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Service manual Cinquecento12 (VA21) [MANUY2V.SB0] ed.1 ver.0.1.doc pag.35 - 09/11/2021
condenser where it completely passes to a liquid state, transferring heat to the air flow
produced by the electric fan.
Finally, we arrive to the bottle through the vapor side valve.
The recovery phase shuts down with the de-energizing of EV3 when the pressure switch
reaches a pressure of –0.3 bar, the EV7 valve is automatically opened to drain the used oil,
and the electronic valve EV6 for the return of the oil of the compressor.
VACUUM PHASE
At the end of the recovery phase there is an interval of around 4 minutes during which any gas
returning from the system will result in the recovery phase being immediately restarted.
Otherwise the vacuum phase will automatically begin. During this air and non-condensable
gases can be evacuated through the vacuum pump. The vacuum pump is a single stage
model.
The vacuum phase can also be selected from the keyboard as long as the air conditioning
system has been completely discharged. The vacuum phase will only start under these
conditions, otherwise the machine will sound an acoustic alarm and it will be necessary to
begin from the recovery phase.
FIlLING PHASE
Once the vacuum phase has concluded, the machine will carry out the recharging of new oil
and refrigerant. The new oil in the container, passes through the EV12 solenoid valve, the
check valve n°3 and reaches the distributor where there is a vacuum.
At the end of the oil refilling the electronic valve EV12 is closed and the EV8 solenoid valve is
energized, the refrigerant flows from the bottle to the distributor and then into the air
conditioning system, where there is a vacuum, by simply making use of the pressure difference
between the bottle and the system.
Once the required weight has been reached, the EV8 solenoid valve closes, blocking the flow
of refrigerant from the bottle.
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