Noritz NR50-OD - Operating Principle Schematics; NR50-OD, NR66;N-0531 S, NR71;N-0631 S Series Operation Flow

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5. Operating Principle
Fixture
Flow Control Valve
Water Filter
Impeller
Primary Gas Valve
Fan Motor
Rotational
Ignition Electrode
Burner
Circuit Board
AC120V
Igniter
Thermal Fuse
Exhaust
High-Limit Switch
Air Supply
Flame Rod
Anti-Frost Heater
(Optional for NR50-OD)
Heat Exchanger
Valve
Sensor
Outlet
Valve 1
Inlet
Transformer
(NR71-SV/N-0631S only)
Switch (Optional for NR50-OD)
Drain Valve
Frequency
Sensor
Thermistor
Thermistor
Water
Drain Valve
Water
Water Flow
Frost Sensing
Proportioning
Gas
Gas Solenoid
Gas Solenoid
Valve 2
G.F.C.I.
Exhaust
Hot Water
Hot Water Supply
Cold Water Supply
Gas Supply
NR66-SV/N-0531S,
NR71-SV/N-0631S
NR66-OD/N-0531S-OD,
NR71-OD/N-0631S-OD
NR50-OD
Frost Sensing Switch
NR50-OD
NR66 (-SV,-OD) / N-0531S (-OD),
NR71 (-SV,-OD) / N-0631S (-OD)