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Maintenance
RNING
General
The maintenance operations are essential to maintain the efficiency of the refrigeration unit, both from a purely
functional and energy consumption. Each unit is equipped with a booklet on the unit, which will be provided by the user,
or the person who is authorized on his behalf to the maintenance of the unit, return all records required in order to keep
a historical record of the operation of the unit. The lack of records in the booklet will serve as evidence of poor
maintenance.
Sight check of the under pressure vessels state
The risks due to the pressure inside the circuit have been eliminated or (when it is not possible) reduced by means of
safety devices. It is important to check periodically the status of these devices and to carry out the components inspec-
tions and repositioning as follows.
Check at least once per year the under pressure vessels state.
It is important to check that the surface does not get rusty and that neither corrosion nor deformations are visible.
In case the superficial oxidisation and the corrosion are not properly controlled and stopped in time, cause a thickness
reduction with a consequent reduction of the vessel mechanical resistance.
Use antioxidant paint or products to protect.
Control of compressor oil level
Control of the suction temperature (superheating)
Control of the hydraulic circuit water filling
Control of electric absorption fan motors and compressor
Control of power supply and auxiliary power
Control of refrigerant charge through liquid sight glass (if available)
Control of the state of the carter electric heaters
Carrying out tightening of all the electrical connections
Coil cleaning
Control of the functioning of the compressor solenoid valves and liquid line
Control of the setting of the regulation and safety thermostat
Control of the state of the fan and compressor contactors
Functional test of the evaporator heater
Noise control of the engine and fan bearings (if available)
Pressure tank state checking
Description of the operations
Recommended
frequency
monthly
monthly
monthly
monthly
monthly
monthly
monthly
monthly
monthly
seasonal
quarterly
quarterly
quarterly
seasonal
yearly
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