Anode & tank inspection
•
It is possible to view the tank by removing the element to gain access. It is advisable the tank is inspected
at regular intervals for signs of corrosion.
•
There is a magnesium anode fitted to most models of the Power flow.
•
It is a grey magnesium cylinder fitted to the element base and its role is to reduce the rate of corrosion
of the tank.
•
It should be inspected periodically and replaced if there are signs of disintegration from a solid
metallic structure.
•
To access the anode, follow instructions in section 10.
•
Remove scale carefully. If necessary, dip element in a de-scaling solution available from DIY or plumbing
outlets. Do not allow electrical connections to become wet.
•
It is not normally necessary (or practical) to attempt to remove any scale from the tank walls.
•
Rest element and follow commissioning instructions as per section 8.
Safety valve checks
•
The Temperature and Pressure relief and expansion relief valve relieve any dangerous pressure or
temperature build up that may arise as a consequence of abnormal operation.
•
BOTH valves should be tested periodically by twisting the cap and checking that water flows freely.
The water flow should cease when the valve is released.
•
The pressure reducing valve contains a wire mesh gauze that may become clogged over time.To clean,
close off mains water and open a hot outlet to drain the system of water.
•
Unscrew the plastic top of the pressure reducing valve from the brass housing and remove complete
mechanism including wire mesh. Rinse mesh to remove grit, scale etc as necessary and replace.
•
Re-commission system following instructions as per section 8.
Expansion vessel
•
Water expands when it is heated.The expansion vessel accommodates expanded water during the heating
cycle via a pressurised diaphragm arrangement so that water is not wasted.
•
The vessel is supplied already pressurised to 3 bar.Over time the pressure may be lost and water may be
discharged during the heating cycle.
•
The pressure should be checked using a standard car tyre foot pump or similar device. The pressure
should be re-set to 3 bar.
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