8.1.10 Checking the expansion vessel (If fitted).
NOTE:
It is not necessary to perform this check every year a check every three years is
sufficient.
● Release the pressure from the boiler.
● Remove valve cap from expansion vessel charge point.
● Check that the internal charge pressure of the expansion vessel is to the correct design
pressure. If the pressure is lower than this the vessel should be re pressurised using an
air pump.
● Refit the valve cap.
● Re pressurise boiler and heating system.
8.1.11 Re commissioning the boiler
● Carry out electrical safety checks.
● Turn on the electrical supply.
● Open the boiler CH service valves.
● Carry out function checks of boiler operation as previously detailed.
● Check gas rate as previously detailed.
● Check for water leaks.
● Refit case, ensuring that a good seal is obtained.
8.1.12 Test operation
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