STIEBEL ELTRON SOM 7 PLUS, Эксплуатация и установка

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26
∆
T control for backup heating by solid fuel boiler
DT3O:
Switch-on temperature diff.
Adjustment range: 2.0 ... 40.0°Ra
[1.0 ... 20.0 K]
in steps of 1 °Ra [0.5 K]
Factory setting: 12.0°Ra
[6.0 K]
DT3F:
Switch-off temperature diff.
Adjustment range: 1.0 ... 39.0°Ra
[0.5 ... 19.5 K]
in steps of 1 °Ra [0.5 K]
Factory setting: 8.0°Ra
[4.0 K]
Reference sensors for this function are S4 and S3.
In system layout 8, the controller is equipped with an ad-
ditional differential control for heat exchange from a solid
fuel boiler (e.g. woodstove). The basic differential function
is adjusted using the switch-on (
DT3O) and switch-off (DT3F)
temperature differences.
When the switch-on difference is reached, relay 2 switches
on. When the temperature difference falls below the adjusted
switch-off temperature difference, relay 2 switches off.
Note:
The switch-on temperature difference must be
at least 1 °Ra [0.5 K] higher than the switch-off
tempe rature difference.
DT3S:
Nominal temperature difference
Adjustment range: 3.0 ... 60.0 °Ra
[1.5 ... 30.0 K]
in steps of 1 °Ra [0.5 K]
Factory setting: 20.0 °Ra
[10.0 K]
RIS3:
Rise
Adjustment range:
2 ... 40 °Ra
[1 ... 20 K]
in steps of 2 °Ra [1 K]
Factory setting: 4 °Ra [2 K]
Pump speed control
A relative minimum pump speed can be allocated to the
output R2 via the adjustment channel
n2MN.
n2MN:
Pump speed control
Adjustment range: 30 ... 100
in steps of 5 %
Factory setting: 30
Note:
When loads which are not speed-controlled (e.g.
valves) are used, the value must be set to 100 % in
order to deactivate pump speed control.
Minimum pump speed
When the switch-on temperature difference is reached, the
pump is activated at full speed for 10 seconds. Then, the speed
is reduced to the minimum pump speed value (
n2MN).
If the temperature difference reaches the adjusted nominal
temperature difference (
DT3S), the pump speed increases by one
step (10 %). If the difference increases by the adjustable rise value,
the pump speed increases by 10 % respectively until the maximum
pump speed of 100 % is reached. The response of the controller
can be adapted via the parameter
RIS3.
Note:
The nominal temperature difference must be
at least 1 °Ra [0.5 K] higher than the switch-on
tempe rature difference.
Note:
For pump speed control of the solid fuel boiler
pump, the operation mode of relay 2 (
MAN2) must
be set to Auto.
System-specific functions
The following adjustments are used for the specific functions
in system layout 8.