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40
Immersion Heater Replacement
If the thermal cut out on the Immersion heater operates contact a competent installer. If the thermal
cut out fault occurs again the immersion will need to be replaced.
Prior to installing the replacement Immersion, ensure the o-ring is correctly positioned on the head
of the Immersion and lubricate the threads before fitting.
Thread the Immersion by hand until it is hand tight and then tighten gently to allow the o-rings to
create a water tight seal.
Inspection
Where internal inspection of the cylinder is required an endoscope can be used. Inspection can be
carried out by draining down the cylinder and removing a component that is fitted to a wet connection
in the cylinder.
Safety Valve Checks
Water discharges from either the temperature/pressure relief valve or the expansion relief valve
indicates a problem.
• Check your discharge pipework is free from debris and is carrying water away to waste effectively.
• Next hold both of these safety valves open, allowing as much water as possible to flow through
the tundish.
• Release the valves and check that they reseat correctly.
Completion of the Benchmark Checklist on pages 42-43 must be adhered to by the
installer
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