The data, information and descriptions, and the technology described herein are the exclusive intellectual property of Snap-on Climate Solutions S.r.l. and
constitute industrial secrets. Said information is communicated in strict confidentiality; said information may be used only for the purpose for which it is
communicated; said information may not be divulged, communicated, or revealed to third parties and/or reproduced by any means for any reason whatsoever; said
information is protected under applicable Italian competition and industrial property law.
Service manual Cinquecento12 (VA21) [MANUY2V.SB0] ed.1 ver.0.1.doc pag.34 - 09/11/2021
OPERATING CYCLE
The operating cycle is divided into three distinct phases: the recovery-recycling phase with the
automatic draining of used oil, the vacuum phase, the oil and refrigerant recharging phase.
These phases can be carried out automatically by the machine in a single operation, without
the need for operator intervention.
If the automatic procedure is selected, the machine will ask the operator to enter the following
data:
vacuum time
oil reintegration method (automatic or manual)
quantity of refrigerant to be reintegrated
at this point the recovery operation can begin: the machine recovers all the refrigerant from the
system, drains the oil and weighs it using the scale provided, evacuates the system and
reintegrates the preset amounts of oil and refrigerant and an acoustic alarm is sounded for the
end of the service.
RECOVERY- RECYCLING PHASE
After carrying out the necessary connections to the vehicle’s air conditioning system and
selecting the phase, if gas is present the machine will begin recovery. There follows a detailed
description of the system. during this phase the EV3 solenoid valve is open, and the
compressor and electric fan are also in operation. For this to occur, it is necessary that the gas
pressure, visible on the manometer, is sufficient (+0.5 bar) to close the electrical contact at the
A/C pressure switch connected to the distributor. Under these conditions, the flow arriving from
the air conditioning system through the mechanical filters, which retains any solid residue,
reaches the evaporator after passing through the EV3 solenoid valve.
From the evaporator, the gas moves past the check valve n°1 and the low pressure filter (11)
until it reaches the compressor. The filter mentioned is a high capacity dehydrating filter
(between 10 and 12 ppm per kg of refrigerant in relation to the type of refrigerant and the
temperature of the fluid).
When it leaves the compressor the refrigerant, in a superheated vapor state, arrives at the
separator. In its new configuration this cylindrically-shaped component has three connectors on
the upper part, with a safety pressure switch connected to one of them. This is normally closed
and will open the electrical contact, disconnecting the power supply to the compressor, if the
delivery pressure of the compressor should exceed around 20 bar. The compressor is a 12 cc
displacement reciprocating compressor and has three connections: on one side are the suction
and delivery connections, on the opposite side is a connection used for returning the oil from
the separator.
There follows a detailed description of the separator: during compressor operation obviously
part of the oil enters into circulation with the refrigerant, therefore it is necessary to make sure
that this oil returns to the compressor so that its functionality is not compromised. In
correspondence with the central connector, the separator has a pure borosilicate coalescent
filter with over 99% efficiency, which causes the oil molecules to coacervate as an effect of the
excitation produced by passing over the filter. In this way, gravity causes the drops of oil to
deposit on the bottom of the bottle and then return to the compressor, at the end of the
recovery phase, when the EV6 solenoid valve is opened.
After coming out of the separator, the superheated gas goes through the check valve n°2 and
returns to the evaporator. When it comes out of the evaporator, the refrigerant goes to the
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