ACS 653, ACS 663 Service Manual
SP00D00624
2021-04-08
Robert Bosch GmbH
79
Electrical
Installing Replacement Scale Assembly
1. Install the scale into the unit fastening
securely with four nuts.
2. Connect the scale assembly wire to the
control board.
3.
Close and fix the front plastic dashboard
with 8 screws.
4. Screw back the screw and place the cap
(see Figure 1-15 in the Maintenance section).
5. Connect the unit to the power source.
6. Perform scale calibration.
Scale Calibration (Load Cells)
1. Switch the power on. The unit will verify
application loaders, files, and sensors
during the power up sequence and then will
display the amount of refrigerant available
in the internal tank.
2. Disconnect the liquid hose and vapor hose
from the tank.
3. Disconnect the electrical wires from the
air purge solenoid, tank liquid solenoid,
tank temperature sensor, and pressure
transducer.
4. Remove the bolts securing the tank to the
scale assembly.
5. Remove the tank from the scale and verify
there is no weight on the scale or anything
interfering with the operation of the scale.
6. Access the SERVICE MENU.
7. Enter password.
8.
Complete the necessary steps to select
CALIBRATE LOAD CELLS.
NOTE:
Calibration can be performed in Imperial
or Metric units. The unit of measure displayed
is determined at machine set-up.
9. Perform Calibrate Load Cells procedure in
the
Diagnostics and Testing
section.
10. Remove the weights and place the tank on
the scale.
11. Reconnect tank temperature sensor, air
purge solenoid, tank liquid solenoid and
pressure transducer wires.
12. Reconnect liquid and vapor hoses to tank.
13. Secure the tank to the scale with two bolts.
14. Reinstall the plastic frontal cover.
15. Attach the outside high- (red) and low-side
(blue) service hoses. Tighten at 7.9 Nm
torque.
16. Perform a functional test, check for leaks.
Replacement Scale Assembly
WARNING: Disconnect the unit from
the power source before beginning
service work. Incorrect use or
connections can cause electrical
shock.
WARNING: Wear safety goggles
when working with refrigerants.
Refrigerants can cause eye injury.
WARNING: Use extreme caution
when disconnecting hoses.
Pressurized refrigerant may be
present in hoses. Point hoses away
from you and anyone nearby.
WARNING: If scale assembly circuit
are not calibrated, the tank can
overfill, causing possible explosion
and/or vehicle overcharge.
Instructions
These instructions outline the steps to replace
the scale assembly. See Figure 3-10.
Removing Scale Assembly
1. Clear service hoses and remove them.
2. Disconnect unit from the power source.
3. Remove the front plastic cover.
4. Remove the cap nearby the usb ports and
remove the screw.
5.
Remove the 8 screws from the front plastic
dashboard and open it in order to access the
control board to disconnect the scale cable.
6. Disconnect the liquid hose and vapor hose
from the tank.
7. Disconnect the wires from the air
purge solenoid, tank liquid solenoid,
tank temperature sensor, and pressure
transducer.
8.
Remove the two bolts securing the tank to
the scale.
9. Remove the tank from the scale.
10. Remove the four nuts holding the scale in
place.
11. Remove the harness connected to the
control board.
12. Remove the scale.
