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In-service Testing
The purpose of in service testing is to regularly monitor the thermal performance of the thermostatic
valve; deterioration in performance can indicate the need for service work to be carried out on the
system or the Bath Shower Mixer
IMPORTANT: It is a requirement that all TMV2 approved products shall be verified against the
original set temperature results at least once a year. When commissioning/testing is due the
following performance checks should be carried out.
1. Carry out commissioning procedures a to c (see "Commissioning")
2. Check supply parameters are still within the expected values if not check system for faults.
3. Measure the mixed water temperature at the outlet
4. Carry out the cold water fail-safe shut off test by isolating the cold water to the Bath and
Shower Mixer. (see "Maintenance"). Wait five seconds and if water is still flowing check that
the temperature is below 46°C
5. If there is no significant change to the outlet temperature (±2°C or less change from the original
settings) and the fail safe is functioning then the valve is working correctly and no further service
is required.
6. If the mixed water temperature has changed a significant amount check to ensure in lines filters
are clean, that the non return valves are working and all isolating 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 value in the table (see "Mixed Water Temperature")
7. If the mixed water temperature exceeds the values of the maximum recorded temperature then
there will be a need for servicing work to be undertaken.
Please note: Ensure any temperature gauges are calibrated before use and the sensing part of
the thermometer probe must be fully submerged in the water that is to be tested and as close to the
outlet as possible. For the T555 Bath and Shower Mixer this should be done so at the open outlet
of the spout and not through hose/handset or shower head.
IMPORTANT: The mixed water temperature and the terminal fitting must not exceed 46°C
Notes
If there is a residual flow during the commissioning or the annual verification (cold water supply
isolation test), then this is acceptable providing the temperature of the water seeping from the valve
is no more than 2oC above the designated maximum mixed water outlet temperature setting of the
valve. Temperature readings should be taken at the normal flow rate after allowing for the system to
stabilise. The sensing part of the thermometer probe must be fully submerged in the water that is to
be tested. Any TMV that has been adjusted or serviced must be re-commissioned and re-tested in
accordance with the manufacturers' instructions.
High Pressure Installations Only
The Dual control Thermostatic Bath and Shower Mixer works exceptionally well when fitted onto high
pressure systems. Offering a flow rate of over 45 litres per minute at 2.5 bar (balanced pressures).
However for installations of this nature and above Pegler Yorkshire recommend the installation of
a flow regulator fitted to the outlet end of the product – which will help with the performance of the
cold water safety shut failure. Follow the procedures below for installation of the regulator.
1. Ensure the requirement for the regulator is needed by checking and confirming the system
pressure of hot and cold.
2. Turn bath water supplies off, this can be done via primary water supply stop or isolating valves
or the fitted service valves.
3. Using an appropriate spanner on the two flats of the outlet, unscrew the assembly.
4. Once removed, take out the seal and eject the flow straightener by pushing it out of the chrome
casing.
5. Insert the replacement flow regulator (supplied in the box) into the chrome casing, and screw
back into the spout ensuring the seal is used.
6. Turn the water on and watch for few seconds to ensure that the outlet assembly in not dripping
from the outside of the threads. If this occurs simply tighten a little more.
Please note: If fitting the flow regulator outlet please ensure that the unit is cleaned at regular
intervals. This is especially important in hard water areas.
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