Rinnai INFINITY REU-3203W Service Manual page 8

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
Gas Type Injector
Size (mm)
1.05
Natural
1.65
Propane 0.65
0.95
( NZ LPG )
* * The TPP is measured with the cover off the appliance at the regulator test point with supply pressures of
1.13kPa (NG) and 2.75kPa(Propane).
* * * Value for New Zealand LPG
Infinity REU-3203W
°
Nominal TPP (kPa) * *
Low
0.18
0.35
- 3 -
NGC (MJ/hr)
High Low
0.74 20
1.76
20
( 1.53 ) * * *
High
250
250
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