rada 320, Manual, Page: 18 / 32

18 1300905-W2-A
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 43
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.
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:
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 15 oC 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 (If installed).
Temperatures should always be recorded using a thermometer with proven accuracy.
Commissioning
1. Ensure that the hot and cold water are available at the valve inlets, and the outlet is
open.
2. Move the temperature control rapidly from cold to hot and hot back to cold several times,
pausing at each extreme.