Danfoss EV210B How To Use Manual page 30

Fault location
Symptom:
Probable cause
Hum
Water hammer when valve opens
Water hammer when valve closes
Differential pressure too high
and/or pulsation in pressure
line
1) See "Spare parts"
28
Solenoid valve sounds wrong
Remedy
Hum caused by ac frequency. Can be removed by chang-
ing to coil with rectifier (see page 21).
See "Installation"
Check valve data and differential pressure.
Check pressure and liquid flow.
Replace with more suitable valve.
Check rest of installation.
IC.PS.600.A4.02 / 520B2809 IC.PS.600.A4.02 / 520B2809