COFFEtek VITRO S2 Series, Техническое руководство

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VITRO S2/3 Revision 1 28/02/2017 10
WATER SYSTEM
14. The main water supply enters the machine via an inlet valve, which is mounted in the
cabinet base panel. A length of tube then takes the water supply into the top of the water
boiler via an air break into a channel, which is directed, to the bottom of the heater tank.
15. Hot water is dispensed from the boiler, via the appropriate solenoid operated valve, to the
mixing bowl. A length of tube directs any overflow from the boiler via overtemp safety
thermostats to the waste tray.
16. The cold water mains supply enters the machine at the base of the cabinet and connects
with inlet valve, which controls the flow of water to the boiler. The water is maintained at a
constant level in response to signals from a water level probe which is connected to the
Controller Board.
17. The water is heated to the required temperature by a single element. The Controller Board
ensures that the temperature is maintained to a predetermined level by controlling the
supply to the heater in response to signals from the N.T.C. temperature sensor which forms
part of the level/temperature probe assembly.
18. Hot water from the boiler is fed directly to the mixing bowls where it mixes with the
dispensed ingredient to produce the selected beverage. Solenoid operated valves
distribute the hot water to the selected mixing bowl, the amount of water being determined
by the program setting.
19. The temperature of the water is monitored by the Controller Board via a sensor inserted into
the tank, thus causing the supply to the heater to be removed when the water in the boiler
reaches its required temperature setting. If the temperature in the boiler increases causing
the water to boil over, the water will flow over the overtemp sensors which will cut off the
electrical supply to the heating elements. This sensor is mounted on top of the heater tank
and are re-settable.
Heater and Boosting
20. The heating control system employs an intelligent algorithm to obtain maximum
performance as follows:-
Boost operation takes place when the inlet valve opens following a selection being taken. The
heater control algorithm is instructed to turn on the SSR for the duration specified in the
variable CUP BOOST
If the temperature is 3° more than the DESIRED TEMPERATURE, set in the CHANGE
SETTING MENU all boosting operations are disabled.
If the actual temperature is between 0
– 1.5° less than the DESIRED TEMPERATURE the
SSR toggles ON & OFF unless a boost operation is in progress then the SSR are ON.
If the actual temperature is between 2° - & 3° less than the desired temperature the SSR is
ON. Boost operations are as above.
If the actual temperature is more than 3° below the desired temperature the
SSR’s are ON.