Testing the Safety Features
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16. Testing the Safety Features
The safety features for excess temperature protection and
low liquid level protection must be checked at regular inter-
vals. The level of regularity of checking depends on the unit’s
designated application and the heat transfer liquid used (in-
flammable or non-inflammable). Practical experience has
shown that between 6 to 12 times a year is sufficient.
16.1 Excess temperature protection
Set a cut-off temperature (see chapter 14.1) that is lower
than the desired set temperature. Switch on the circulator
and check if the circulator really does switch itself off at the
set cut-off temperature
If not follow the specifications detailed in chapter 14.1.1.
It may be deemed necessary to have the unit checked over
by qualified service personnel.
16.2 Low liquid level protection
Drain the heat transfer liquid slowly during operation (use
a drainage tap if necessary) and check if the unit really does
switch itself off (see chapter 11).
If not the unit must be checked over by qualified service per-
sonnel.
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