Testing of the temperature for legionella should be taken on a monthly basis as per HSE guidelines.
The minimum temperature which starts to burn the skin is 45 degrees (depending on the skin condition and contact time), therefore this creates conflicting views between storing hot water at 60 degrees and the risk of scalding.
Hot water needs to be controlled by either TMV’s or warning signs. TMVs are generally used in public buildings such as hospitals, nursing homes, schools, leisure centres etc.
As the temperature is blended to below 50 degrees, testing of the temperature for legionella should be taken on a monthly basis as per HSE guidelines, all records are then submitted in the building’s logbook to show a timeline of how the water has performed.
According to the TMV2 scheme, it is a requirement that all TMV2 approved valves shall be verified against the original set temperature results once a year. TMV3 valves must also receive a regular in-service test to check they are performing adequately. If they are not, the valve must be serviced.
However, prior to any servicing taking place, a risk assessment will help to determine the risk and advise if a TMV is required in the first instance. However, due to the ambient temperatures that a TMV generates, annual, or otherwise specified, inspection, cleaning, descaling and disinfecting is required.
Initially, the TMV will be accessed and a failsafe test will be carried out, this is done by isolating the cold supply into the valve and the hot tap turned on with a temperature probe reading monitor to check if the hot supply cuts off before the temperature increase above 50 degrees. Once the failsafe is complete the valve will be isolated, and if valves are present and in good working order, they will be stripped down to complete a clean, descale and disinfection of strainers using a suitable disinfectant and descaling method. Once complete, the valve is flushed through and re-assembled and put back into service with the hot temperature set to between 39-43 degrees.
If a valve fails, this test there will be recommendation made for the TMV to be replaced. A report will be completed detailing the work completed on each valve with recommendations included.
This cleaning is important to ensure there is no dirt that could lead to bacteria growth such as Legionella.
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