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Carry out the procedure in Temperature Calibration above using the same equipment or the
same specifications.
If the mixed temperature has changed significantly from the previous test (e.g > 1°C), record the change
and before re-adjusting the mixed water temperarure, check:
• That the in-line filters are clean.
• The check valves or other anti-back siphonnage devices are in good working order.
• Any isolating valves are fully open.
• Check the balance between hot water and cold water (ΔP < 1 bar).
• Remove and clean the thermostatic cell.
With an acceptable mixed water temperature, complete the procedure as set out in commisioning
above. If the final mixed water temperature is greater than 43°C, the system requires service work.
FREQUENCY OF IN‐SERVICE TESTING
To comply with the National Health Service Model Engineering Specification DO8 and BuildCert TMV3
certification in-service tests should be carried out with a frequency which identifies a need for service
work before an unsafe temperature can result. In-service tests should initially, under normal conditions,
be carried out 6 to 8 weeks and 12 to 15 weeks after commissioning. If no significant changes (e.g. 1°C)
in mixed water temperatures are recorded between commissioning and the above in-service tests then
the next in service tests can be deffered to 24 to 28 weeks after commissioning.
If a small change (e.g. 1 to 2°C) or significant change (e.g. >2°C) in mixed water temperature which
may or may not require service work, are recorded in these period, then the next in service test should
be carried out at 18 to 21 weeks after commissioning.
A cold water failsafe should be carried twice yearly. Flow from the valve should stop within one second
after isolating the cold water supply
REMOVING THE BIOCLIP MIXER H9605 (Fig. E)
• To remove the body of the mixer from its base, shut-off the water supply (stopcocks provided) (5)
and loosen the grub screw (10) located on the side of the mixer without fully removing it, using
a 3mm Allen key. To replace the mixer, snap the body vertically onto the base and tighten the grub
screw. Open the stopcocks to allow the water to flow again. The mixer is supplied with a temporary
cover which can be fitted to the mixer base before installing the mixer body to prevent the build-up
of dirt and impurities etc.
• Cleaning the mixers regularly in a de-scaling solution will prevent the build-up of deposits and
encrustations and eliminate biofilm.
MAINTENANCE
• Check the calibration at least twice a year (Fig. C & D).
• We recommend checking the anti-scalding failsafe every two months and as often as necessary
depending on the water quality. Shut-off the cold water and ensure that the hot water shuts-off
in less than 2 seconds.
• To maximise the reliability of SECURITHERM thermostatic mixing valves over time, and to reduce the
risks associated with Legionella, we recommend an annual check of the following items:
1. Inter-changeable cartridge: de-scale internal parts and replace worn or damaged parts.
2. Mixing chamber: de-scale.
3. Replace the control lever and tighten to 13 Nm ±1 (Fig. F).
• We recommend checking that the thermostatic cartridge "seats" are waterproof twice a year and as
often as necessary depending on the water quality.
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