NW Global Vending – TECHNICAL MANUAL
This document was produced by MARK AC for the exclusive use of the technical personnel in the after-sales service.
. No part of this document may be divulged to a third party or reproduced partially or entirely without the prior permission of NW GLOBAL VENDING
. All rights reserved.
New dispenser “KORO” 07/10/2005 page 24 / 42
19 – AIR-BREAK & BOILERS
In the currently coded versions the use of an air-break is not planned; in the instant and fresh brewer versions the
open-top boiler is used, which is equipped with a level control system and therefore the relevant functions are
incorporated in the boiler (see next paragraph).
In the espresso versions an internal water supply tank is used, having the functions of the air-break.
There will be in any case some versions with water supply from the mains, where an air-break will be fitted;
therefore the proper documentation will be supplied later.
The air-break is a functional unit that has the function of keeping the water level constant and to have signal
indicating the lack of water from the mains, and in such event it allows the completion of the current selection.
Furthermore (in the espresso version) it serves the purpose of have a water reserve at atmospheric pressure, so
that the pump can draw the water dose needed for the selection and send it to the espresso boiler without pressure
changes that may affect the volumetric counter reading.
The water level is ensured by a float that triggers a microswitch, keeping the level between a factory set minimum
and maximum (it very important not to replace the microswitch with any one of different mechanical
characteristics, as a variety of malfunctions may occur).
Furthermore, in the event of failure to the maximum level microswitch, an overflow hole allows the water to be
conveyed through a tube and to the safety device fitted on the water inlet solenoid valve, thus causing its
mechanical lock (such safety device is triggered also in the event of a power failure).
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