ENGLISH 69 / 78 CAP. 15 - REPLACEMENT INTERVENTIONS
15.2 EXTRAORDINARY MAINTENANCE
15.2.1 Replacement of components connected to refrigerant circuit
The equipment contains parts subject to directive PED Pressure Equipment Directive 97/23/EC.
The components (pressurised equipment) constituting/connected to the refrigerant fluid circuit
through permanent junctions, such as sealing or brazing, can in no way be disassembled,
replaced, changed or handled.
Before each check and/or replacement intervention of components inside the machine it is
recommended to firstly carry out the following operations:
Apply the 2 pipes in the supports on the side of the machine and close the taps counter
clockwise.
1. Switch off the machine, remove the power supply cable and open the cover and the front
panel.
2. Close central tap (liquid side) of the tank with service kit key (about 7 clockwise turns)
3. Reconnect the power supply cable, turn on the machine (do not touch terminals or printed
circuit boards)
4. Open the service menu
5. Select manual activations
6. In manual activations activate OUT R, OUT I, OUT A, C, wait for the LP gauge to show a
pressure of at least - 0.4 bar,
7. Switch off the machine and remove the power supply network cable
In case of replacement of pipes equipped with o-rings, use Loctite® 577 thread locker and
replace the internal o-ring.
In case of replacement of pipes without o-ring, insert the lubricated copper washer.
It is recommended to not disperse the refrigerant in the atmosphere.
If it is necessary to provide for emptying of the internal tank, you have to carry out refrigerant
recovery with a second machine, after having interconnected the equipment with the HP pipe and
having placed the machine to empty with the open tank and open OUT R valve.
Alternatively, it is possible to disconnect the inlet to the tank on the gas side by connecting the
pipe to an external tank to fill and by activating OUT R, OUT I, OUT A, C until obtaining a tank
pressure of about -0.4 bar,
15.2.2 Replacement of logic electronic board with display
After having excluded any problem regarding software, power supply, fuses on the switch block,
connection cables, faults in the power board, running out of the clock battery, faults in the micro
SD card, faults in the sensors, replacement is required in case of:
• Impossibility to correctly complete card programming.
• Incorrect display operation
• Block in the acquisition and display of the analogue signals not caused by faults in the
sensors or by a miscalibration.
• Incorrect activation of command relays.
• Wrong indications of the internal clock not due to lack of adjustment or running out of
battery.
• Evident damage to board components and circuits.
For the replacement of the board it is recommended to position the new board alongside the one
to be replaced. Disconnect and reconnect the cables in sequence one by one:
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