Ugolini Mini GEL Manual De Servicio página 19

4 Connect the "VAC" filling unit on the pressure gauge to an appropriate and approved gas collection device.
WARNING
The refrigerant gas may be highly acidic and toxic.
5 Open the "Low" and "VAC" valves and collect the gas.
6 Once the discharge operation is complete, close the "Low" and "VAC" valves and disconnect the collection equipment.
9. 3 HOW TO EMPTY THE SYSTEM
Before emptying the system, always replace the dehydrator filter with a new one.
1 Connect the "REF" filling unit on the pressure gauge to the charging unit.
2 Connect the "VAC" filling unit to the vacuum pump and open the "VAC" valve.
3 Open the valve on the charging unit and, for a moment, also open the "REF" valve on the pressure gauge, to remove air from
the "REF" pipe.
4 In machines with more containers, disconnect the electrovalves from the machine's internal cabling and supply power to them
directly using an auxiliary power supply. This way, the electrovalves are open and the whole circuit is ready to be evacuated.
5 Open the "Low" valve on the pressure gauge and run the vacuum pump for approximately thirty minutes.
6 While the pump is operating, close the "VAC" valve on the pressure gauge once the preset level of emptying has been reached.
7 Switch off the vacuum pump.
8 Disconnect the electrovalves from the auxiliary power supply and reconnect the machine's original cabling.
9. 4 HOW TO CHARGE THE MACHINE WITH GAS
The "pressure gauge" shown in figure 5 is the type with 4 filling units (and 4 valves) because this type is most widely available on the
market, and it allows charging with gas both through the "High" and "Low Pressure" zones of the refrigerator circuit.
The refrigerator circuit on our machines is built so that the charging of gas may only be carried out through the compressor charging
tube ("Low Pressure" area): for this reason, the "HI" filling unit is not mentioned or used in our procedures and the "HI" valve should
therefore remain closed at all times.
1 Verify how many grams of gas should be decanted. This data, along with the type of gas, is indicated on the machine's
information plate.
2 Remove any containers and mixers from the machine.
3 Connect the machine's plug to a power supply and switch the master switch to the "I" position.
4 Switch all the "Mixer and Refrigeration" switches to the "I" position and wait until all electrovalves are open (only in multiple
machines) and the compressor starts up.
5 Open the valve on the charging unit.
6 Open the "REF" valve on the pressure gauge slowly and gently, so that the refrigerant is pushed into the circuit in gas form.
19