Replacement Scale Assembly; Scale Calibration (Load Cells) - Bosch ACS 553 Service Manual

ACS 553, ACS 563 Service Manual

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
w h e n d i s c o n n e c t i n g h o s e s .
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 3-9.
Removing Scale Assembly
1. Disconnect unit from the power source.
2. Remove the front plastic cover.
3. Remove the four screws under the control
panel.
4. Tilt the control panel upwards the front
of the unit to access the control board to
disconnect the scale cable.
5. Close the red and blue tank valve.
6. Disconnect the liquid hose and vapor hose
from the tank.
7. Disconnect the wires from the air purge
solenoid and tank temperature sensor.
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.
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.
Robert Bosch GmbH
3. Tilt the control panel down and secure with
four screws.
4. Connect the unit to the power source.
5. 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 and tank temperature sensor.
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 sample weights and place the
tank on the scale.
11. Reconnect tank temperature sensor and air
purge solenoid wires.
12. Reconnect liquid and vapor hoses to tank
and open the tank valves.
13. Secure the tank to the scale with two bolts.
14. Reinstall the front plastic cover.
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Figure 3-9. Scale Assembly
67
Electrical
CBP8
1 689 975 295 2021-04-13