NW Global Vending – TECHNICAL MANUAL
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New dispenser “KORO”
07/10/2005
page 26 / 42
OPEN-TOP BOILER
Boiler temperature °C
Value in ohm
Allowed tolerance
0
35875
+/-7 ohm
25
12000
+/- 4 ohm
50
2900
,,
85
1475
,,
90
1260
,,
100
963
,,
TERMOSTATO
CALDAIA
NOTE:
The open-top is made of special thermoplastic material and coated with insulating material for more efficient heat
insulation;
two
overheating protections are fitted for safety.
1)
Dry operation protection.
2)
Anti-boiling protection.
In the event of failure to the control system and boiler without water, thermostat
1
is triggered at approximately 125°C and
disconnects the power supply; in order to reactivate everything the malfunction must be identified and the thermostat must be
reset by pressing the central red button.
In the event of failure to the control system and the boiler full, upon reaching boiling temperature, as the steam exits from tube
A
it touches and triggers the two thermostats 2.
Proceed as above to reset them; see specific chapter to identify the type of malfunction. See relevant section in the functional unit
manual for details, photos and complete description:
BOILERS
The internal temperature control (in both boilers) is by means of an NTC type electronic probe fitted with an internal 12K ohm (±
4 ohm) resistance at a temperature of 25°C.
S
IDE VIEW WITHOUT PROTECTIVE CASING
–
OPEN
-
TOP BOILER COMPARTMENT
OPEN-TOP BOILER
O
PEN
-
TOP BOILER
–
DETAIL OF SOLENOID VALVES AND OVERHEATING PROTECTIONS
