Additional Services; Refrigerant Top Up; Hose Drain; A/C Performance Test - Bosch ACS 251 Original Instructions Manual

9. Turn the HP/LP quick couplers in the counterclock-
wise direction and disconnect from the service con-
nections on the vehicle A/C system.
10. Press .
11. Press  to start draining the refrigerant from the
hoses.
 Once the refrigerant is drained, a summary
screen is displayed.
"
The servicing of the vehicle A/C system is complete.
6.8

Additional services

6.8.1

Refrigerant top up

If there is a decrease in the quantity of refrigerant in
the vehicle A/C system, an additional quantity can be
added.
Before doing a top up, the quantity of refrigerant al-
ready present in the car A/C system is not known. In
such a scenario, topping up might result in overcharging
of the refrigerant. A top up should be performed only
after ascertaining the quantity of refrigerant already
present in the car A/C system. Else, a complete A/C
service should be performed.
1. In the main menu, select "A/C Services" and press
E. Alternatively, press the MENU button on the
keypad.
2. Select "Add. Services" and press E.
3. Select "R134a Top Up" and press E.
4. Connect the LP coupler to the service connection on
the vehicle A/C system and press .
5. Start the vehicle and switch on the A/C. Press .
6. Enter the quantity of refrigerant to be topped up.
Press .
i
The valid top up quantity range is between 20 and
100 grams.
7. Press .
 The refrigerant top up starts. At the end of the
service, Hose Drain menu is displayed.
8. Turn the HP/LP quick couplers in the counterclock-
wise direction and disconnect from the service con-
nections on the vehicle A/C system.
9. Press .
10. Press  to start draining the refrigerant from the
hoses.
 Once the refrigerant is drained, a summary
screen is displayed.
"
You have successfully topped up the refrigerant in the
vehicle.
Bosch Limited
Program description | ACS 251 | 17
6.8.2

Hose drain

After every recharge / top up, some quantity of refriger-
ant is left in the hoses. It is necessary to drain the re-
frigerant from the hoses.
1. In the main menu, select "A/C Services" and press
E. Alternatively, press the MENU button on the
keypad.
2. Select "Add. Services" and press E.
3. Select "Hose Drain" and press E.
 The Hose Drain menu is displayed.
4. Turn the HP/LP quick couplers in the counterclock-
wise direction and disconnect from the service con-
nections on the vehicle A/C system.
5. Press .
6. Press  to start draining the refrigerant from the
hoses.
 Once the refrigerant is drained, a summary screen
is displayed.
"
The servicing of the vehicle A/C system is complete.
6.8.3

A/C performance test

The health of the vehicle A/C system can be monitored
by checking the pressure and temperature at a specific
location as recommended by the vehicle manufacturer.
The A/C performance can be done before or after ve-
hicle A/C service.
1. In the main menu, select "A/C Services" and press
E. Alternatively, press the MENU button on the
keypad.
2. Select "Add. Services >> "A/C Test".
3. Press E.
4. Connect the HP and LP service hoses to the respec-
tive service connections on the vehicle A/C system.
Press .
5. Start the engine with the vehicle gear lever turned to
Neutral.
6. Switch on the vehicle A/C to Maximum (cooling to
maximum). Press .
7. Press .
8. Perform the A/C system test based on either of the
following as per the vehicle manufacturer's recom-
mendation:
$
Grill temperature
$
HP and LP pressure gauge readings
9. After the A/C system test is complete, turn off the
engine and the vehicle A/C system. Press .
10. Disconnect the HP hose from the HP service con-
nection of the vehicle A/C system. Press .
11. Follow the instructions displayed.
12. Press E.
 The A/C TEST HOSE DRAIN menu is displayed.
13. Detach the LP coupling and press .
14. Press  to start the hose drain.
"
Upon completion of the hose drain, the A/C perfor-
mance test is complete.
en
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F 002 DG9 425 2014-03-20