17
COMMISSIONING
Commissioning must be carried out in accordance with these instructions,
and must be conducted by designated, qualified and competent personnel.
Exercising the Thermostat
Thermostatic mixing valves 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.
Maximum Temperature
The maximum blend temperature obtainable by the user should be limited, to prevent
accidental selection of excessive hot temperatures.
All Rada thermostatic shower controls are fully performance tested, and the maximum
temperature is preset to approximately 43°C under ideal installation conditions at the
factory.
Site conditions and personal preference may dictate that the maximum temperature
has to be reset following installation. For Type 3 valves in healthcare installations the
maximum blend temperature is determined by the application - see table under
Application and Designation
This shower control is provided with a levered, adjustable temperature control knob,
which allows the user to select the blend temperature between ambient cold up to a
preset maximum.
Maximum Temperature Setting
(Refer to Figure 7)
Check that an adequate supply of
hot
water is available at the hot inlet of the shower
control.
During resetting, the hot supply to the shower must be as close to the typical maximum
to offset the possibility of any blend shift due to fluctuating supply temperatures.
However, the minimum temperature of the hot water
must
be at least 12°C above the
desired blend for correct operation.
Temperatures should always be recorded using a thermometer with proven accuracy.