Danfoss L66 Betriebsanweisung PDF herunterladen (Seite 24)

The grey

side of the

ECL Card

Extended service

The grey

side of the

ECL Card

Extended service

Service parameter(s) 31-34 Service parameter(s) 35

32h 32i

31 Return temperature limitation - upper limit (X-axis)

Circuit Setting range Factory setting

I -60 ... 20 °C 15 °C

Set the outdoor temperature value (see drawing).

Set the outdoor temperature value (X coordinate)

for the upper limit.

(The corresponding Y coordinate is set in line 32).

32 Return temperature limitation - upper limit (Y-axis)

Circuit Setting range Factory setting

I 10 ... 110 °C 40 °C

Set the return temperature limitation referring to the outdoor

temperature value set in line 31 (see drawing).

Set the return temperature (Y coordinate) for the

upper limit.

(The corresponding X coordinate is set in line 31).

33 Return temperature limitation - lower limit (X-axis)

Circuit Setting range Factory setting

I -60 ... 20 °C -15 °C

Set the outdoor temperature value (see drawing).

Set the outdoor temperature value (X coordinate)

for the lower limit.

(The corresponding Y coordinate is set in line 34).

34 Return temperature limitation - lower limit (Y-axis)

Circuit Setting range Factory setting

I 10 ... 110 °C 60 °C

Set the return temperature limitation (see drawing).

Set the return temperature (Y coordinate) for the

lower limit.

(The corresponding X coordinate is set in line 33).

35 Return temperature inﬂuence - max. limitation

Circuit Setting range Factory setting

I / II -9.9 ... 0 ... 9.9 -2.0 / -2.0

Set the inﬂuence from the return temperature on the desired ﬂow

temperature.

Set the inﬂuence of the max. return temperature

limitation (set in line 30 or lines 31-34).

Inﬂuence higher than 0:

The desired ﬂow temperature is increased, when

the return temperature gets higher than the set

limit.

Inﬂuence lower than 0:

The desired ﬂow temperature is decreased, when

the return temperature gets higher than the set

limit.

Inﬂuence

Max. limitation > 0

Return limit

Return temp.

Max. limitation < 0

Example

The return limit is active from 50 °C.

The inﬂuence is set to -2.0.

The actual return temperature is 2 degrees too high.

Result:

The desired ﬂow temperature is changed by -2.0 x 2 = -4 degrees.

Normally, the setting in line 35 is lower than 0 in district heating

systems to avoid a too high return temperature.

Typically, the setting in line 35 is 0 in boiler systems because a

higher return temperature is acceptable (see also line 36).

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