18
5.3
Inlet valve
The inlet valve is controlled by the level sensor in the
boiler and is switched on during a dispense of hot water
to the brewer or mixer. The inlet valve is a 24V DC
valve. The inlet valve contains a backflow protection.
This backflow protection is preventing that water is
flowing back into the water supply.
Electrical connections/wire colors:
Number Wire color
function
1
Orange
Common (+24V)
2
Orange-green
Output (0)
5.4
Pressure reducer
The pressure reducer reduces the water pressure to a stable pressure
independent from the inlet pressure from the mains water supply.
The required inlet pressure from the water supply is between 1,0 and 6 bar.
The pressure reducer is adjusted to an outlet pressure of about 0,8 - 0,9 bar
during an espresso cycle.
The input and output tube to the reducer must
be connected in the right direction, the reducer
works incorrectly in the reversed mode.
There is an arrow on the side of the reducer
indicating the correct water flow direction.
The reducer contains a backflow protection. This
backflow protection prevents the possibility that
water from the machine is flowing back into the
main water supply.
Summary of Contents for COEX 9CND SERIES
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