MNP37M03GBV00 Date: 24-11 Rev. 0
Page 17 of 79
Connect the electrical circuit power supply cable to the mains switch and close the
door of the machine so it is turned on.
The machine will automatically carry out an internal check. It will first move the
rotating arm to ensure it is working properly and then leave it in standby position. The
coffee assembly cam position is also checked and if it is not in place, acting on the
relevant micro switch, the cam will move until it is in the correct position to begin the
assembly’s operating cycle. (figure 5.03.2)
It will then check whether there is water in the air-break. Since it is empty, it will
open the water intake solenoid valve and filling will begin. Once the air-break has been
filled, water will begin to pass through the air-break into the pressure boiler, through a
pump located between them. While the boiler is filling up, several things take place:
water continues to go into the air-break because a micro-switch detects that the water
level is coming down. At the same time, a solenoid valve in the boiler opens to prevent
excess pressure in the boiler. Thus, when the boiler is full, water will begin to come out
through the solenoid valve. The valve will remain open for a few seconds so the boiler is
filled correctly.
F
Important: If after this operation water does not come out through the soluble
beaters, this means the pressure boiler has not filled up completely, so it will be
necessary to carry out a manual washing of the machine until water comes out of
the beaters.
Thus, what can mainly be observed is that the solenoid valve that lets water into
the air-break will open as often as necessary, until the air-break control system detects
that the water circuit has reached the required stand-by level.
F
The machine will be left out of service if after 10 minutes the air-break has
not filled up. This may be because the stopcock is not open or because the
emptying tube shutter is not closed and the water is going directly into the waste
bin.
Once this level has been reached, the boiler heating element will begin to heat the
water until it reaches working temperature.
