Rinnai REU-K2430WG Service Manual page 7

Sensors and Safety Functions
• Hot Water Delivery Thermistor: Measures hot water temperature at the outlet valve (i.e. the
'mixed' temperature).
• Flame Rod: Monitors combustion characteristics inside the combustion chamber. If the flame fails,
gas supply is stopped.
• Overheat Switch: Situated on the heat exchanger, gas supply is stopped when water temperature
reaches 97ºC for a number of seconds.
• Fusible Link: Situated on the heat exchanger, electrical power supply is stopped if the temperature
exceeds 129ºC.
• Water Pressure Relief Valve: Safeguards the water circuit against excessive inlet pressure. Opens
at 2060 kPa, closes at 1470 kPa.
• Electrical Fuse: (3A glass fuse) prevents against over-current.
• Surge Protector: prevents against over-current.
• Boil Dry Prevention: If water flow sensor detects no flow, gas supply is stopped.
• Combustion Fan Speed Sensor: In case of combustion fan defect (no rotation of fan) gas supply is
stopped.
• Temperature Cutout: If the delivered hot water temperature rises above the required delivery
temperature for a number of seconds, the gas supply is stopped.
Combustion Specifications
Refer dataplate on appliance
REU-K2430WG-AK (Envirosmart ) - 3 - Issue 1 - 16/12/09 ©Rinnai