User manual for NERO / NERO INSTANT
Page 18
Version 3.2 / December 2017
3.5.8 Flot chamber, pump and boiler
а. Flot chamber
The float chamber (see figures 50 and 51) 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 emp
-
ty. 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 determines 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 vend
-
ing machine to be blocked.
Figure 19
Figure 19:
1. Pin switch of the water level sensor
2. Float
3. Water inlet connector
4. Water outlet to the boiler
b. Boiler feed pump
The boiler heats the water to a certain temperature, which is set
in the configuration menu, for the preparation of hot drinks (see
figure 52).
The boiler is fitted with a feed pump, which maintains permanent
pressure (see figure 10 position 3) and (see figure 20).
Figure 20
1
2
3
4
c. 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 figure 21), according to the selection the hot water flows:
1. For NERO (into espresso group, one of the two mixers, directly into drink disposal nozzle)
2. For NERO INSTANT (into one of the three mixers, directly to the drink disposal nozzle)
ATTENTION: It is strictly prohibited to use water, which does not conform to the given stand-
ards 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.