MAHLE ACX150, Service Manual

Page: 29 / 202

EN | 28 | ACX150/250 | Replacement interventions
© MAHLE
Replacement of LP branch pressure
sensor
New and exhausted oil scale replacement
Replacement of accumulation receiver
with safety valve (20 bar)
Replacement of HP vehicle quick coupler
Replacement of LP vehicle quick coupler
Dryer filter replacement
Replacement of refrigerant accumulation
receiver
Refrigerant scale replacement
Replacement of HP branch pressure
gauge
Replacement of LP branch pressure
gauge
Replacement of logic electronic board
with display
Replacement of electronic power board
14.2 Extraordinary
maintenance
14.2.1 Replacement of component
connected to refrigerant
circuit
The equipment contains parts subject to
directive PED Pressure Equipment
Directive 97/23/EC.
The components (pressurised equipment)
constituting/connected to the refrigerant
fluid circuit through permanent junctions,
such as sealing or brazing, can in no way
be disassembled, replaced, changed or
handled.
Before each check and/or replacement
intervention of components inside the
machine it is recommended to firstly carry
out the following operations:
Apply the 2 pipes in the supports on the
side of the machine and close the taps
counter clockwise.
1. Switch off the machine, remove
the power supply cable and
open the cover and the front
panel.
2. Close central tap (liquid side) of
the tank with service kit key
(about 7 clockwise turns)
3. Reconnect the power supply
cable, turn on the machine (do
not touch terminals or printed
circuit boards)
4. Open the service menu
5. Select manual activations
6. In manual activations activate
OUT R, OUT I, OUT A, C, wait
for the LP gauge to show a
pressure of at least - 0.4 bar,
7. Switch off the machine and
remove the power supply
network cable
It is recommended to not disperse the
refrigerant in the atmosphere.
If it is necessary to provide for emptying
of the internal tank, you have to carry out
refrigerant recovery with a second
machine, after having interconnected the
equipment with the HP pipe and having
placed the machine to empty with the
open tank and open OUT R valve.
Alternatively, it is possible to disconnect
the inlet to the tank on the gas side by
connecting the pipe to an external tank to
fill and by activating OUT R, OUT I, OUT
A, C until obtaining a tank pressure of
about -0.4 bar,
14.2.2 Replacement of logic
electronic board with
display
After having excluded any problem
regarding software, power supply, fuses
on the switch block, connection cables,