WATER SYSTEM
25. The cold-water mains supply enters the machine via a double-solenoid operated inlet valve
at the rear of the cabinet. This valve controls the flow of water to the unit’s hot water tank.
If an optional cold drink system is fitted, a separate inlet valve is used to connect it to the
mains water supply. In this eventuality a special ‘Y’ shaped mains water supply hose is
required.
26. Fitted to the mains water line to the vending machine should be an appropriate water
blocker.
HOT WATER SYSTEM
27. Water is supplied via the Hot Inlet valve to the heater tank where it is heated to the required
temperature by a heating element in the tank. Water temperature is controlled by a
combined temperature and level probe assembly in the tank which causes the supply to the
heater to be removed when the pre-set temperature is reached. The probe assembly also
acts as a level sensor, causing the Hot Inlet valve to open when the water in the tank falls
below a pre-set level. The probe (i.e. the input device) is monitored by the Controller
Board, and the water heater and Hot Inlet valve (i.e. the output devices) are controlled by
the DC RIO Board in response to signals from the Controller Board.
28. Depending on the type of hot drink selected, hot water from the heater tank is fed via
solenoid operated dispense valves to the appropriate mixing bowl or Brewer Unit container.
Ingredients and water are mixed in exact quantities in the mixing bowl and then directed to
the dispense head. Similarly, water and ingredient are brewed in exact amounts in the
Brewer Unit and then directed to the dispense head.
29. The resettable cut-out sensor(s), mounted on the boiler overfill tube, cuts off the electrical
supply to the tank heater circuit if the water in the tank starts to boil. Additionally, if the fluid
level in the overflow waste bucket rises above a pre-set level, it is detected by a level probe
and reported to the Controller Board, which responds by closing the inlet valve via the DC
RIO Board and rendering the machine inoperable.
COLD WATER SYSTEM
30. Water is supplied from the Cold Inlet valve to the chiller or carbonator unit (if fitted) via a
pressure regulator. The chiller / carbonator provides either cold still water or cold
carbonated water (carbonator only). The selected type of water (still or carbonated) is
controlled by solenoid operated dispense valves. Flavoured syrup, if available, is added to
the drink by means of oscillating pumps.
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