This way it is possible to know and understand if
there are problems in the relay or in the probe.
Example:
1 The probe does not read values, but the
boiler/group is active: The problem is with
the probe.
2 The relay is active but the corresponding
boiler/group does not heat up: problems
with the heating elements.
3 A group requires manual reset: the relay for
that group is pasted in ON status.
The static relays in fact can be damaged in ON or
OFF status thereby giving rise to disruptions that
are easy to understand thanks to the lights that
identify the operation.
In the machine with 3 groups each phase is
intended to supply a group independently. Each
phase feeds both a group and the corresponding
coffee boiler.
The relays are powered by starting from the
relays of the steam boiler heating elements.
The groups/coffee boilers relays are driven by
addresses managed with flat cables that go from
the data collector to the relay block. Each cable
can manage 2 coffee boilers and 2 groups, there-
fore the 3 groups machine will have two cables.
NOTE
The blocks are not invertible in any way since
addressed individually. If one of the relays has
jumped the entire set of 4 relays must be replaced.
Edition 01 of 08/2017
8.9
SERVICE MANUAL
Fig. 282
Fig. 281
Fig. 283
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