Danfoss ECL Comfort 210 Operating Manual page 10

Operating Guide ECL Comfort 210 / 310, application A231 / A331
Application A331.1 in general:
The circulation pumps P1 and P2 work in shift according to a
schedule. One pump is used as spare pump and the other pump
is working. In case of malfunction (missing differential pressure)
of one pump, the other pump will take over. An alarm will be
generated and the defective pump can be inspected / repaired.
Alarm (relay 6) can be activated if:
• The actual flow temperature differs from the desired flow
temperature.
• The activated circulation pump does not generate a pressure
difference.
• The refill water function does not generate a pressure within
a preset time.
• The universal alarm inputs S9 is activated.
Modbus communication to a SCADA system can be established.
M-bus communication enables connection to flow or energy meter.
The controller can limit the flow or energy to a set maximum but
also in relation to the outdoor temperature.
Furthermore, the M-bus data can be transferred to the Modbus
communication.
10 | © Danfoss | 2017.11
Typical A331.1 application:
VI.LG.P2.02