General Scheme And Operation Principles; Operation Principles - Rinnai Infinity 20 External Operation And Installation Manual

2.5 GENERAL SCHEME AND OPERATION PRINCIPLES

Flue Outlet
Exhaust Duct
Heat Exchanger
Water Thermistor
(Lime Sensor)
Heat Exchanger
Thermal Fuse
(Code Type)
Burner
Combustion Fan
By-pass Mixing
Anti-Frost Heater
Outgoing Water
Thermistor
(TWIN Type)
Pressure Relief
Valve
Water Filter
And Drain

2.5.1 OPERATION PRINCIPLES

Ignition
Press ON/OFF Button of Remote Controller to turn on unit and the remote controller display and priority LED will light
up. When a hot water tap is opened the water flow Sensor revolves and sends a pulse signal to the printed circuit
board (PCB). When the PCB detects water flow it compares the measured temperature to the temperature setpoint.
If required it begins the ignition process with the combustion fan motor starting first. Once the air proving is made the
main solenoid valve and change-over solenoid valves are opened and the burner is lit by the sparking igniter.
Temperature control
Once the flame rod proves ignition the Infinity modulates by controlling the gas rate, combustion air, and water flow to
precisely heat the water. This control is done by measuring the outgoing water temperature with a Thermistor.
Standby
When the hot water tap is closed the PCB no longer receives a pulse signal from the water flow sensor. The PCB shuts
the main solenoid valve and change-over solenoid valves and the burner extinguishes.
Water
Hot Water
Inlet
Outlet
Water Flow Water Flow
Control Device Control Device
Frost Sensing
Thermistor
Water Flow
Sensor
Gas
Over Heat Switch
Flame Rod
Spark
Electrode
Igniter
Solenoid Valve SV2
Solenoid Valve SV1
Modulating Solenoid
Valve
Main Solenoid Valve
P.C.B P.C.B
(INCLUDED 5A FUSES)
Remote Controller
AC230V/50Hz
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