Page 92 / 100 Technical Notice V1.0 / 01.09
13 Breakdowns
13.3 Breakdowns
Before any intervention on the unit, cut off its power supply at the source. Take care of certain
parts of the refrigeration circuit which can be very hot.
Problems with normal operations are manifested by:
• a halt of the refrigeration unit (one or more pumps and/or the compressor do not run)
• abnormal discrepancies in the coolant temperature.
At the first occurrence of an abnormal situation, the cause of the problem should be determined following
the procedures listed below.
If Option Y, programmable problem recovery
controller is installed:
- Consult the display unit (1).
13.3.1 The unit doesn't work
Looking for the cause of the breakdown:
A. Check the power supply for the unit.
B. Check that the safety switch (10Q1) is in position 1 (power on for the unit),
C. Check the pump circuit breaker if there is one (check the schematics in the technical data sheet). Acces-
sible by opening the unit's cover hood.
D. Check the power supply for the command circuit (fuse).
E. Check the level of the liquid in the reservoir: If the level is too low, the pump stops and signals a fault.
After topping up the liquid, the unit must be stopped and restarted by toggling the safety switch (10Q1)
in order to suppress the fault signal.
F. Check if the pump is running. The motor might be controlled with the electric contact switch (option). A
switch (optional) protects the pump in the event of overload.
Fig. 13-1 : programmable problem recovery
controller
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