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PASHW-003-100LD
warranty/guarantee and the stainless steel cylinder may be seriously
damaged.
In hard water areas consideration should be given to periodically descaling
the immersion heater elements. To do this the unit will need to be drained;
Paragraphs 16.4 to and 16.6 below detail how to drain the unit and remove
the immersion heater(s).
Please check the condition on the magnesium anode during any
servicing/maintenance and fit a new anode, if required.
15.2 Safety Valves
Slowly open the Temperature and Pressure Relief Valve by twisting its cap
for a few seconds. Check that water is discharged and that it flows freely
through the tundish and discharge pipework. Check valve reseats correctly
when released.
NOTE : The water discharged may be very hot.
Repeat the procedure for the Expansion Relief Valve (located on the Cold
Water Combination Valve or Expansion Valve Core Unit).
15.3 The Strainer
The in line strainer must be cleaned periodically by a suitably qualified
engineer. The in-line strainer can be found inside the cold water combination
group valve on unvented systems or alternatively a Y strainer on open vented
systems. The engineer should:
i) Wash any particulate matter from the inline strainer under clean
running water.
ii) Refit the inline strainer once totally clean or install a new one
where necessary.