Panasonic WH-MXF09D3E8 Service Manual page 11

4.1.1 Main Components
Water pump : The pump circulates the water in the water circuit.
Pressure gauge : The manometer allows read out of the water pressure in the water circuit.
Flow switch : The flow switch checks the flow in the water circuit and protects the heat exchanger against
Pressure relief valve : The pressure relief valve prevents excessive water pressure in the water circuit (> 190kPa).
Electric Heater : Additional heating capacity to the system when water and ambient temp is low.
Expansion Vessel : Storage for excessive water.
high pressure built-up and the pump against damage.
11