Component test and maintenance | ACS 810 | 27 | en
1 689 975 253 2021-01-26| Robert Bosch GmbH
12. Component test and
maintenance
12.1 Vacuum pump
! The vacuum pump oil must always be changed after
30 hours of operation.
Property Value/range
Operating voltage 230 VAC ± 10 %
Frequency 50/60 Hz
Vacuum pump oil filling capacity 590 ml
Output 283 l/min
Max. vacuum 0,033 mbar
To check correct operation of the pump, carry out the
following steps:
1. Check the oil level in the vacuum pump.
i The oil level should be in the middle of the
sight glass between the "full" and "empty" marks.
2. Attach pressure gage to intake connection.
3. Start vacuum generation.
" A vacuum of 0,033 mbar must be achieved.
12.2 Pressure sensor P1
1. Check whether a voltage of 24 Volt (DC) is present
between pin 1 (-) and pin 2 (+).
i If no voltage is present, check the control PCB and
replace if necessary.
2. Check whether an output signal is present between
pin 1 (-) and pin 3 (+).
i The output signal is between 0 V and 10 Volt, i.e.
1.0 Volt corresponds to 1.6 bar. If the pressure
gage shows 3 bar relative (4 bar absolute), the
voltage must be 2.5 Volt.
i When replacing the pressure sensor, a special
thread sealant (e.g. Loctite 542) must be used.
12.3 Pressure switch P2
i The pressure switch is normally closed between
contacts 1 and 2, and open between contacts 1
and 4. The pressure switch opens at 16 bar.
To check the pressure switch, carry out the following
steps:
1. Close V1 - V4.
2. Remove the red hose from the internal refrigerant
cylinder and connect the red service hose to the
internal refrigerant cylinder.
3. Close both valves on the refrigerant cylinder.
4. Remove the blue hose from the internal refrigerant
cylinder and connect a pressure gage using a
T-piece.
5. Open V4.
6. Open V1.
7. Start the recovery function.
8. As soon as the pressure reaches 16 bar, recovery
must be ended, and the message
PRESSURE VALUE TOO HIGH is displayed.
9. Drain the pressure into the internal refrigerant
cylinder by opening the high pressure valve.
i When replacing the pressure switch, a special
weight sealant must be used.
12.4 Expansion valve
i The expansion valve is a pressure control valve
that is set to a value between 2 and 2.3 bar and
maintains a constant pressure before the oil
separator.
! The refrigerant cylinder must contain at least 6 kg
of refrigerant.
1. Connect the low pressure service hose to the
connection after the expansion valve using the
adapter supplied.
2. Close HP and LP valves.
3. Start the recycling function.
" After around 10 minutes, the pressure value must be
between 2 and 2.3 bar.
i Adjust the value by turning the hexagonal screw in
the expansion valve upper part, if the pressure is
not within the indicated range (between 2 and
2,3 bar).
$ Clockwise to increase the value.
$ Counterclockwise to decrease the value.
i In case of replacement, use the right o-rings and
perform the calibration as instruction above.
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