A/C System service | ACX2281 | 18
en
8 A/C service preparation
8.1
Preliminary preparation
Warning - risk of burns from hot engine
components
Contact with hot engine components
will cause severe burns.
Allow the engine to cool down.
Wear protective goggles.
Wear protective gloves.
Warning - risk of frostbite from
escaping refrigerant
Refrigerant causes frostbite on the
skin.
Check the service hoses for damage.
Firmly connect the service quick-
release couplings to the service
hoses.
Wear protective goggles.
Wear protective gloves.
Perform the following preparatory work prior to vehicle
A/C service: Service hoses must be constructed of the
proper materials and have the lengths as supplied by
the unit. Hoses must have shut-off devices (quick-
release couplers) at the connection point to the A/C to
minimize the introduction of air into the ACX2281 and to
minimize the amount of refrigerant released while
disconnecting the hoses.
Inspect hoses for signs of damage prior to performing
A/C service. Use of damaged hoses will result in the
loss of refrigerant and the possibility of refrigerant
contamination.
Follow the vehicle manufacturer's recommendations for
A/C service on vehicles with a low-pressure connection
only.
A/C service operations (especially recovery) should be
performed after the vehicle has been run for a period of
time to allow engine heat to raise system pressure. This
allows for the maximum refrigerant recovery amount to
occur. If system is excessively hot, the recharge phase
could be adversely effected
.
The ACX2281 is only to be operated with R1234yf
refrigerant. Check with refrigerant is used for the vehicle
before performing A/C service.
Never attempt to close the valves of the internal
refrigerant bottle while the ACX2281 is in operation.
Only new lubricant as specified by the system
manufacturer shall be installed in vehicle A/C system.
Lubricant removed from the system and or equipment
shall be disposed of in accordance with the applicable
federal, state and local procedure and regulations.
The service parameters (recharge quantity) can be
found in the owner's manual or the vehicle repair
manual.
8.2 Non-condensable gas discharge
If the ACX2281 detects non-condensable gases in the
internal cylinder, the unit will prompt technician to allow
unit to run an air purge. This prompt will occur every
time unit is powered on (if unit has been powered off for
at least 1 hour.)
The process will perform automatically upon the start of
a charge procedure if non-condensables are detected.
Air purge is a necessary process to ensure ideal working
parameters for the ACX2281. Presence of non-condensable
gases will increase tank pressure and reduce efficiency of
recharge cycles.
8.3 Charge Modes
The ACX2281 has 2 different refrigerant charge
methods. If charge does not complete using Quick
mode, the zero tolerance method automatically
commences
8.3.1
Quick Modes
In Quick mode, the ACX2281 injects refrigerant through HP port.
The refrigerant remains in the hoses at the end of the cycle and is
then recovered during a hose clearing process.
8.3.2
Zero tolerance mode
While the Zero tolerance mode is slightly longer in time, it provides
a more accurate recharge and guarantees a successful charge.
In Zero tolerance mode, the ACX2281 will by default charge
through the HP (red) hose, then refrigerant that remains in the
hoses is pulled into the vehicle's A/C system through the LP (blue)
hose.
In the instance where only a LP coupling is available for A/C
service, the ACX2281 will charge the system with 50% of the
total charge amount with the vehicle A/C compressor off. The
unit then waits 10 minutes to allow the liquid refrigerant to
evaporate to prevent damage to the compressor. The vehicle
must be started and the A/C system turned on. The
ACX2281 will continue to charge the refrigerant whenever
the LP hose pressure is less than 3 bar.
