rada 425-t3, Product Manual

Page: 13 / 40

13
COMMISSIONING
Commissioning must be carried out in accordance with these instructions, and
must be conducted by designated, qualified and competent personnel.
Maximum Temperature
Exercising the Thermostat
The maximum blend temperature obtainable by the user should be limited, to
prevent accidental selection of a temperature which is too hot.
All Rada Thermostatic mixing valves are fully performance tested individually and
the maximum temperature is pre-set to approximately 45
o
C under ideal installation
conditions at the factory.
Site conditions and personal preference may dictate that the maximum temperature
has to be re-set following installation (For Type 3 valves in healthcare installations
the maximum blend temperature is determined by the application - see Table under
Application in Type 3 Valves ).
Maximum Temperature Setting
Check that an adequate supply of hot water is available at the hot inlet of the
mixing valve.
The minimum temperature of the hot water must be at least 12 o C above the
desired blend, however, during resetting this should be close to the typical storage
maximum to offset the possibility of any blend shift due to fluctuating supply
temperatures.
Check that both inlet isolating valves are fully open.
Temperatures should always be recorded using a thermometer with proven
accuracy.
Thermostatic mixing valves with wax thermostats are inclined to lose their
responsiveness if not used. Valves which have been in storage, installed but not
commissioned, or simply not used for some time should be exercised before
setting the maximum temperature or carrying out any tests.
A simple way to provide this exercise is:
(a) ensure that the hot and cold water are available at the valve inlets, and the
outlet is open.
(b) move the temperature control rapidly from cold to hot and hot back to cold
several times, pausing at each extreme.