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THERMAL SHOCK (FIG. C & D)
SECURITHERM mixers are designed to withstand thermal and chemical shocks recommended by current
regulations.
It is possible to activate a thermal shock at the temperature of the hot water in the system.
• Turn the control lever a to the maximum hot water position d.
• Loosen the grub screw l without fully removing it, using a 2.5mm Allen key, and remove the control lever.
• Using the 2.5mm Allen key, turn the screw on the spindle m as far as possible to achieve
the temperature of the hot water in the system (approx. 3 turns).
Once the thermal shock is complete do not forget to re-commission the mixer.
IN-SERVICE TESTING
To comply with the National Health Service Model Engineering Specification DO8 and BuildCert TMV3
certification we recommend the following.
The purpose of in-service tests is to regularly monitor and record the performance of the thermostatic
mixing valve.
Carry out the procedure a to c 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 temperature, 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 a to d as set out in Commissioning
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 deferred to 24 to 28 weeks after commissioning.
The general principal to be observed after the first 2 or 3 in-service tests is that the intervals of future
tests should be set to those which previous tests have shown can be achieved with no more than a small
change in mixed water temperature.
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) i
and loosen the grub screw n 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.
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