Frequency of In-service Tests
Healthcare
Follow the procedure detailed in the ow diagram
“In-service Test Procedure”. This procedure must
be followed 6 to 8 weeks after commissioning
and 12 to 15 weeks after commissioning. The
recorded blend temperature
(Tb)
from these two
tests will determine the maximum frequency for
future service intervals.
Result of 6-8
week tests
Result of
12-15 week
tests
Next service
interval
< 1°C < 1°C 9 - 12 weeks
> 1°C < 1°C 9 - 12 weeks
< 1°C > 1°C 9 - 12 weeks
> 1°C > 1°C 6 - 9 weeks
The subsequent in-service test results should be
used as a guide, in conjunction with a suitable risk
assessment, to determine the schedule of future
in-service tests.
More regular temperature checks should be
made where increased risks are perceived, i.e.
patients are unable to immediately respond to an
increase in water temperature, by either shutting
the water off or removing themselves from contact
with the water.
Maintenance personnel should also make sure
that the staff are aware of the importance of
reporting temperature variations and when
detected, these should be recorded in the Log
Book.
Commercial
Check for correct blend setting every 6 months.
Follow the procedure detailed in the ow diagram
“In-service Test Procedure”, every 12 months.
Start
Measure and record supply
temperature and pressures. Make sure
that they are within valve specications.
Measure and record blend
temperature
(Tb)
and ow rate.
Has ow rate fallen
signicantly or fallen
below minimum ow
specication?
Check and clean non return
valve, strainers and outlet.
Measure and record blend
temperature
(Tb)
and ow rate.
Has ow rate
improved?
Carry out a performance check.
Refer to the commissioning
procedure.
Yes
No
Yes
Has the blend
temperature
changed by more
than 2°C from the
previous recorded
value
(Tb)
?
Refer to section: ‘Fault
Diagnosis’.
Carry out the commissioning
procedure.
No
Yes
Finish
No
Note! All measurements and results should be
recorded in the Log Book.
Flow Diagram, In-service Test Program
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