10.16 Heater Circuit
The water temperature in the heater tank (instant/freshbrew machines)/pressure
boiler (B2C machines) is controlled by a thermistor probe. The thermistor has a
variable resistance; when cold it has a high resistance and when hot it has a low
resistance.
1. The thermistor probe sits directly in the water and continuously senses
the water temperature. The resistance of the thermistor is interpreted by
the controller as a temperature reading.
N.B. The resistance of the thermistor when at ambient (room)
temperature should read about 3000 ohms, when hot (96°C) it should
read approximately 220 ohms.
INPUT/OUTPUT BOARD
(INSTANT & FRESHBREW MACHINES)
HEATER TANK/
PRESSURE BOILER
MAIN CONTROLLER
BOARD
SOLID
STATE
RELAY
N.B. Level Probe and circuit fitted
to Genesis instant and freshbrew
machines only.
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