Vacuum Phase And Recycling (Simultaneous); Vacuum Phase; Recycle - Bosch ACS 511 Repair Instruction

en 14 | ACS 511 | Service phases
8.3 Vacuum phase and recycling
(simultaneous)
8.3.1

Vacuum phase

i
During vacuum generation in the vehicle air condi-
tioning system, the refrigerant is prepared in the
internal refrigerant cylinder to remove the non-con-
densing gases before filling and to filter the refriger-
ant.
1. The ACS 511 is connected to the vehicle with the
service hoses T1 and T2.
2. Open the service quick-release coupling valves.
 The pressure on the high and low pressure side of
the vehicle air conditioning system is indicated on
the pressure gages M1 and M2.
i
Opening the HP and LP valves on the ACS 511
causes the refrigerant to flow to the pressure sensor
P1 (solenoid valves EV1, EV3, and EV10 are closed).
P1 checks the pressure in the vehicle air condition-
ing system (refrigerant present in the vehicle air
conditioning system or not).
i
If the pressure in the vehicle air conditioning system
is below the set value, the vehicle air conditioning
system is empty and the ACS 511 starts vacuum
generation.
i
If the pressure is above the set value, there is still re-
frigerant in the vehicle air conditioning system, and
it must be extracted before vacuum generation.
3. Press the <Vacuum> key.
 EV1 and EV10 are opened and the vacuum pump
(2) starts.
i
The vacuum pump generates a maximum vacuum of
0.05 mbar. This depends on the duration of vacuum
generation.
i
The refrigerant in the internal refrigerant cylinder is
fed through the internal refrigerant circuit and pre-
pared in each vacuum phase.
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8.3.2

Recycle

i
During the vacuum function, the refrigerant recycle
starts automatically to further improve its purity
before the recharge.
i
Some seconds after the vacuum stage has started,
the ecu excites the EV5 and EV6 solenoid valves by
opening them and starting compressor 6.
i
In that way, refrigerant is sucked from storage bottle
7 and is conveyed through the filter F1, the expan-
sion valve 3, the still/separator 4 until reaching the
tank again, as it happens in the recovery stage.
i
This function favours the automatic discharge of non
condensable gases inside the storage bottle.
Robert Bosch GmbH