Blue Box - 89
12. MAINTENANCE AND PERIODIC CHECKS
12. 1 WARNINGS
All operations described in this chapter MUST BE PERFORMED
EXCLUSIVELY BY QUALIFIED PERSONNEL.
Make sure that the unit has been disconnected from the power supply
before carrying out any work or accessing internal parts.
The compressor head and discharge pipeline can reach high temperatures.
Always exert caution when working in the vicinity of the compressor.
12.2 INTRODUCTION
Carry out the following periodic checks to ensure the unit is operating correctly:
CHECK PERIOD
Check that safety and control devices work correctly as previously described monthly
Check all the terminals on electric board and compressor are well locked. Periodic
cleaning of the sliding terminals of the contactors should be done: if any damage is
found, replace the contactors
monthly
Check the sight glass to verify the refrigerant charge. monthly
Check there is no oil leakage from compressor monthly
Check there is no water leakage in the hydraulic system monthly
If the unit is to be stopped for a long period the hydraulic circuit, including all pipes and
heat exchangers, should be drained. This is compulsory if the ambient temperature is
expected to fall below the freezing point of the liquid employed.
seasonal
operation
Check process water levels monthly
Check that the flow switch is operating correctly. monthly
Check that the crankcase heater operating correctly and the power supply. monthly
Clean metallic filters on water piping monthly
Check the colour of the sight glass core (green = no moisture, yellow = moisture
present): if it has a yellow colour, change the refrigerant filter
every 4 months
Check that the noise level has not increased. every 4 months
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