NECTA SPA TECHNICAL MANUAL “BRIO 250”
Service Manual: Brio 250
Edition 02-2002
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3.1 - BOILERS
In the
Brio Espresso
model there is only one
pressure
type boiler identical to the model used for the Venezia
vending machine and controlled by an air-break and a vibration pump
.
Installed power 1200 W
On the other hand in the
Instant
version there is a specific
open-top
boiler with an incorporated air-break.
Installed power 1600 W
ESPRESSO
INSTANT
See relevant section in the functional unit manual for details, photos and complete description
NOTE *
In both boilers the internal temperature control is by means of a NTC * type electronic probe fitted with an internal 12 K ohm
(± 4 ohm) resistance at a temperature of 25° C.
As the internal temperature increases the resistance is reduced progressively as indicated in the following table.
Boiler temperature °C
Value in ohm
Allowed tolerance
0
35875
± 7 ohm
25
12000
± 4 ohm
50 2900 ,,
85 1475 ,,
90 1260 ,,
100 963
,,
HYDRAULIC DIAGRAMS - ESPRESSO AND INSTANT VERSIONS
3-way solenoid
valve
Safety
thermostat
NTC
Probe
Open-top
boiler
Pressure
boiler
Pump with a by-pass
Open-top
boiler
NTC Probe
Thermostat
2-way solenoid
valves
Pressure
boiler