Flow / Power Limit - Danfoss ECL Comfort 210 Installation Manual

Installation Guide

5.4 Flow / power limit

A flow or heat meter can be connected to the ECL controller in
order to limit the flow or consumed power. The signal from the
flow or heat meter is a pulse signal.
The flow / power limitation can be based on the outdoor
temperature. Typically, in district heating systems a higher flow or
power is accepted at lower outdoor temperatures.
The relationship between the flow or power limits and the outdoor
temperature is set in two coordinates.
The outdoor temperature coordinates are set in 'High T out X1'
and 'Low T out X2'.
The flow or power coordinates are set in 'Low limit Y1' and 'High
limit Y2'. Based on these settings, the controller calculates the
limitation value.
When the flow / power gets higher than the calculated limit, the
controller gradually reduces the desired flow temperature to obtain
an acceptable max. flow or power consumption.
Actual (actual flow or power)
Circuit
1
The value is the actual flow or power based on the signal from flow / heat
meter, converted in the controller.
Limit (limitation value)
Circuit
1
The value is the calculated limitation value.
High T out X1 (flow / power limitation, high limit, X-axis)
Circuit
1
Set the outdoor temperature for the low flow / power limitation.
The corresponding Y coordinate is set in 'Low limit Y1'.
54 DEN-SMT/DK
ECL Comfort 210, application A230
11110
Factory setting
Setting range
Read-out only
11111
Setting range Factory setting
Read-out only
11119
Setting range Factory setting
-60 ... 20 °C 15 °C
Flow / power limitation
High limit Y2
Low limit Y1
-15
Low T out X2 High T out X1
Flow / power
limitation
Desired flow
temp.
If the 'Adapt. time' is too high, there is a risk of unstable control.
VI.LG.H1.02
Outdoor temp.
° C
15
Limit
Time
Danfoss District Energy