DeLonghi EC9155 - Working Priciple

Doc. nr.: DSDL_21010_A
[6]
5. WORKING PRINCIPLE
MICROSWITCHES, SENSORS AND ELECTROVALVES
MICROSWITCHES
Function
Logic
MICROSWITCH FILTER HOLDER
Detects when the sump is inserted
In order to start grinding
NO when the sump is NOT inserted
REED
Function
REED SENSOR WATER TANK
Detects when the water level is at
minimum
ELECTROVALVES
Function
EV1 = 2 ways HOT WATER solenoid
valve
Allows the hot water flow going to
the hot water pipe
EV2 = 3 ways STEAM solenoid valve
First allow steam to flow to the
EV3. When steam flow stops close
the way to EV3 and opens the 3
rd
way to discharge residual steam
pressure on the expansion
chamber (then to the drip tray)
EV3 = 3 ways WATER solenoid valve
Allows steam from EV2 to flow up
to the steam pipe