Horne Engineering Ltd
Issue 7, November 2018
8
To remove the spray plates from the fixed shower head, rotate the lock rings to 30 degrees anticlockwise
to release the bayonet fitting and then ease out the spray plates by the lock ring. Note that for the fixed
showerhead, a tool is supplied with the showerhead to engage the lock ring as shown in Fig 10.
Fig 10.
See attached drawings 8341 and 8342 for parts lists for ordering spares.
IN-SERVICE TESTING
Periodic testing should be carried out to check whether or not any deterioration has occurred in the
performance of the TSV1-3. The results of these tests, and the equipment used, should be recorded on
the Commissioning, Maintenance and In-Service Testing Sheet at the back of these instructions. Fill in all
the parameters requested on the sheet.
Note that instrumentation to the same specification should be used each time when measurements are
taken to ensure consistency of results. Record all the information on the In-Service Testing sheet at the
back of these instructions.
A thermal shut-
off test, as described under “Maintenance” above, should be carried out. Ensure that the
servicing valves are fully opened (see Fig 6) before performing this test. If mixed water continues to flow
and is coming from the showerhead at a temperature of more than 2°C above the maximum mixed water
temperature setting then the TSV1-3 is due for maintenance. Any requirement to adjust the Mixed Water
Temperature should be recorded, and the strainers checked for cleanliness, and check valves checked.
Note: A thermostatic mixing valve in need of maintenance can be undetectable in normal use and
only become apparent when disruption occurs in the hot or cold water supply temperatures or
pressures. In service testing should be carried out at a frequency to detect any such deterioration.
The frequency of in-service testing depends upon the condition of the water passing through the TSV1-3.
In-service testing must be carried out more frequently in hard water areas than in soft water areas. As a
general guide, in-service testing should be carried out at intervals somewhere between 6 months and 12
months. In-service testing should be carried out at least every 12 months and, where the water is hard,
the interval may be less than 6 months. Experience of local conditions and the in-service testing record
will dictate the frequency of in-service testing. In the absence of practical experience of this, a first check
6
– 8 weeks after commissioning should be performed. If no problems are detected (and mixed water temp