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Rinnai Continuum Series User Manual

Rinnai Continuum Series
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Continuum and Integrity
REU2532-FFU and REU2532-FFU-C
Series Water Heaters
SERVICE MANUAL
Rinnai Corporation
103 International Drive
Peachtree City, Ga. 30269
Telephone number (800)621-9419
No portion or part of this manual may be copied without prior permission from Rinnai Corporation.
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Rinnai Continuum Series Specifications

General IconGeneral
TypeTankless
Fuel TypeNatural Gas or Propane
Maximum Water Pressure150 PSI
InstallationIndoor or Outdoor
Maximum BTU Input199, 000 BTU/hr
Electrical Requirements120V
Warranty5 years parts, 1 year labor

Summary

Rinnai Continuum Water Heater Features

Installation Guidelines

Remote Control Systems

Safety Devices and Protection

Flame Failure Protection

Monitors combustion process via flame rod and compares signals for safety.

Over Heat Protection Device

Shuts off gas supply if heat exchanger temperature reaches 194°F.

No Water Flow Protection

Ceases gas flow if water flow sensor fails to send magnetic pulse signal.

Thermal Fuse Protection

Breaks circuit and shuts off power if heat exchanger burns out or exceeds 264°F.

Automatic Frost Protection

Activates anti-frost heaters to prevent freezing below 37°F.

5°F Over Temperature Cut-Off

Automatically shuts off burner if output water temperature exceeds pre-set by 5°F.

DIP SWITCH Configuration Settings

Main Components Identification

Error Messages and Troubleshooting

Error 10: Air Supply/Exhaust Blockage

Checks vent components, blockages, and Rinnai venting materials.

Error 11: No Ignition

Verifies gas supply, type, pressure, and igniter operation.

Error 12: Flame Failure

Inspects flame rod, gas lines, and solenoid valves for proper function.

Error 14: Thermal Fuse Issue

Checks manifold gas pressure, heat exchanger integrity, and safety circuit.

Error 16: Over Temperature Warning

Examines airflow, circulating systems, and foreign materials in exhaust.

Error 32: Outgoing Water Temp Sensor Faulty

Checks sensor wiring, resistance, and cleans scale from the sensor.

Error 33: Heat Exchanger Outgoing Temp Sensor Faulty

Verifies sensor wiring, resistance, and cleans scale from the sensor.

Error 34: Combustion Air Temp Sensor Faulty

Checks sensor wiring, resistance, and fan motor condition.

Error 52: Modulating Solenoid Valve Abnormal

Inspects solenoid valve wiring, resistance, and fan motor operation.

Error 61: Combustion Fan Failure

Checks fan motor wiring, resistance, and connection integrity.

Error 71: Solenoid Valve Circuit Faulty

Examines solenoid valve wiring, connections, and resistance.

Error 72: Flame Sensing Device Faulty

Checks microamps from flame rod, carbon buildup, and wiring.

Diagnostic Points for Troubleshooting

Electrical Component Analysis Procedures

Fuse Check Procedure

Inspects and measures resistance of the 3-amp glass fuse.

Transformer Check Procedure

Measures voltage and resistance at the main transformer.

Water Flow Sensor Check Procedure

Measures voltage and resistance at the sensor and PCB connector.

Flame Rod Check Procedure

Measures resistance and checks for carbon buildup or loose attachment.

Combustion Fan Motor Check Procedure

Measures motor voltage, fan rotation sensor voltage, and speed.

Sparker Module Check Procedure

Checks voltage at the sparker and resistance between its terminals.

Gas Solenoid Valve (SV0) Check Procedure

Measures resistance and voltage at the main gas solenoid valve.

Change Over Solenoid (SV1) Check Procedure

Checks resistance and voltage at the change over solenoid valve.

Change Over Solenoid (SV2) Check Procedure

Measures resistance and voltage at the change over solenoid valve.

Change Over Solenoid (SV3) Check Procedure

Checks resistance and voltage at the change over solenoid valve.

Thermal Fuse Check Procedure

Measures resistance of thermal fuses and checks bi-metal switch.

Water Temperature Thermistor Check Procedure

Measures thermistor resistance against temperature charts.

Gas Pressure Setting Procedure

Dismantling for Service Procedures

Serviceman's Troubleshooting Information

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