Akw T301 Installations-, Wartungs- und Gebrauchsanweisungen - Seite 11

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In-Service Testing
The purpose of in-service testing is to regularly monitor the thermal performance
of the T301 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 1°C) 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 re-adjust mixed water temperature to the values in table 3, complete the
commissioning procedure. If the mixed water temperature exceeds the values of
the maximum recorded temperature by more than 2°C 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. 1°C to 2°C) occurs in one of these tests or there is no
significant change (e.g. 1°C 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 2°C) 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.
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