5.5 Flow / power limit
Heating circuit
A flow or energy meter can be connected to the ECL controller in
order to limit the flow or consumed power. The signal from the
flow or energy meter is a pulse signal.
When the application runs in an ECL Comfort 296 / 310 controller,
the flow / power signal can be obtained from a flow / energy meter
via the M-bus connection.
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.
X
= Outdoor temperature
Y
= Limitation, flow or power
# X1 # = High T out (1x119)
# X2 # = Low T out (1x118)
# Y1# = Low limit (1x117)
# Y2# = High limit (1x116)
X
=
Time
Y
=
Flow or power
# 1 # =
Flow or power limit
# 2 # =
Actual flow or energy
# 3 # =
Desired flow temperature
VI.LG.H4.02
© Danfoss | 2017.05 | 77
Operating Guide ECL Comfort 210/296/310, application A230