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System maintenance
All routine and non-routine maintenance activities on the machine must be carried out solely by qualified personnel
who are familiar with the machine characteristics, operation and maintenance procedures, and who are aware of the
safety requirements and risks involved.
It 's absolutely forbidden to remove all the protections of the moving parts of the unit
The causes of repeated shutdowns deriving from triggering of safety devices must be investigated and corrected.
Re-starting the unit after simply resetting the alarm can seriously damage the equipment.
A correct refrigerant and oil charge is essential for optimal operation of the machine and for environmental protection.
Any oil and refrigerant recovery must conform to legislation in force.
General
Besides the checks suggested in the routine maintenance program, it is recommended to schedule periodical
inspections, to be carried out by qualified personnel, as follows:
4 inspections per year (every three months) for units running about 365 days per year;
2 inspections per year (1 at seasonal start-up and the second one in the middle of the season) for units running about
180 days per year with seasonal operation.
1 inspection per year 1 (at seasonal start-up) for units running about 90 days per year with seasonal operation.
The manufacturer of the unit requires users to have a complete check on the unit and on the state of the pressurised
refrigeration circuits carried out after ten years of use, in compliance with Italian law (Lgs. Decree 93/2000), for all
groups belonging to categories I and IV, containing fluids of group 2.
The manufacturer also recommends that all users analyse compressor vibrations annually and make routine
inspections to check on possible refrigerant leaks. These checks ascertain that the refrigeration circuit is intact and
safe and must be carried out according to local and/or European laws by personnel holding the qualifications required
by such laws.
Compressor maintenance
The analysis of vibrations is a good method for verifying the mechanical conditions of the compressor.
Verification of vibration readings immediately after start-up and periodically on an annual basis is recommended. The
compressor load must be similar to the previous measurement's load to ensure measurement reliability.
Lubrication
The units do not require a routine procedure for lubrication of components.
Compressor oil is of the synthetic type and is highly hygroscopic. It is therefore advised to limit its exposure to the
atmosphere during storage and filling. It is recommended that the oil be exposed to the atmosphere for no more than
10 minutes.
The compressor oil filter is located under the oil separator (delivery side). Its replacement is advised when its pressure
drop exceeds 2.0 bar. The pressure drop across the oil filter is the difference between the compressor discharge
pressure and the oil pressure. Both these pressures can be monitored through the microprocessor for both compressors.
WARNING
WARNING
WARNING
WARNING
IMPORTANT
IMPORTANT
D–EIMWC00508-16EN - 31/48
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