8
IN-SERVICE TESTING
The purpose of in-service testing is to regularly monitor the thermal performance of
thermostatic mixing valve. Deterioration in performance can indicate the need for
service work to be carried out on the system.
If the authority concerned does not have a planned test and maintenance schedule
then the suggestions below should form the basis of a new system.
At intervals of 6-8 weeks and 12-15 weeks after commissioning:-
1.
Check supply parameters are still within the expected values if not check system
for faults.
2.
Carry out commissioning procedures using the same test equipment, if the mixed
water temperature has changed a significant amount (by more than 1K) check to
ensure in line filters are clean, that the check valves are working and all isolation
valves are fully open. If no fault can be found check and record the mixed water
temperatures and readjust mixed water temperature to the values in table 2.
Complete the commissioning procedure if the mixed water temperature exceeds
the values of the maximum recorded temperature by more than 2K the need for
service work is indicated.
Depending on the results of these two tests the following should be adopted
a)
If a small change (e.g. 1K to 2K) occurs in one of these tests or there is no
significant change (e.g. 1K maximum) then the next in service test should be 24
to 28 weeks after commissioning.
b)
If small changes occur in both test or a larger change occurs in one test
(exceeding 2K) then the next in service test should be carried out 18 to 21 weeks
after commissioning.
These results can then be used to set a service interval which tests have shown can
be used with no more than a small change in mixed water temperature. This method
of determining service intervals is used to take into account various in service
conditions (i.e. water condition) that the valve may experience.
Summary of Contents for VADO-PRO-100P
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