Group Pressure Test And Adjustment - La Spaziale S1 Vivaldi II Owner's Manual

S1 Vivaldi II Owner's Manual

7.3 Group Pressure Test and Adjustment

This adjustment and the one covered in the next section require that use of a Portafilter
with the rubber disk or blind filter basket. (The same one used for back flushing.) For
clarity the portafilter is not shown in the photo but it MUST be used.
Removal of the chrome panel behind the port afilter is required. This is the panel
through which protrudes the boiler/group pressure gauge. Use a large Phillips
screwdriver to remove the two screws adjacent to the numbers (5) on the diagram on
page 2. Then remove the panel. Attach the portafilter with rubber disk or blind basket.
The adjustment screws are designated by the letters "A" and "B" in the diagram below.
First, loosen the lock nut "A" (14mm wrench). Press the Single Cup (24) or Double
Cup (25) button and wait for the group pressure gauge "D" to stabilize. Most users
prefer group pressure in the range 8.2-9.0 bar. Turning the adjuster nut "B" (10mm
wrench) counter-clockwise lowers the pressure, turning it clockwise increases the
pressure. When it is set to your preferred pressure, tighten the lock nut and recheck .
Then reattach the front panel. Should your water supply pressure change significantly,
readjustment will be required as the rotary pump supplies an adjustable boost to the
supply pressure. However, if you add an in-line pressure regulator to the water supply
line this should not be required. If your water supply pressure is higher than 30psi, a
water pressure regulator can also reduce or eliminate expansion valve drips.
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