1 689 975 257 2019-05-15| Robert Bosch GmbH
24 | ACS 652 | Emptying the ACS 652en
10. Emptying the ACS 652
! When repairing internal components, we recommend
extracting the internal hoses on the ACS 652 to
ensure that no refrigerant can escape when the hose
lines are opened.
i This extraction is carried out by automatic emptying
or, if there is a technical defect, by using a second
A/C service unit.
Warning – Risk of frostbite from escaping
refrigerant
Refrigerant causes severe frostbite on the
skin.
¶ Check the service hoses for damage.
¶ Firmly connect the service quick-release
couplings to the service hoses.
¶ Wear safety goggles.
¶ Wear protective gloves.
10.1 Automatic emptying
i Refrigerant in the internal hoses is extracted into the
internal refrigerant cylinder.
1. Service hoses (T1, T2) are not connected to the
vehicle.
2. Close service quick-release couplings.
3. Start recovery.
"Automatic emptying is performed.
10.2 Extraction of internal refrigerant cir-
cuit with second A/C service unit
i If recovery cannot be performed due to a defective
compressor, a second A/C service unit or an external
compressor is required to remove the refrigerant
from the internal refrigerant circuit. To do this, start
the "Recycle" function to open the corresponding
solenoid valves.
i The compressor power supply for the ACS 652 must
be disconnected before extraction.
1. Close shutoff valves V1, V3, V2, and V4 on the re-
frigerant cylinder and disconnect the blue and red
hoses from the refrigerant cylinder.
2. Connect the blue hose to the low pressure side of
the second A/C service unit.
3. Connect the red hose to the high pressure side of
the second A/C service unit.
4. Open the valves V1 and V2.
5. Open both valves on the second A/C service unit and
recover the refrigerant from the first, defective A/C
service unit.
A pressure increase test is performed at the end
of recovery.
6. Close the two valves on the second A/C service
unit and disconnect the hoses from the refrigerant
cylinder.
"Repairs can be performed.
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