Checking/Calibrating The Opening Pressure For The Expansion Valve - La Spaziale S40 Classic Installation Instructions Manual

40
espresso coffee machines
7.3.2 Checking/Calibrating the opening pressure
for the expansion valve
The following section lists the checks/calibration operations needed for the expan-
sion valve.
With the machine on and at the right temperature, press the delivery buttons of all
groups and after about 5 seconds, connect a portafilter with incorporated pressure
gauge to one of the groups and switch off the delivery of the other groups.
Wait for the water to come out of the portafilter and then tighten it perfectly to the
delivery group.
The pressure gauge on the portafilter will first of all show the pressure of the pump
motor.
The pressure will them increase until it stabilises and the pressure gauge will show the
opening pressure of the expansion valve.
When the expansion valve opens, a series of drops of cold water will come out of the
valve.
To change the opening pressure for the expansion valve, proceed as follows:
1. Remove the drip tray and grating.
1
2
1
Fig. 30
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LSI 024 - Rev. 01 - Ed. 10/2016