment range: 20 ... 100 %
in steps of 5%
Factory setting: 30 %
With this parameter, the pump control type can be adjusted.
The following types can be selected:
Adjustment for standard pump without speed control
• OnOF (pump on / pump off)
Adjustment for standard pump with speed control
• PULS (pulse packet control via semiconductor relay)
Adjustment for high efficiency pump (HE pump)
• PWM A (Wilo)
• PWM b (Grundfos)
• PWM C (Laing)
Pump control
PUMP / PUMP1 (2, 3,)
Pump control
Selection: OnOF, Puls, PWM A,
PWM b, PWM C,
Factory setting: OnOF
Sensor maximum tank temperature Allocation of the sensor for tank maximum limitation. The
maximum limitation always refers to the sensor selected.
If S3 is selected, the differential control will be carried out
using S1 and S2. The temperature at S2 can exceed the
adjusted limit temperature, the system will not switch off.
If the value at S3 reaches the limit temperature, the system
will be switched off.
LOAD(1,2) / S(1,2)MAXS
Sensor tank maximum temp.
Adjustment range:
1-tank system: S2, S3
2-tank system: S4, S5
Factory setting:
1-tank system: S2
2-tank system: S4
note:
In 1-tank systems with sensor S3 as the reference
sensor, loading will be switched off if the tempe-
rature at S2 or S3 reaches the tank emergency
shutdown temperature.
In 2-tank systems, loading will be switched off
if the temperature at S4 or S5 reaches the tank
emergency shutdown temperature.
Loading tank 2
In a 2-tank system, the second tank can be switched off for
loading via the parameter LST2.
If LST2 is adjusted to OFF, the system runs like a 1-tank
system. The representation in the display does not change.
LOAD2 / LST2
Loading tank 2
Selection: ON / OFF
Factory setting: ON
note:
For more information about connecting HE
pumps, see page 68.
note:
When loads which are not speed-controlled (e. g.
valves) are used, the value of the corresponding
relay (n1, n2, n3) must be set to 100% or the
pump control type must be set to OnOF in
order to deactivate pump speed control.
note:
PUMP3 can only be set to OnOf or PULS.
note:
When loads which are not speed-controlled (e. g.
valves) are used, the value of the corresponding
relay (n1, n2, n3) must be set to 100% or the
pump control type must be set to OnOF in
order to deactivate pump speed control.
Maximum speed
PUMP1 (2, 3) / n1 (2, 3) HI
Speed control
Adjustment range: 20 ... 100 %
in steps of 5%
Factory setting: 100 %
In the adjustment channel n1(2, 3)HI, a relative maximum
speed for connected pumps can be allocated to the outputs
R1, R2 and R3.