Replacing The Temperature Sensor On The Cylinder - Bosch ACS 751 Repair Instructions

9.4 Replacing the temperature sensor on
the cylinder
1
2
Fig. 28: Overview of temperature sensor assembly
1 Temperature sensor
2 Positioning nut
1. Perform hose drain.
2. Switch off the ACS 751/651.
3. Open the right panel and the rear panel (see chap-
ter 6.3, 6.4).
4. Close the LP valve (Fig. 27, Pos. 2) on the internal
refrigerant cylinder.
5. Remove the spiral from the tank hoses.
6. Remove the LP hose connection on the cylinder side.
i
Some refrigerant might escape when the LP hose is
removed. It is recommended to wear safety gloves
Risk of frostbite!
A small quantity of refrigerant might
escape when the LP hose is disconnected
from the cylinder.
¶
Wear safety gloves.
7. Connect the LP hose from manifold (Fig. 27, Pos. 1)
to the external cylinder and open the LP (blue) valve
on the external cylinder.
8. Start the ACS 751/651 in debug mode.
9. Select CTRL, RE, HL, IN, CX and FA.
10. Monitor the PST (mbar) and R134a (g) values.
11. Deselect CTRL, RE, HL, IN, CX and FA when the
PST pressure reaches zero mbar and the value of
R134a reaches approximately 1000 g.
12. Select CXOL for 30 seconds at the end of the
process.
? The internal cylinder is now empty.
Robert Bosch GmbH
Refrigerant cylinder | ACS 751/651 | 27
13. Disconnect the electrical connection to the tem-
perature sensor (Fig. 28, Pos. 1).
14. Hold the positioning nut (Fig. 28, Pos. 2) of the
temperature sensor and loosen the temperature
sensor. Detach the temperature sensor from the
cylinder.
15. Assemble the new temperature sensor to the po-
sitioning nut. Using Loctite 577, fasten the entire
assembly to the cylinder.
16. Connect the electrical connection to the tempera-
ture sensor.
i
Ensure that the hoses are routed in the correct
orientation and do not touch the panels or other
internal parts.
17. Connect the LP hose from the manifold to the
Y-valve of the internal refrigerant tank. Use Loctite
577 to connect the hoses.
18. Bind the tank hoses with the spiral.
19. Open the LP valve on the Y-valve of the refrigerant
cylinder.
20. Close the right and rear panels.
"
The temperature sensor is replaced.
ACS 751/651 | 27 | 27 en
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1 689 975 223 2013-10-21