Appendix 6 - Trouble Shooting - MAHLE ACX380 Service Manual

APPENDIX 6 – TROUBLE SHOOTING
The responsibility for the effects on people, animals or property resulting from inspection and repair work is entirely attributable to The responsibility for the effects on people, animals or property resulting from inspection and repair work is entirely attri The responsibility for the effects on people, animals or property resulting from inspection and repair work is entirely attri
the technician who works on the equipment. The suggestions given on the following pages are only indicative and the the technician who works on the equipment. The suggestions given on the following pages are only indicative and the technician who works on the equipment. The suggestions given on the following pages are only indicative and
MALFUNCTION
During the recovery phase
there is an evident refrigerant
leak from the exhausted oil
container.
The leak test is negative.
During the automatic cycle it
is not possible to recover the
oil.
Vacuum pump emits
disturbing vibrations
After the vacuum phase the
leak test has a negative result.
Hoses emptying not
completed with system under
pressure
Hoses emptying not
completed.
With pressure at 0 bar (empty
circuit)
First filling procedure not
correctly carried out.
Alarm A 002 Pressure switch
intervention (compressor does
not start)
TROUBLE SHOOTING
Before approach the unit wear the personal protective systems Before approach the unit wear the personal protective
manufacturer declines all responsibility for them. manufacturer declines all responsibility for them.
POSSIBLE CAUSE POSSIBLE CAUSE
Dirt inside the Oil Dirt inside the Oil
discharge solenoid valve. discharge solenoid valve.
Oil loading cell out of Oil loading cell out of
calibration or defective. calibration or defective.
Defective vacuum pump Defective vacuum pump
This may occur when the This may occur when the
vacuum time is too short, vacuum time is too
4-5 minutes.
Gas leakage from internal Gas leakage from internal
cylinder/tank
or compressor or compressor
malfunction
Pressure sensor not Pressure sensor not
calibrated
Mistake during procedure. Mistake during procedure.
High pressure inside the High pressure inside the
recovery group recovery group
Check valve before Check valve before
condenser blocked blocked
Manual valve before before
internal bottle closed closed
POSSIBLE SOLUTION
1. Cleaning of the solenoid valve OUT – S.
2. Check of the gasket efficiency.
3. calibrate pressure sensor
1. Calibration of the exhausted oil scales.
2. Replace if needed.
Vacuum pump replacement
When a vacuum time less than 20 minutes is set, the following message When a vacuum time less than 20 minutes is set, the following message
appears:
"Less than 20 minutes of vacuum do not guarantee the execution of a "Less than 20 minutes of vacuum do not guarantee the execution of a
correct procedure. Continue?".
The solution is keeping to the 20 minutes vacuum time. The solution is keeping to the 20 minutes vacuum time.
check for leaks from valves R.
or check compressor functioning
Altitude compensation
and/or full pressure calibration
Altitude compensation
and/or full pressure calibration
Verify if internal bottle pressure level is over 18 bar, if yes: wait for pressure level is over 18 bar, if yes: wait for
pressure reduction, or uncondensable gases discharge. uction, or uncondensable gases discharge.
If not: use personal safety protections, open equipment and check: If not: use personal safety protections, open equipment and check:
1) Internal bottle "refrigerant pressure" is >= 18 bar inside menu "refrigerant pressure" is >= 18 bar inside menu
"Maintenance" and submenu "unit values view") "Maintenance" and submenu "unit values view") – wait for
pressure reduction or uncondensable
2) Check if inlet valve (red valve knob)
Status closed - open the valve and wait
•
the pressure reduction the pressure reduction
Status open – wait for pressure reduction
•
3) If not fixed with previous actions - it is necessary to
investigate the following items
the pressure safety switch status
•
the check-valve (one-way valve on condenser)
•
4) Measure the pressure between the compressor and Measure the pressure between the compressor and
condenser HP side of recovery group (use a ¼ SAE hose with condenser HP side of recovery group (use a ¼ SAE hose with
connector to open internal valve and a pressure gage) connector to open internal valve and a pressure gage)
5) if pressure is
<18 bar the pressure switch need to be
•
not activated (circuit closed) not activated (circuit closed)
>18 bar the pressure switch need to be >18 bar the pressure switch need to be
•
activated (circuit open) activated (circuit open)
i.e. if pressure is 10 bar and pressure switch is activated (circuit open) i.e. if pressure is 10 bar and pressure switch is activated (circuit open)
change it with a new original pressure switch
| ACX380/480 ACX380/480 | 40
open the valve and wait
wait for pressure reduction
it is necessary to
safety switch status
way valve on condenser)
pressure switch need to be
en