The Asco P302/6 pressure switch (formerly Sirai) is one of the most used 3-phase pressure switches in professional espresso machines. It automatically controls the boiler pressure by switching the heating element on and off at the set point. When the boiler reaches the preset pressure, the membrane opens the electrical circuit, and when pressure drops, heating resumes. Originally produced by Sirai, now branded Asco with the same Italian quality and design.
Technical Specifications
Brand: Asco (formerly Sirai)
Model: P302/6
Poles: 3
Max current: 30 A
Adjustable range: 0.5 ÷ 1.4 bar
Fixed differential: 0.15 (± 0.06) bar
Max fluid temperature: 140 °C
Connection: ISO 228 G 1/4″ M for Ø 4×6 mm pipe
Electrical rating: 220 V → 7 kW (30 A) / 400 V → 12 kW (30 A)
Approvals: CE / SEV / ASE / UL
Made in Italy
How It Works
A spring-loaded membrane senses boiler pressure and mechanically opens or closes the electrical contacts. Once the pressure reaches the set value, the contacts open to cut power to the heating element. When pressure falls, the contacts close again, restarting the heating cycle.
VICTORIA ARDUINO: Adonis, Athena Leva, Athena S, Venus Bar, Venus Century
VISACREM: Brava, Nera
WEGA: Airy, Atlas, Polaris, Start, Venus, Sphera, Nova
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This part is compatible to the original part number. Part numbers are always leading.
Well that answer is pretty simple, no it isn’t. The original valve works as following, when you turn the shaft inwards the valve pin will push a gasket holder. The steam can go out, close it again and no steam can go out. In the case of the modern E61 valves is that behind the gasket holder is a small stainless steel ball with a spring.
From the beginning of the Faema E61 brewing group are basically no differences between the parts installed inside the brewing group. Parts such as the valve gaskets, springs, valve assemblies and portafilters have all remained the same. The biggest change is the small cleaning hole on the front of the brewing group. With the earliest models this hole didn´t exist.
There are 5 types of boiler used on the Faema E61 espresso machine. The most well known is the double flanged model. You have on one side the heating element flange and on the other side the water level flange, both are out of production. These are held in place with aluminium boiler rings. For the single groups you have a boiler with a flange on one side.
The next model is a stainless steel boiler, with one flange. This type of boiler is less common then the copper boiler above. There is also a later model stainless steel, which doesn’t have a removable flange. Both these boilers have corrosion issues, this has to do because of the stainless steel.
The latest model is also a copper boiler, this boiler has a single heat exchanger(HX) in the middle. Most modern espresso machines have for each individual brewing group a individual HX.
Yes it is, but this depends on various factors. The first thing is experience, seen this is a manual operated espresso machine it requires a lot more attention from the barista then a solenoid operated model. There you need to stop the brewing process manually. If you don’t have the experience you probably can’t hold up with the tempo which is required at such a bar. Then I would advice to go for the Faema E61 Jubilee, this is the solenoid operated version of the Faema E61 Legend espresso machine.
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