The engineer will then perform visual checks for obvious defects and to check that the unvented hot water cylinder has been installed in accordance with the manufacturer’s instructions.
Next, the expansion system will be identified. It will either be an internal expansion vessel or an external expansion vessel. The line strainer will then be checked and cleaned and the condition of the seals will be assessed and to see if they need to be replaced.
Then we will check the operation of the safety valve, tundish drainage, interlocks with external controls and the thermostat.