Performance Check
Six Monthly
Exercising the Thermostat: If the valve has not been in regular or recent use the thermostat
should be exercised before any other checking. Where user adjustment of the blend
temperature is available the exercising of the thermostat can be achieved as described in
COMMISSIONING. For valves with locked temperature control it is necessary to isolate and
restore each supply in turn a few times.
Blend Temperature: check for correct blend setting and/or maximum preset temperature.
Reset as necessary.
Performance: check blend stability against known datum (e.g. commissioning check) for an
induced pressure or ow change. Renew thermostatic cartridge when necessary.
Function: check inlet pipework temperature for correct function of checkvalves, and maintain/
renew as necessary. Check and clean strainers as appropriate. Lubricate accessible seals
when necessary using silicone-only based lubricant.
Temperature Testing
Check and record warm water temperature regularly to conrm correct operating performance
of the valve. In health care applications such as hospitals, aged persons facility, nursing homes
etc. such checks must be made at least every month. More regular temperature checks
should be made where increased risks are perceived such as where patients are unable to
immediately respond to an increase in water temperature by either shutting the water off or
removing themselves from the contact with the water. Records of warm water temperature
checks should be included in a log book.
Thermostatic Mixing Valve Performance Records (Log Book)
It is recommended that the user maintains a log of the in-service tests described herein,
together with a record of any service work carried out and the replacement of cartridges.
It is also recommended that any maintenance personnel sign the user log in respect of all
thermostatic mixing valves examined on each attendance at the user's premises.
It is recommended that the Maintenance Log should record the following:
Details of valve, location and use, risk level and instructions
Valve make and model
Valve unique identication number
Valve location
Date installed
Application i.e. type of discharge: bath, shower etc.
Risk assessment report number
Risk level found (e.g. vulnerability of patient)
Frequency of critical component (cartridge) replacement
Frequency of temperature monitoring
Responsibility for temperature monitoring
Location of temperature monitoring records
Source of spares and advice
Issue number of Product Manual (Installation, operating and maintenance instructions).
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