DTC INST 145 issue 2 – 16.11.07
Operating Conditions of Use (CONTINUED)
The mixer is designed to allow a maximum pre-set temperature of 46°c in line
with the TMV2 approval.
The mixer works within the parameters set out within the requirements of TMV2
at low pressure and is guaranteed to have the anti-scald facility up to 46°c,
which is the maximum limit stated in the standard.
In cases were the mixer is fitted to high pressure systems or systems with
mixed pressures, it become necessary to fit flow restrictors (supplied) in the
following scheme:
You will receive a kit composed of;
Yellow valve / pink insert x 1 – this is a flow restrictor and check valve
Yellow valve / white insert x 2 – these are flow restrictors and check valves
Brass housings x 2 – these hold the above
White valves x 2 – these are check valves only
SYSTEM
COLD INLET
HOT INLET
GRAVITY BOTH SIDES
CHECK VALVE
CHECK VALVE
MAINS COLD/GRAVITY HOT
PINK
CHECK VALVE
UNVENTED BOTH SIDES
WHITE
WHITE
PUMPED BOTH SIDES
CHECK VALVE
CHECK VALVE
GAS INSTANTANEOUS HEATER
WHITE
WHITE
MAINS COLD/PUMPED HOT
WHITE
WHITE
GRAVITY COLD/PUMPED HOT
CHECK VALVE
WHITE
(PINK RATE – 15 L/MIN ------ WHITE RATE - 8 L/MIN)
Commissioning and Testing
It is a requirement that all TMV2 approved valves shall be verified
against the original set temperature results once a year. When
commissioning/testing is due the following performance checks shall
be carried out.
NOTE: The mixed water temperature at the terminal fitting must never exceed
46°c
After installation the product and the pipe work must be checked for water
tightness, to ensure no leaks are present.
Once this has been carried out a cold water failure test should be completed
to check the shut off is operating correctly.
If the product has been installed in compliance with the operating specification
indicated this should operate correctly.
The product should be tested thereafter at intervals agreed by the
contractor/installer, but should never exceed 12 months.
The testing will only require a standard thermometer with a scale of more than
65°c. The temperature sensitive element of the ther mometer should be fully
inserted into the water flow of the mixer.
Measure the mixed water temperature.
Carry out a cold water failure test by using the isolation valve to shut off the
cold supply.
Wait for 5 seconds if the water is still flowing check the water temperature is
below 46°c. The flow should stop or reduce to a tri ckle.
Open the cold water isolation valve and measure the mixed water
temperature
If there is no significant change from the original settings and the shut off is
functioning correctly, no further action is required.
If the outlet temperature has drifted by more then 2°c, or the shut off does not
work correctly, a full service or re-commissioning is required.
