Danfoss ECL Comfort 210 Operating Manual page 8

Operating Guide ECL Comfort 210 / 310, application A231 / A331
Application A231.2 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 4) 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.
8 | © Danfoss | 2017.11
Typical A231.2 application:
VI.LG.P2.02