Rinnai Evolve 1252 Service Manual
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Models:
Evolve 952 / 1252
Service manual
RHFE952ETRN / RHFE952ETRL
RHFE1252ETRN / RHFE1252ETRL

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Table of Contents
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Summarization of Contents

Specification Overview
Specification Summary
Describes key technical parameters of the appliance.
Installation & Suitability
Details ideal environments, installation notes, and flue.
Gas & Electrical
Information on gas connection, power supply, and consumption.
Ignition & Safety
Describes ignition system and safety devices.
Temperature Control
Methods for controlling heat output.
Dimensions
Evolve 952 Dimensions
Diagram and measurements for the 952 model.
Evolve 1252 Dimensions
Diagram and measurements for the 1252 model.
Operation Principles
General Notes About Ignition
Details on the ignition process and initial operation.
Fan Forced Convection Heating System
Description of air circulation and heat distribution.
Electrical
Specifications for the power cord and plug.
Ignition
Details on the electronic spark ignition system.
Combustion Fan
Description of the fan's operation and control.
Componentry
Construction Overview
General description of the appliance construction.
Secondary Air Inlet
Description of the secondary air intake component.
Combustion Chamber
Description of the sealed combustion chamber.
Heat Exchanger
Details on the heat exchanger components.
Gas Control and Burner
Description of the gas control and burner assembly.
Regulator
Information on the pressure regulator.
Piping
Details on the gas piping system.
Gas Control
Description of the gas control unit and solenoids.
Burner
Technical details of the ribbon-type burner.
Electronic Ignition
Description of the spark ignition system.
Pressure Test Points
Locations for gas pressure testing.
Time Charts
Normal Operation Natural Gas
Time chart for normal operation with natural gas.
Normal Operation LPG
Time chart for normal operation with LPG.
Abnormal Operation (C)
Time chart for abnormal operation (mis-fire, spark catch).
Abnormal Operation (D)
Time chart for abnormal operation (flame, temp, power).
Retrieving and Clearing Error Codes
How to Retrieve Error Codes
Steps to view stored error codes and operating data.
How to Clear Error Code History
Procedure to erase stored error codes and data.
Commissioning Instructions
PCB Commissioning Steps
Procedure for setting up the control PCB.
Gas Pressure Setting
Checking Supply Pressure
Verifying incoming gas pressure.
Setting the Pilot Pressure
Adjusting pilot flame pressure.
Setting the Operating Pressure
Adjusting main burner pressures.
Dismantling for Service
Removal of Front Panel
Steps to remove the front panel.
Removal of Combustion Chamber Glass
Steps to remove the glass assembly.
Removal of Burners
Steps to remove the burners.
Removal of Pilot Flame Rod
Steps to remove the pilot flame rod.
Removal of Spark Ignitor Electrode
Steps to remove the spark ignitor.
Removal of Main Burner Flame Rod
Steps to remove the main burner flame rod.
Removal of Transformer
Steps to remove the transformer.
Removal of Combustion Fan
Steps to remove the combustion fan.
Removal of Convection Fan
Steps to remove the convection fan.
Removal of PCB
Steps to remove the main control board.
Burn Media Placement
Evolve 952 Stone Placement
Guide for placing stones in the 952 model.
Evolve 952 Log Placement
Guide for placing logs in the 952 model.
Evolve 1252 Stone Placement
Guide for placing stones in the 1252 model.
Evolve 1252 Log Placement
Guide for placing logs in the 1252 model.
Test and Verify
Visual Flame Inspection
Checking flame appearance and normal operation.
Normal Operating Sequence
Verifying the ignition and operation sequence.
Leak Test
Procedure for checking for gas leaks.

Table of Contents