La Spaziale S1 Vivaldi II Owner's Manual

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La Spaziale S1 Vivaldi II Owner's Manual Manual pdf 25 page image

S1 Vivaldi II Owner’s ManualPage 238.3 Group Pressure Test and AdjustmentThis adjustment and the one covered in the next section require that use of a Portafilterwith the rubber disk or blind filter basket. (The same one used for back flushing.) Forclarity the portafilter is not shown in the photo but it MUST be used.Removal of the chrome panel behind the portafilter is required. This is the panelthrough which protrudes the boiler/group pressure gauge. Use a large Phillipsscrewdriver to remove the two screws adjacent to the numbers (5) on the diagram onpage 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 DoubleCup (25) button and wait for the group pressure gauge “D” to stabilize. Most usersprefer group pressure in the range 8.2-9.0 bar. Turning the adjuster nut “B” (10mmwrench) counter-clockwise lowers the pressure, turning it clockwise increases thepressure. 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 thesupply pressure. However, if you add an in-line pressure regulator to the water supplyline this should not be required. If your water supply pressure is higher than 30psi, awater pressure regulator can also reduce or eliminate expansion valve drips.