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Version 1, 21 August 2019, 11 of 21
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Ensure both the hot and cold water supplies have been isolated. Remove power from proximity sensor to ensure
water supplies have been isolated correctly and no water flows.
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Slide the cover sleeves forward (to the body).
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Unscrew the brass union using metric spanner 30mm. Remove strainers then using circlip pliers, remove clips from
both fittings. Remove the non-return valves.
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The strainers and non-return valves should be cleaned with a dilute water solution of suitable de-scaling solvent (such
as CLR), checked for physical damage and then thoroughly rinsed with clean water.
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Replace any broken filters or faulty non-return valves.
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Re-fit strainers and non-return valves.
2. Thermostatic Cartridge
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Ensure both the hot and cold water supplies have been isolated.
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Open the mixer to ensure water supplies have been isolated and no water flows from the outlet.
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Using a spanner or deep socket on the brass headwork turn the cartridge in the counter clockwise
fashion until it reached the end of its threads and then pull it out of the mixer body.
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Remove the cartridge by hand and clean all components thoroughly. Inspect components for damage. If
components are damaged, the cartridge must be replaced.
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The cleaned cartridge (or a new cartridge, if this is required) can now be re-installed, by screwing into the
mixer body until it reaches a firm stop and tightened. Re-fit the cover, and re-commission the mixer (as
per commissioning procedure).
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When service is complete, slowly open the cold water isolation valve and inspect mixer body for leaks.
Repeat with hot water isolation valves. Commence commissioning process.
Annual Maintenance Procedure
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Every 12 months the thermostatic mixer must be inspected & tested. The valve should be inspected for
leaks or water damage and appropriate action taken if required.
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Carry out the general servicing of the valve as set out in this document
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A thermal shut down test is performed (Shut Down Test 1 and 2 as set out in this document), and the
temperature is reset as required.
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If the valve fails to shut down or fails to maintain its set temperature, then refer to Troubleshooting
section.
5 Year Maintenance Procedure
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Every five years the thermostatic mixer needs to have a full service carried out. This service consists of
the same procedure as the ‘Annual Maintenance Procedure’ listed plus the thermostatic mixer cartridge
must be replaced.
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After replacing the thermostatic mixer cartridge, a thermal shut down test is performed, and the
temperature re-set as required. If the valve fails to shut down or fails to maintain its set temperature, then
refer to the troubleshooting section.
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Once the 5 yearly maintenance procedure is complete, the thermostatic mixer should then be
commissioned as per instructions.
Cover
