Rinnai HD250E REU-V3232WC, Service Manual

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Infinity REU-V3232W / HD250E REU-V3232WC - 3 - Issue 1 - 8/09/03 ©Rinnai
Sensors and Safety Devices
• Heat Exchanger Thermistor: Measures hot water temperature at heat exchanger outlet. If water
temperature reaches a predetermined limit, gas supply is stopped.
• 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 97 C for a number of seconds.
• Fusible Link: Situated on the heat exchanger, electrical power supply is stopped if the temperature
exceeds 129 C.
• Water Pressure Relief Valve: Safeguards the water circuit against excessive inlet pressure. Opens at
2100kPa, closes at 1500kPa.
• 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
* * The TPP is measured with the cover ‘off’ the appliance at the regulator test point with supply pressures
of 1.13 kPa (NG) and 2.75 kPa (Propane).
* * * Value for New Zealand LPG
Gas Type Injector
Size (mm)
Nominal TPP (kPa) * * Gas Input (MJ/hr)
Low High Low High
Natural
1.05
0.18 0.74 20 250
1.65
Propane
( NZ LPG )
0.65
0.35
1.76
( 1.53 ) * * *
20 250
0.95
°
°