Depressurizing The Unit; Unit Is Functional; Unit Is Not Functional - Bosch ACS 753 Repair Instructions

Diagnostics and Testing
WARNING: Contact with refrigerant can cause eye injury. Always wear safety
goggles when working with refrigerants. Disconnect lines and hoses with extreme
caution! Pressurized refrigerant may be present in lines and hoses. Always point
lines and hoses away from you and anyone nearby.
WARNING: Always unplug the machine from the power source before removing
any of the shrouding or beginning any service work.

Unit is Functional

1. Perform recovery function.
2. Turn unit off when Oil Draining is displayed.
3. Refrigerant will be present in the vapor
hose, liquid hose, and accumulator.
To evacuate the tank:
1. Connect an external recovery unit to the
lateral contamination port (ACS 863 only)
or by quick coupler adapter connection.
2. Open service menu and goes into Output
test. Refer to Output test in the Diagnostics
and Testing section.
3. Enable:
• Tank liquid solenoid S22,
• Low-Side Charge Solenoid S7 and/or,
• High-Side Charge Solenoid S6.
SP00D00609 2018-03-26

DEPRESSURIZING THE UNIT

ACS 753, ACS 763, ACS 863 Service Manual

Unit is Not Functional

1. Disconnect the high- and low-side service
hoses from vehicle or service tank, whichever
is applicable. Make sure the coupler valves
are closed.
2. Connect an auxiliary recovery unit to the
lateral contamination port (ACS 863 only)
or by quick coupler adapter connection.
3. Start the separate recovery unit and allow
it to pull the unit into a 0.4 bar (33 cm-Hg)
vacuum.
4. When the unit is pulled down to this level,
turn off the auxiliary recovery unit and
disconnect from the lateral contamination
port (ACS 863 only) or by quick coupler
adapter connection.
5. Carefully disconnect or remove components
as there may be refrigerant present.
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Robert Bosch GmbH