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Bella Barista
Nene Court, The Embankment,Wellingborough, Northants, NN8 1LD
Tel: 01933 273275
e-mail: claudettep@towability.com
© Bella Barista Page 9 of 11
How it works
. The diagram shows a simplified HX machine. The pump keeps the boiler about 60% filled
with water that is heated and kept at a pressure of 1.3-1.4 bar (about 22 psi). The
temperature of this water is above boiling point and has an area of steam above (similar to a
pressure
cooker).
Steam - The pipe for the steam wand is at the top of the boiler (in the steam area) as the
steam tap is opened, steam is forced through the steam pipe and as the pressure drops more
of the water instantly flashes to steam, giving a continuous supply.
Hot Water - The pipe for the hot water tap is at the bottom of the boiler. As the hot water tap
is opened, steam pressure forces the hot water from the boiler through the pipe and out of the
hot water outlet.
Coffee Brew Water
Coffee brew water for the group does not actually come from the water in the boiler, but is
pumped directly from the tank through a “heat exchanger” (essentially, a big copper tube) that
passes through the hot boiler. As the cold water from the water tank passes through this tube
it is heated to the correct temperature for brewing coffee.
Operating the switch on the front panel controls the pumping of brew water, land an electronic
3 way solenoid valve controls the release of pressure (all 140 psi of it) from the group head,
so you can remove the filter handle safely when you have completed the shot (the excess
water goes into the drip tray when pressure is released).
Group with
Filter handle
9


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