ACS 653, ACS 663 Service Manual
SP00D00624 2021-04-08 Robert Bosch GmbH
20
Introduction
This function is available on Maintenance menu.
To ensure a safe, environmentally friendly,
and economic operation, the unit performs a
software-controlled self-test in regular intervals
every 10 days (for R1234yf only).
1. Follow the on-screen prompts to connect
the hose service couplers to the storage
connectors on the side of the machine.
Open the hose couplers by turning the
collars clockwise.
2. Select icon to start the test.
3. The machine performs a self-recovery and
displays:
RECOVER IN PROGRESS
4. The machine performs a 30-second vacuum
test and displays:
VACUUM CHECK IN PROGRESS
• If the vacuum test fails, the machine will
prompt to check for leaks.
5. Once the machine passes the vacuum test,
a controlled pressure is applied to its internal
components. The machine displays:
PRESSURE CHECK IN PROGRESS
6. Pressure is held for five minutes and
monitored for decay. There is not a default
pressure value. The machine monitors the
pressure reached during the pressurization.
Minutes and seconds count down on the
display.
• If an acceptable pressure decay is detected,
the machine recovers refrigerant until
-0,44 bar and returns to the Maintenance
Menu, ready for normal operation.
• If an unacceptable pressure decay is
detected, the machine will prompt to
check for leaks. Take the machine to an
authorized service center for repair.
Leak Check may also be selected at
any time from the Maintenance Menu. If you
decline to run the Leak Check when prompted,
the machine will continue to prompt for the test
at each power-up until the test is completed
(for R1234yf only).
Never leave the machine live if an immediate use
is not scheduled. To ensure that unauthorized
personnel cannot run the machine, use the
Lockout as shown in Figure 1-10.
1. Turn the Lockout lever (1) counterclockwise
(CCW).
2. Insert a padlock or other item through the
aligned holes so the lever cannot be turned
clockwise (CW) to start the machine.
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