Armstrong Rada 425 Manuale di installazione e manutenzione - Pagina 6
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Commissioning the Rada 320
Commissioning must be carried out in accordance with these instructions, and must be conducted by
designated, qualified and competent personnel.
Ensure that the hot and cold supplies are at their designated pressures and temperatures. Open mixed water
outlet(s) and wait until the hot and cold inlet temperatures are stable. Note the mixed water temperature.
If the mixed water temperature requires adjustment, turn the temperature control handle clockwise to reduce the
temperature or counterclockwise to increase it. Allow a few seconds for the temperature to stabilize.
If the blend temperature required is not obtainable (not hot enough) it is likely that the mixing valve has reached
the factory calibrated maximum temperature set point. To recalibrate set point see Maximum Temperature
below.
Maximum Temperature.
The maximum blend temperature obtainable through the mixing valve should be limited to prevent selection of a
system temperature that is too hot.
Rada 320 is fully performance tested and the maximum temperature is pre-set to approximately 110°F (43°C)
under ideal installation conditions at the factory.
Site conditions and design preference may dictate that the maximum temperature has to be re-set following
installation.
Maximum Temperature Setting
Check that an adequate supply of hot water is available at the hot inlet of the mixing valve.
For optimum performance the minimum temperature of the hot water must be at least 21°F (12°C) above the
desired blend, however during resetting this should be close to the typical storage maximum to reduce the
possibility of any blend shift due to fluctuating supply temperatures.
Temperatures should always be recorded using a thermometer with proven accuracy.
For Adjustable Temperature
1. Remove the temperature knob screw using a 3 mm hexagonal wrench (supplied). Remove the temperature
knob.
2. Pull off the black polymer hub assembly which may inadvertently remain attached to the inside of the
temperature control handle. This is a "push fit" and can be "levered" out using a thin blade screwdriver or
pliers.
3. Rotate the spindle until required maximum blend temperature is obtained at outlet point (clockwise =
decrease temperature, counterclockwise = increase temperature). When resistance is felt do not use
force to turn any further, as this can damage the internal parts.
4. Once the desired maximum blend temperature is achieved, re-fit the hub without disturbing the spindle:
Position the hub so that the hub stop comes up against the cartridge stop (refer to Figure 7-1) preventing any
further rotation in a counterclockwise direction. Check that blend temperature has not altered.
5. Refit the temperature knob. Make sure that the indicator points to 9 o'clock.
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