N & W Global Vending – TECHNI CAL MANUAL
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All rights reserved. No part of this document may be divulged to a third party or reproduced partially or entirely w ithout the prior permission of N & W GLOBAL
VENDI NG
“KORI NTO FB”
23/ 08/ 06
Page 24 / 38
The air-break is a functional unit with the function of keeping the water level constant and of signalling a water flow
interruption from the mains; in the event of such water failure it serves the purpose of completing the current selection.
I n the I nstant and FB version the air-break is incorporated in the boiler.
For the
KORI NTO I nstant
version only the open-top instant boiler is used, fitted with a new design level control
system already used in the KORO model.
For the
Fresh brew er
model, the same open-top instant boiler used in the I nstant version is adopted.
The open-top boiler for the I nstant / FB version is a new and specific design with the feature of being molded from
thermoplastic material with specific technical characteristics. For further technical information see the functional unit
manuals.
OPEN- TOP BOI LERS ( I nstant & Fresh Brew er models)
16 – AI R- BREAK AND BOI LERS
NOTE:
The open-top is made of special thermoplastic material and coated with insulating material for more efficient heat
insulation;
tw o
overheating protections are fitted for safety.
(practically it is the same boiler used in the
KORO
instant model).
1) Dry operation protection.
2) Anti- boiling protection.
I n the event of failure to the control system and of boiler without water, the thermostat
T
is triggered at approximately
125
° C,
disconnecting the power supply. I n order to reactivate everything, the fault must be identified and the thermostat must be
reset by pressing the central red button.
I n the event of failure to the control system and of a full boiler, upon reaching boiling temperature, as the steam exits from
tube
A
it touches and triggers the two thermostats
T2
(each thermostat disconnects one phase of the power supply).
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:
BOI LERS
The internal temperature control is by means of an
NTC
type electronic probe fitted with an internal 12K ohm (+ / - 4 ohm)
resistance at a temperature of
25
° C. The following table shows the changes in internal resistance as the temperature
changes.
We can see that the resistance decreases as the
NTC
temperature increases
The SW, when reading such changes, causes the activation or deactivation of the heating element with a specific cycle to avoid
temperature changes that are too high.
SI DE VI EW WI THOUT PROTECTI VE CASI NG
– OPEN- TOP BOI LER COMPARTMENT
O
PEN
-
TOP BOI LER
OPEN- TOP BOI LER – DETAI L OF
SOLENOI D VALVES AND
OVERHEATI NG PROTECTI ONS
T1
T2
A
