MAHLE ACX1281, Operation Manual

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22 | ACX1281 | Operation en
6.6 Automatic/manual vehicle A/C
service overview
Phases
Aut
omatic mode
Manual
mode
Recover
y
V
acuum
Rechar
ge
Checking of air conditioner pressure x x x x
Extraction of refrigerant x x – –
Separation of oil from refrigerant x x – –
Formation of vacuum x x x –
Maintenance of vacuum x x x –
Addition of refrigerant
(test quantity 75g)
x – – x
Extraction of refrigerant
(test quantity 75g)
x – – x
Implementation of leak test x – – x
Pressure increase test x x – –
Drainage of oil into used oil bottle
x x – –
Recharging refrigerant x – – x
Tab. 1: Automatic/manual mode overview
x = is implemented
6.6.1 Recovery
t
The pressure in the vehicle air conditioning system is checked
prior to the recovery phase. If the air conditioning system is
depressurized (empty), operator can move to vacuum phase.
6.6.2 Vacuum
t
A vacuum is generated and maintained for at least 5 minutes.
t
Make sure recovery has been performed before generating
the vacuum.
6.6.3 Charging with refrigerant
t
Service phases:
75g test fill, leak test, extraction of 75g
test fill, pressure increase test, vacuum generation and final
charging.
t
If pressure is detected in the vehicle air conditioning system
during charging, recovery must be performed in order to
continue.
6.7 Flushing
6.7.1 Flushing after changing type of oil
m
When servicing a vehicle, the type of oil in the vehicle's A/C
system should be noted to prevent a cross-contamination
inside the ACX1281. If a PAG system is serviced and another
vehicle with a POE system is to be serviced next, a flush
routine must be performed to prevent a cross-contamination
of the oils.
m
If the ACX1281 is not flushed, the internal hydraulic system
and the vehicle air conditioning system could be damaged as
a result of cross-contamination. MAHLE cannot accept liability
for any such damage.
t
Enter the parameters for vacuum time and refrigerant quan-
tity.
1. Select " Vehicle A/C Service >> A/C system flushing >>
Short flushing ".
2. Follow the menu prompting.
t
The Short Flushing procedure is used to clear out the ACX1281
hoses when changing oil types. The Extended Flushing pro-
cedure is used to perform liquid refrigerant flushing on A/C
system components.
6.7.2 Flushing system components
m
Component to be flushed should be empty (no gas or other
substance inside).
m
For maximum flush efficiency, connection shoul dbe made so
that the refrigerant flow is opposite the normal direction of flow.
1. Power on ACX unit.
2. From main menu, select VEHICLE A/C SERVICE>>
A/C SYSTEM FLUSHING>>EXTENDED FLUSHING.
3. After connections are completed as described in section 5.1
of the Flush kit manual, and the flushing process has started,
the process is fully automatic and just needs to be monitored
by technician.
4. The flushing software includes multiple cycles that uses up to
3kg (max) of refrigerant. Each cycle includes a vacuum leak
test, a leak test under pressure using refrigerant and mulitple
flushing cycles of injecting and recovering liquid refrigerant.
A final vacuum is performed to dry the system prior to dis-
connecting.
t
Cycle times can vary in relation to the characteristics of the
component or part of the A/C system being flushed.