Additional Services; Refrigerant Top Up; Hose Drain; A/C Performance Test - Bosch ACS 255 Original Instructions Manual

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 "Vehicle A/C Service" >>
"Additional Services". Alternatively, press c and
select "Additional Services".
2. Select "Refrigerant Top Up" and press E.
3. Connect the LP coupler to the LP service connection
on the vehicle A/C system and press .
4. Start the vehicle and switch on the A/C. Press .
5. Enter the quantity of refrigerant to be topped up.
Press .
i
The valid top up quantity range is between 20 and
100 grams.
6. Press .
 The refrigerant top up starts. At the end of the
service, Hose Drain menu is displayed.
7. Turn the HP/LP quick couplers in the counterclock-
wise direction and disconnect from the service con-
nections on the vehicle A/C system.
8. Press .
9. 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.
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 " Vehicle A/C Service" >>
"Additional Services". Alternatively, press c and
select "Additional Services".
2. Select "Hose Drain" and press E.
 The Hose Drain menu is displayed.
Bosch Limited
Program description | ACS 255 | 17
3. Turn the HP/LP quick couplers in the counterclock-
wise direction and disconnect from the service con-
nections on the vehicle A/C system.
4. Press .
5. Press  to start draining the refrigerant from the
hoses.
 Once the refrigerant is drained, a summary screen
is displayed.
"
The hose drain is complete.
6.8.3

A/C performance test

The condition of the vehicle A/C system can be moni-
tored by checking the pressure and temperature at a
specific location as recommended by the vehicle manu-
facturer. The A/C performance can be done before or
after vehicle A/C service.
1. In the main menu, select " Vehicle A/C Service" >>
"Additional Services". Alternatively, press c and
select "Additional Services".
2. Select "A/C Performance Test".
3. Connect the HP and LP service hoses to the respec-
tive service connections on the vehicle A/C system.
Press .
4. Start the engine with the vehicle gear lever turned to
Neutral.
5. Switch on the vehicle A/C to Maximum (cooling to
maximum). Press .
6. Press .
7. 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
8. After the A/C system test is complete, turn off the
engine and the vehicle A/C system.
9. Disconnect the HP and LP hoses from the service
connections of the vehicle A/C system. Press .
10. Press  to start the hose drain.
"
Upon completion of the hose drain, the A/C perfor-
mance test is complete.
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F 002 DG9 432 2014-12-19