Working Priciple - DeLonghi EC9155 Service Manual

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