Rointe D SERIES - 11.9. Manually lift the expansion relief and temperature and pressure relief valve

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11.7. Check the charge pressure in the expansion vessel and top
up as necessary. The charge pressure should be 0.15 or 0.3 MPa.
11.8. Close the drain cock, disconnect the hose, refit the heating
element and close all hot water taps before reopening the stopcock.
Allow the cylinder time to fill whilst checking for any leaks. Release
any air from the system by opening each hot water tap individually,
starting with the one furthest from the cylinder.
11.9. Manually lift the expansion relief and temperature and pressure
relief valve one at a time, every 12 months (more frequently in hard
water areas) to prevent debris from building up behind the valve
seat. Whilst carrying out this operation, check that the discharge
to waste is unobstructed. Check that each valve seals correctly
when released. As the valves are pre-calibrated, they require no
further maintenance.
11.10. Finally, when the heater is full of water switch on the mains
electricity supply to the water heater. As the system heats up,
check again for any leaks and rectify as necessary.
11.11. In the event of the manual reset cut-out operating, isolate the
heater from the mains supply, investigate and identify the cause of the
operation of this cut-out, rectify the fault before manually resetting the
cut-out via the reset button on the cut-out. Finally switch the mains
electricity supply back on.