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IN-SERVICE TESTING
To comply with the National Health Service Model Engineering Specification DO8 and BuildCert TMV3
certification DELABIE recommends 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 in Calibrating the Temperature 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 siphonage devices are in good working order.
• Any isolating valves are fully open.
• Check the balance between hot water and cold water (DP < 1 bar).
• Remove and clean the thermostatic cell.
With an acceptable mixed water temperature, complete the procedure as set out in Calibrating
the Temperature above. If the final mixed water temperature is greater than 43°C, the system requires
service work.
MAINTENANCE
• Check the calibration at least twice a year (Fig. A).
• We recommend checking the anti-scalding failsafe twice a year in hard water areas
or if the water is heavily charged. Shut-off the cold water and ensure that the hot water shuts off
in less than 2 seconds.
• To maximise the reliability of thermostatic mixing valves over time, and to reduce the risks associated
with Legionella, DELABIE recommends an annual check of the following items:
- Interchangeable cartridge: descale internal parts, and replace any worn or damaged components.
- Remove the cartridge by unscrewing the chamber anti-clockwise by hand (Fig. C).
- Mixing chamber: descale.
- Check the stainless steel filters and clean if necessary.
• In the event of malfunction during checks: clean the mechanisms and descale. Change any worn parts
if necessary.
MAINTENANCE & CLEANING
• Cleaning chrome, aluminium and stainless steel: do not use abrasive, chlorine or any other acid-
based cleaning products. Clean with mild soapy water using a cloth or a sponge.
• Frost protection: drain the pipes and operate the valve several times to drain any remaining water.
In the event of prolonged exposure to frost, we recommend taking the mechanisms apart and storing
them indoors.
For the UK market only: Tel. 01491 821 821 - email: technical@delabie.co.uk
For all other markets: Tel. +33 (0)3 22 60 22 74 - email: sav@delabie.fr
After Sales Care Support:
The installation guide is available on: www.delabie.co.uk
The installation guide is available on: www.delabie.com
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