User manual for NERO TOUCH, NERO TOUCH INSTANT
page 33
Version 1.1 / December 2017
ТМ
5.8 flot chamber, boiler pump, boiler and steam boiler
Fig.5.9
1. Pin switch of the water level sensor
2. Float
3. Water inlet connector
4. Water outlet to the boiler
Boiler pump
Fig.5.10
1
2
3
4
The boiler’s electromagnetic valves
During drink preparation, the hot water enters through one of the four electromagnetic valves, located
on top of the boiler (see fig.5.11), according to the selection the hot water flows:
1. into espresso group, one of the two mixers, directly into drink disposal nozzle
(not-INSTANT).
2. into one of the three mixers, directly to the drink disposal nozzle
(INSTANT).
It is strictly prohibited to use water, which does not conform to the given standards of
hardness and calcium content (see the vending machine’s technical features). This can
cause rapid deterioration and failure of the machine’s electromagnetic valves!
The water for the preparation of drinks is supplied by the following group of
devices: boiler, which heats the water; boiler pump, which pumps the water
into the hydraulic circuit; float chamber, which helps avoid air bubbles and
blocks from entering the hydraulic system.
flot chamber
The float chamber (see fig.5.9) retains the minimum required quantity of
water, which is necessary to keep the hydraulic system alive and to ensure the
dispensing of drinks, in case the water supply runs dry.
Equipped with a sensor it determines the state of the chamber: filled or
empty. During the functioning of the internal pump, the water level gradually
falls inside the float chamber until reaching the set level, where the sensor
reads as if the chamber is empty. At this moment the water from external
source (the valve is opened) or internal source (the autonomous mode pump
turns ON) starts filling the float chamber, until the water level sensor deter
-
mines that the chamber was full. This also forms a permanent water lock. In
case of shut down of external water supply or depletion of water in the internal
source, the float chamber will not be filled within the set time interval, which
will cause the vending machine to be blocked.
