51
18.01._5280107_02
NRL 0280-0750 °-L / A-E
EN
1 we do not recommend swabbing as it can ruin the inner lining of the pipes, we recommend using appropriate chemicals
RECOMMENDED PERIODIC MAINTENANCE INTERVENTIONS
DESCRIPTION
FREQUENCY
3/4
months 6 months
12
months
24
months
functioning hours
GENERAL INTERVENTIONS
Check of any refrigerant leaks (this must be done respecting the deadlines recommended by
the current European regulations)
•
Check of the unit power supply voltage
•
Check of the compressors' power supply voltage
•
Check of the fan power supply voltage
•
Check of the solenoid valves
•
Functioning and calibration check of the pressure switches, if and where present
•
Replacement of the safety valve
•
Check and reading of the pressure/temperature probes
•
Check and possible replacement of the dehydrating fans
•
Check of compressors contactors
•
Check of fans contactors, where present
•
Exchanger coils cleaning
•
Check and cleaning of shell and tube heat exchangers if necessary where present
(1)
•
Check of electric resistances of the heat exchangers
•
Check for rust and corrosion in components, paying particular attention to under pressure
containers. In this case replace them of intervene with specific products
•
General cleaning of the unit
•
Bleed the hydraulic circuit and the heat exchangers, the simultaneous presence of air and
water reduces yield and can benefit the arising of rust
INTERVENTIONS TO COOLING CIRCUIT Functioning at full load
Overheating temperature measurement
•
Subcooling temperature measurement
•
Exhaust gas temperature measurement
•
Fans absorption measurement
•
Compressors absorption measurement
•
COMPRESSOR CHECKS
Check oil level
•
Check oil acidity
•
Oil replacement
compressore vite 8000 ore
compressore scroll 12000 ore
Check the proper functioning of the casing resistance
•
Check oil level sensor, if any
•
CHECKS ON HYDRAULIC CIRCUIT
Pumps absorption measurement
•
Check the pump rotor gasket
•
Check the flexible joints
•
Check the seal of the shell and tube heat exchanger heads, where present
•
Check the proper functioning and calibration of the flow switch, where present
•
Check the proper functioning of the differential pressure switch, where present
•
Check the concentration of glycol solution, if provided
3 months*
Cleaning the water filter
•
The frequency of the operations described herein is a guideline one and they may vary depending on how the unit is used and the type of system where it
is installed. However, if the unit is installed in harsh environments, we recommend reducing the time of intervention
* To replace the glycol, refer to the documentation provided by the supplier.
18.
MAINTENANCE - LIST OF THE RECOMMENDED PERIODIC INTERVENTIONS
