Wolf SM2 Installation And Operating Instructions Manual page 34

SOL13 / P13
Variable speed pump control
SOL14 / P14
Start differential solar
cylinder 2
SOL15 / P15
Stop differential solar
cylinder 2
34
Parameter description
With system configurations 1, 2, 4, 6, 8, 9, 10, 11, the solar circuit
pump can be operated with variable speed control.
SOL13 / P13 = 1 → variable speed control enabled
SOL13 / P13 = 0 → variable speed control disabled
Once variable speed control has been enabled, first implement
a new start (power "OFF"/power "ON")
With variable speed control, the speed and consequently the
pump rate of the solar circuit pump is matched to any lowering
of the temperature differential between the collector and the
cylinder temperature. For this, the speed is progressively reduced
from a temperature differential of 35 K down to the selected stop
differential.
dTAus = Stop differential solar cylinder 1
NB Note:
In connection with "High efficiency pumps",
never change the factory setting of parameter
In systems with two cylinders, the start differential for solar
cylinder 2 is selected here.
The function is similar to that of parameter SOL01 / P01 (start
differential solar cylinder 1):
Collector temperature >= Cylinder temperature solar cylinder 2
+ Start differential solar cylinder 2 -> Cylinder heating
Systems with bypass circuit:
Bypass temperature >= Cylinder temperature solar cylinder 2 +
Start differential solar cylinder 2 -> Cylinder heating
The start differential is always held at least 5 K above the stop
differential (start differential >= stop differential + 5 K), even if a
lower value has been entered to safeguard a reliable function.
In systems with two cylinders, the stop differential for solar
cylinder 2 is selected here.
The function is similar to that of parameter SOL02 / P02 (stop
differential solar cylinder 1):
Collector temperature < Cylinder temperature solar cylinder 2 +
Stop differential solar cylinder 2 -> Cylinder heating OFF
Systems with bypass circuit:
Collector temperature < Cylinder temperature solar cylinder 2 +
Stop differential solar cylinder 2 -> Cylinder heating OFF
(factory setting)
Temperature differential
.
SOL13
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