Service Phases; Recovery - Bosch ACS 652 Repair Instruction

8.

Service phases

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This section describes all of the ACS 652 service
phases. In addition, it explains the hydraulic and
electric circuits by presenting the hydraulic diagram
and providing a brief description of the components
involved in each function.
8.1

Recovery

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In this service phase, the refrigerant is extracted
from the vehicle air conditioning system.
1. The ACS 652 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.
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By selecting the LOW and HIGH ports (through the
software) EVHP1, EVHP2, EVLP1, EVLP2, EV10 sole-
noid valves are opened and the coolant reaches EV9
EV8, EV1, EV3 (normally closed) solenoid valves and
is in contact with the P1 pressure transducer.
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The pressure sensor P1 checks the pressure of the
vehicle air conditioning system (whether or not there
is refrigerant in the vehicle air conditioning system).
3. starts extraction of the refrigerant.
 The solenoid valves EV10, EV3 and EV5 are
opened and the compressor (6) is started.
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The refrigerant flows through the solenoid valves
EVLP1, EVLP2, EVHP1, EVHP2, EV10, EV3 and EV5,
the mechanical filter (F1), the expansion valve (3),
and the condenser/separator (4).
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The expansion valve (3) maintains a constant pres-
sure at the evaporator/oil separator (4).
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In the evaporator/oil separator (4), the oil extracted
from the vehicle air conditioning system is separated
from the refrigerant and routed into the used oil
bottle (9).
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The refrigerant then flows on through the combo fil-
ter (F2) and the compressor (6) into the condenser/
separator (5), and finally into the internal refrigerant
cylinder.
Robert Bosch GmbH
Service phases | ACS 652 | 11
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The combo filter (F2) cleans the extracted refriger-
ant of suspended particles and moisture.
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In the evaporator/oil separator (5), the oil taken in
from the compressor is separated from the refriger-
ant and fed back to the compressor.
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If the pressure at sensor P1 falls below the value
saved in the software, the function stops automati-
cally, the program waits 5 minutes for a pressure
increase and, if necessary, restarts with a second
recovery cycle.
At the end of this phase, the solenoid valves EVLP1,
EVLP2, EVHP1, EVHP2, EV10, EV3 and EV5 are closed
and the compressor 6 is turned off.
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1 689 975 257 2019-05-15