Will Not Fill Tank; Will Not Perform Clearing - Bosch ACS 561 Repair Instructions

ACS 561 Service Manual

Will Not Fill Tank

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. Check the tank fill setting and the tank tare
setting.
2. Verify the low-side hose is properly con-
nected and threaded completely onto the
source tank fitting. Check quick-seal on tank
fill hose and make sure virgin tank valve is
open.
3. Verify there is liquid refrigerant in the tank
and the tank is positioned to supply liquid
refrigerant to the low-side hose. Inverted for
a disposable tank or attached to the liquid
port on a refillable tank.
4. Verify the liquid port solenoid (S4) is receiv-
ing power and opening properly.
The recover solenoid (S1) is controlled
to maintain a maximum of 35 psi in the
accumulator.
5. Monitor accumulator pressure. If reading
is low, check restriction up stream of the
accumulator. If pressure is normal, check
compressor, oil return solenoid (S7) and
discharge check valves.
6. Check the charge (S3), recover (S1), oil
return (S7), and oil drain (S6) for bleed-
through. Repair as needed.
7. Verify the operation of the tank fill and nor-
mal/discharge check valves. Replace as
needed.
8. Check the clearing discharge check valve
for bleed-through. Replace as needed.
9. Check the compressor for suction and dis-
charge performance. Refer to Compressor
Testing procedure in this section.
10. Remove the filter and inspect all fittings
and gaskets to verify that no obstructions
exist. Replace/repair gaskets as needed
and reinstall filter.
11. Verify that the scale is calibrated and free
to move.
Robert Bosch GmbH
Diagnostics and Testing

Will Not Perform Clearing

The compressor should be running
during this test. If it does not run, refer
to compressor troubleshooting in the
Compressor section of this manual.
Basic Recovery Sequence
1. Low-side clear to 4 mBar (4 in-Hg)
2. High-side clear to 304 mBar (9 in-Hg)
3. Recovery
4. Clear to 4 mBar (4 in-Hg)
Service Tech Actions
1. Recover the hoses to verify customer claim.
2. Verify valve on external source tank is
closed.
3. Place hand on compressor to be sure it is
running.
4. Turn power off.
5. If unit completed recovery with source tank
valve closed, but did not complete with valve
open, replace liquid port solenoid (S4) and
try again.
Verify Transducers
1. Make sure the transducers are wired cor-
rectly and at the control board.
2. Check the range listed on the accumulator
transducer label. It should read "0-10 Bar"
("0-150 psi").
Verify Solenoids
1. Inspect all solenoids for correct wire num-
bers.
2. Check oil return solenoid (S7) to be sure it
is not backward.
Ports are stamped 1 and 2. Port 1 is
OUT, Port 2 is IN.
Verify Transducers are Reading Correctly
1. Attach a calibrated compound gauge to the
accumulator service port.
2. Turn power on.
3. Enter vacuum mode and pull vacuum for
one minute on service hoses.
4. Enter the service menu and turn on Display
Pressures.
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SP00D00517 2018-07-11