7
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)
make sure 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.
Commissioning Checks
(Temperatures should always be recorded using a thermometer with proven
accuracy)
1.
Check the inlet pipework temperature for correct function of the checkvalves.
2.
Operate the Meynell V8/3 and check:
Flow rate is sufficient for purpose
Temperature obtainable is acceptable
All connections are watertight.
3.
It is advisable to establish a performance check at this time, which should
be noted for future reference as part of a Planned Maintenance Program (a
Maintenance Record Card has been provided with this Manual).
The procedure should be chosen to imitate both typical and difficult operating
conditions, such as any supply pressure fluctuations that may be likely. An ideal
method is to locate another outlet on the common cold water supply close to the
Thermostatic Mixing Valve (operating this outlet should cause a drop in supply
pressure), and note the subsequent effect on blend temperature. This should be no
more than 2°C change).
Note!
Causing thermal shutdown of the Meynell V8/3 by full closure of the cold
supply may not adequately indicate the practical capability of the Meynell V8/3, nor
its service condition. Consequently this is not a recommended performance check,
and repeated such testing may ultimately affect service life.
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