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
Summary of Contents for SIGMA 2002
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Page 100: ...Blue Box 94 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 SIGMA 2002 DC MODELS 14 4 26 4...
Page 101: ...Blue Box 95 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 HP MODELS 3 2 8 2 14 4 16 4...
Page 102: ...Blue Box 96 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 HP MODELS 9 2 13 2 18 4 26 4...
Page 103: ...Blue Box 97 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 LE SIGMA 2002 LE DC MODELS 3 2 26 4...
Page 104: ...Blue Box 98 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 LE HP MODELS 3 2 26 4...
Page 105: ...Blue Box 99 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 LC MODELS 3 2 13 2...
Page 106: ...Blue Box 100 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 LC MODELS 14 4 26 4...
Page 107: ...Blue Box 101 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 LC HP MODELS 3 2 13 2...
Page 108: ...Blue Box 102 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 LC HP MODELS 14 4 26 4...
Page 109: ...Blue Box 103 REFRIGERANT CIRCUIT DIAGRAM SIGMA 2002 LC DC MODELS 3 2 13 2...
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