Heater And Ntc-Sensor - Bosch TCA640 Series Repair Instruction

4.1.2 Connection diagram
The flowmeter itself does not supply an output voltage but simply
switches the signal connection to 0 volt earth (actuated) or leaves it
open (unactuated). Square pulses are generated in the upper
section of the housing via the Hall-IC.
Wrong connection of + voltage, signal and earth destroys the
flowmeter.
Prevent inductive faults via the cable!
Do not lay the cable together with supply cables to
consumers.
58300000120060_ARA_en_c.doc – 18.09.09
4.2

Heater and NTC-sensor

4.2.1 Heater (Instantaneous water heater)
In the instantaneous water heater the water for coffee production or
hot water/steam purchase is heated up.
Therefore the water is pumped in a stainless-steel pipe (A), which is
cast in together with a heating resistor (B) in an aluminum block.
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