© Intatec Ltd 2016
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In Service Testing
3. If the mixed water temperature is acceptable, carry out the following:
a) Record the temperature of the hot and cold water supplies.
b) Record the temperature of the mixed water at the largest draw off flow rate.
c) Record the temperature of the mixed water at the smallest draw off flow rate.
d) Isolate the cold water supply to the mixing valve and monitor the mixed water
temperature.
e) Record the maximum temperature achieved as a result and the final temperature (the
final temperature should not exceed the values quoted in table 2)
f) Record the equipment used during these tests.
4. If during the test, paragraph 3, the mixed water temperature is greater than the values quoted
in table 2 or the maximum temperature exceeds the corresponding values from previous test
results by more than 2˚C, the tap must be serviced.
5. After a period of between 12 and 15 weeks after commissioning, carry out the sequence of
tests as described in 1, 2, 3 and 4 of this section.
6. Dependant upon the results obtained from the first two series of tests; there are a number of
possible outcomes.
a) If no significant change in the mixed water temperatures (e.g. < 1˚C) is recorded
between commissioning and step 3e above or between commissioning and 5 of this
section, the next in service testing should be carried out at a period of 24 to 28 weeks
after initial commissioning.
b) If a small change (e.g. 1 - 2˚C) in the mixed water temperature is recorded in only one
of these periods, necessitating adjustment of the mixed water temperature, then the next in
service test can be deferred to 24 to 28 weeks after commissioning.
c) If small change (e.g. 1 - 2˚C) in the mixed water temperature is recorded in both of these
periods, necessitating adjustment of the mixed water temperature, then the next in service
test can be deferred to 18 to 21 weeks after commissioning.
d) If significant changes (e.g. >2˚C) in the mixed water temperature are recorded in both
of these periods necessitating service work, then the next in service test should be carried
out at 18 - 21 weeks after commissioning.
7. The general principle to be observed after the first two or three in service tests is that the
intervals of future test should be set to those which previous tests have shown can be achieved
with no more than a small change in mixed water temperature.
8. In all areas periodic maintenance of the valve and associated fittings i.e. strainers, check
valves will ensure optimum performance levels are maintained.
9. On the inlet strainers on both the hot and cold water supply inlet can be removed for cleaning.
10. The built in check valves can be accessed in a similar way to the filters to ensure freedom and
correct seating.
Summary of Contents for HTMDMCP
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