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Details electrical supply requirements, including earthing and isolation.
Provides a table for sizing discharge pipes based on valve outlet and length.
Illustrates the calculation process for sizing a discharge pipe.
Instructions for drilling and fixing the boiler mounting bracket.
Steps for lifting and attaching the boiler to the wall bracket.
Details on ensuring airtight joints and correct pipe fitting.
Steps for connecting the gas supply union and pipework.
Covers mains connection, isolation, surge protection, and wiring polarity.
Comprehensive steps for filling the heating system with water and venting.
Procedures for powering on, checking pressure, and initial burner operation.
How to assess the burner flame appearance at low and high positions.
Procedure for checking burner gas rate using a stopwatch and meter.
Details flue gas sampling and adjustment of CO2 levels.
Instructions for cleaning the heat exchanger and inspecting air/flue systems.
Important safety warnings before starting component replacement.
Step-by-step instructions for replacing the gas valve.
Step-by-step instructions for replacing the fan.
Instructions for replacing the ignition transformer.
Procedures for replacing burner, electrodes, and sight glass.
Instructions for replacing the high limit thermostat, including heat sink paste.
Steps for removing and replacing the boiler control unit.
Steps for replacing the pump head, including venting.
Instructions for replacing the three-way valve or its head.
Steps for replacing the temperature and pressure relief valve.
Steps for removing the tank and reconnecting pipes, including fast recovery coil.
Explains warning codes displayed on the unit and their implications.
Explains block codes which indicate errors not causing immediate shutdown.
Explains malfunction codes that shut down the appliance and require a reset.
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General
