ACS 553, ACS 563 Service Manual
1 689 975 295 2021-04-13 Robert Bosch GmbH
Diagnostics and Testing
1. Check for proper power source and electrical
connectors for damage or corrosion.
2. Clear service hoses and remove them.
3. Disconnect unit from the power source.
4. Remove the front plastic cover.
5. Connect the unit directly to a known good
cord.
6. Check for 230 VAC to the compressor.
• If there is no voltage to the compressor’s
step.
• If voltage is present at the compressor,
replace the compressor thermal protector
and start relay assembly. If compressor
runs, verify the compressor amp draw is
within specs. If the compressor doesn’t
replace the compressor.
.
7. Check for 230 VAC from the power board
on connector P6, pins 1 and 2.
• When checking voltage to the compressor,
it is normal to read a low voltage at the
connector when it’s disconnected and the
• If voltage is present, check wiring between
the power board and the compressor start
components. Repair as needed.
• If voltage is not present, replace the
power board.
Perform functional check.
1. Disconnect unit from the power source.
2. Remove all three lines attached to the
compressor.
3. Unscrew the screws and remove the
compressor.
4.
5. Connect a manifold set to the compressor,
high side to the compressor discharge and
the low side to the suction port. Remove
hose from center port of manifold.
6. Close both valves on the manifold.
7. Connect the unit to the power source.
Enter the service menu, scroll to the Output
test and select the Compressor test.
ss00649
9. Start the compressor.
10. The first time the compressor is tested,
(100 psi) and 540 mBar (16 in-Hg).
11. Turn off the compressor and release
pressure from manifold.
give false compressor values due to embedded
refrigerant in the oil.
1. Close the valves on the manifold and start
the compressor.
2. A good compressor will produce 25 bar
(363 psi).
3. Release all pressure and vacuum from the
manifold set, close both valves and repeat
the test a third time to verify readings.
4. If the suction or discharge of the compressor
is under specifications, replace the
compressor.
5. Restore all the components as original.
6. Reinstall the front plastic cover.
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