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CHECK STRAINERS AND NON-RETURN VALVES
Before completing the thermal shut down test, the combined non-return and strainer assemblies need to
be checked for cleanliness. (Refer to Servicing the Strainers and Check Valves section on page 19).
STEP 1
Using a 3/8” Allen key, unscrew the SQX™ check valve / strainer assembly and remove
from the mixer.
STEP 2
Inspect strainers and check valves for debris. Rinse in clean water if required.
STEP 3
Re-fit SQX™ check valve / strainer assembly and hand tighten with the Allen key.
THERMAL SHUT DOWN TEST
Once the correct outlet temperature has been achieved, the valve’s internal mechanism should be
exercised by alternately shutting off the hot and cold supplies while the tap is set at its operating
temperature.
TEST 1
While holding a digital thermometer in the outlet flow, quickly isolate the cold water supply
to the valve by closing the integral isolation valve on the cold inlet side. The outlet flow
should quickly cease flowing. As a rule of thumb the flow should be less than 0.1Lpm
following the isolation. Restore the cold water supply to the valve. After the mixed water
temperature has stabilised, note the outlet temperature. Ensure the outlet temperature has
re-established.
TEST 2
Repeat the above test, except this time quickly isolate the hot water supply to the valve.
The outlet flow should quickly slow to a trickle. As a rule of thumb the trickle should
typically be less than 0.4Lpm@500kPa down to less than 0.1Lpm@100kPa following
the isolation. Restore the hot water supply to the valve, measure and record the
outlet temperature after the mixed water temperature has stabilised. Ensure the outlet
temperature has re-established.
Ensure that all details of the Commissioning Report are completed and signed by the relevant
signatories and a copy is kept with the installer and owner of the premises.
The valve is now commissioned and it can be used within the technical limits of
operation.
COMMISSIONING