Control Unit/Heat EXCHANGER
The control unit/heat exchanger includes the:
- control unit
- temperature sensor
- overheat protection
- heat exchanger
- connector terminal
The control unit controls and monitors combustion operation. The control unit is ventilated by means of a ventilation hose routed from the combustion air collector compartment of the burner. The heat exchanger transfers the heat generated by combustion to the coolant circuit. The control unit/heat exchanger and the burner housing are an assembly and must not be disassembled.
The temperature sensor senses the coolant temperature in the heat exchanger as an electrical resistance. This signal is sent to the control unit for processing.
The overheat protection, controlled by the temperature resistor, protects the heater against undue operating temperatures. The overheat protection will switch the heater off if the water temperature exceeds 105°C (221°F).