Will Not Recover; Will Not Drain Oil - Bosch ACS 553 Service Manual

Diagnostics and Testing

Will Not Recover

NOTE: The compressor should be running
during this test. If it does not run, refer to
Compressor troubleshooting in the Compressor
section of this manual.
1. Verify there is pressure reading on the
gauges.
• If pressure is present, the service hoses
are connected correctly.
• If pressure is absent, the service hoses
are connected improperly or there is a
restriction. Clear and reconnect service
hoses.
2. Display the accumulator pressure (enable
"display title info" in maintenance menu).
• If there is no pressure, inspect inlet
valves, recover solenoid, and check
valves.
• I f p r e s s u r e s e e m s n o r m a l a t t h e
accumulator, inspect oil return solenoid
(S13), and compressor.
NOTE: The recover solenoid (S11) is controlled
to maintain a maximum of 2.5 bar (35 psi) in
the accumulator.
3. Verify operation of the recover check valve.
Replace as needed.
4. Check the compressor for suction and
discharge performance.
5. Remove the filter and inspect all fittings
and gaskets to verify that no obstructions
exist. Replace/repair gaskets as needed
and reinstall filter.
6. Verify the accumulator transducer is
functioning properly by attaching a calibrated
gauge to the service port and compare
readings to those on the manual gauge.
T h e r e a d i n g s s h o u l d b e w i t h i n t h e
specifications on the transducer ID plate.
7. Check the oil return (S13) solenoid for
bleed-through and proper operation. Repair
as needed.
8. Check Tank Liquid solenoid (S7) for debris.
9. If problem still exists, check the vacuum (S9)
solenoid, as applicable.
NOTE: If the compressor fails to operate, refer
to Compressor Troubleshooting.
1 689 975 295 2021-04-13
ACS 553, ACS 563 Service Manual

Will Not Drain Oil

1. Verify the accumulator transducer is
functioning properly.
2. Is an Oil Drain Error Message displayed?
• Oil drain halted. Pressure error. Retry
or exit?
a. Verify operation of the compressor
oil return solenoid (S13) (check the
power board and control board).
b. Check there is enough pressure in
the Tank.
c. Verify the oil drain solenoid (S8) is
receiving power and opening properly.
d. If not receiving power, check the
continuity of the wiring between
solenoid and power board. Repair
as needed.
e. If the oil drain solenoid is receiving
power and is opening, verify the oil
drain line isn't plugged.
f. If the wiring is correct and no power is
being applied to the solenoid, replace
the power board.
g. If the unit continues to drain oil for few
minutes, Oil Drain Error will display.
The accumulator may be filled with oil
that must be drained manually.
h. Check the hose between oil drain
solenoid (S8) and oil drain bottle is
free.
NOTE: Determine the reason the oil separator
isn't draining properly. Improper draining could
be caused by a faulty component or improper
operation by the user. Access the maintenance
counters in the service menu. Comparing the
recover cycles to the oil drain cycles may
indicate user operational errors.
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Robert Bosch GmbH