Hygiene Equipment
Designed for People
39
Routine maintenance
Important information regarding the Thermostatic mixer
The use of the word ‘failsafe’ to describe the function of a thermostatic mixing valve is both incorrect and
misleading.
In keeping with every other mechanism, it cannot be considered as being functionally infallible.
Malfunction of thermostatic mixing valves is almost always progressive in nature and will be detected during
proper temperature checking and maintenance routines.
Certain types of system can result in the thermostatic mixing valve having excessive ‘dead-legs’ of pipework.
Others allow an auxiliary cold-water supply to be added to the mixed water from the mixing valve. Such
systems can disguise the onset of thermostatic mixing valve malfunction.
Ultimately, the user or attendant must exercise due diligence to ensure that the delivery of warm water is at a
stable, safe temperature.
This is particularly important in such healthcare procedures as supervised bathing of patients unable to
respond immediately to unsafe temperatures.
In healthcare applications such as hospitals, residential care homes, etc. and in any other applications
where the user is similarly at risk, irrespective of supply and usage conditions or the evidence of in-service
tests. TR Equipment recommends the critical components replaced at intervals of no more than 5 years.
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