What is the commissioning sequence for a new gas central heating boiler installation?
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A
Complete gas tightness test, fill and vent heating system, commission controls, light and set up boiler per manufacturer instructions, flue gas analysis, complete Benchmark checklist
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B
Light the boiler first, then check for leaks
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C
Fill the system before the tightness test
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D
Flue gas analysis is done before lighting the boiler