CAP. 12 - MANUAL CYCLES 50 / 73 ENGLISH
12.5 FLUSHING (with optional accessories)
After performing a lot of recharge cycles or after replacing components or parts of the /AC circuit
on a vehicle it is advisable to carry out a system flushing.
The system washing (Flushing) consists in purifying the vehicle cooling system through several
R134a or R1234yf gas flushes, by recovering it each time, so that the impurities can be filtered
little by little through the additional filter.
Thanks to its specific design, MULTIGAS 9000 PLUS can automatically manage the flushing
process so that the process becomes fully automatic.
2 flushing modes are available: STANDARD and FLUSHING KIT VAS (both with optional external
kits).
Once the (optional) flushing kit has been installed, as described in the instructions included in the
kit, and after selecting the specific function for the kit being used, start the phase, setting the
desired flushing time
In case of problems or errors during this phase, a message will be displayed, identifying the type
of error.
It is possible to interrupt the phase in progress at any time, by pushing the icon
.
12.6 PRESSURE CHECK (EXCLUDING BUSES)
The pressure check requires the engine to be started once the service equipment has been
connected to the vehicle.
Before proceeding, refer to the original technical documentation to determine whether this is
allowed by the vehicle's manufacturer, and for any safety and operational precautions.
We give an example of a pressure check procedure below.
To check the condition of the vehicle's A/C system, for example if cool air does not come out of
the ports, you can check the system pressures. Connect the HP (High Pressure) – LP (Low
Pressure) couplings or single coupling to the vehicle’s A/C system. In the main menu select
MANUAL CYCLES and then PRESSURE CHECK. Open the couplings (or coupling) by turning the
taps on the service couplings.
With the engine off:
• check that the quick couplings are properly connected;
• check that the hoses cannot interfere with moving parts and are not in contact with hot or
live parts or fluid systems;
• check that no persons, animals or foreign objects are close to or inside the engine
compartment;
• make sure no gears are engaged.
Start the engine and set the A/C system as follows:
• Start up A/C system (refrigerant compressor ON).
• Set minimum temperature on selector.
• Set fan to next to maximum setting, close all nozzles except for the central one and set air
delivery to centre.
• Run the engine at around 2500 rpm.
• Check the pressure values after about 3 - 5 minutes and verify whether the pressure
gauge readings are in the coloured sectors or at the manufacturer's recommended values.
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