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For the purposes of the A/C system recharging procedure, the important differences are those relating to the type of refrigerant (R134a/HFO1234yf) and/or to the type of compressor (electric in hybrid / electric cars, mechanical on other cars). The differences between compressor types (variable / fixed compressor displacement) or the type of system (with expansion valve / orifice) do not affect the service procedure.
Our units include all needed functional accessories. To start servicing a car, however, it is necessary to add a certain amount of refrigerant into the unit (2-3 kg min) - to do this you need: gas cylinder R134a or HFO1234yf with its adapter to connect with the quick coupling - and it is necessary to fill the oil and dye containers of th service unit
Apart, obviously, from checking the type of refrigerant and the type of compressor used (R134a or HFO1234yf, internal combustion engine or electric / hybrid), it is recommended to connect the charging hoses to the car to check the pressure indicated by the service pressure gauges. In the event of a total absence of pressure, the presence of a leak in the system is highly probable and it is therefore necessary, before performing the refill, to locate and repair the leak. In the particularly cold months, it may be useful to heat the A/C system by starting it for 5-10 min. (recharging to be carried out with the engine off).
No. Except for particular conditions, it is necessary to carry out a vacuum lasting at least 25 minutes or more (depending on the capacity of the A/Csystem) .The vacuum phase, in fact, is important, as well as to detect any leaks as well as to dry completely the A/C system .I addition, during the vacuum cycle the refrigerant pressure in the internal tank is rised by means of the tank heater. All of these procedures need a minimum of time.
The oil in the A/C circuit is subject to consumption. Therefore, both the quantities of oil recovered during the maintenance itself and those destined to replenish the presumed consumption must be taken into consideration. In the absence of indications from the manufacturer of the AC system, it is therefore advisable to set a quantity corresponding to the oil possibly recovered with the addition of 10g (presumed consumption).
The presence of dye in the A/C system allows the identification of a leak when the system is filled with refrigerant. For example, to check a car, previously loaded with dye, upon arrival at the workshop. When the system is empty, as an immediate leak detection system, the use of the tracer is not recommended because, together with dye, it is necessary to charge a minimum amount of refrigerant. For environmental (R134a) or cost (HFO1234yf) reasons this solution has been progressively abandoned and replaced by systems such as the detection with forming gas and an electronic leak detector.
No. The AC systems are designed to work with the indicated refrigerant quantity, with a tolerance of +/- 30 or 10g depending on the system. Any variation on the recommended amount produces negative effects.
The technical data of a car's A/C system are indicated on a specific plate in the engine compartment and include, among others, the recommended amount of refrigerant, any tolerance on the amount, the type of refrigerant, the type of oil to be used. If there is no plate, the service unit is equipped with a large internal database which allows automatically to select all the necessary parameters.
Example of technical data plate:
If the recharge has been carried out correctly, it is not strictly necessary but it is advisable to check the actual operation of the A/C system after the service procedure. In addition to identifying malfunctions of the system, not related to the correct charging, in fact, this practice allows us to offer a truly complete and professional service.
