Sensors And Safety Devices - Rinnai INFINITY 26i Service Manual

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 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
20.6 bar, closes at 14.7 bar.
• 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)
Upper /
Lower
1.00
Natural
1.7
Propane 0.75
1.15
* * The TPP is measured with the cover 'off' the appliance at the regulator test point with supply pressures
of 20 mbar (NG) and 37 mbar (Propane).
Infinity REU-V2632FFU / HD200I REU-V2632FFUC
Infinity 26i and HD50i
Nominal TPP (mbar) * *
Low High
1.9 8.5
2.3
10.8
- 3 -
Gas Input (kW)
Low High
54
4.4
54
4.4
Issue 1 - 8/09/03 ©Rinnai