WAKL5N0802A
Edition: 07.02.2022
Page: 11/18
The high pressure switch (8) can alternatively be chec
ked with the diagnostics device “Star
Diagnostics”. This method also requires prior connection of the pressure manometers (HD and
ND) to the refrigerant compressor, in order to read the switch-off and re-switch-on points.
Danger! Attention!
The service shut-off valve on the refrigerant compressor (ND and HD) must not be closed
(turned clockwise until stop) when the refrigerant compressor is running because the very rap-
id pressure increase on the high pressure side (HD) or the rapid pressure drop on the low
pressure side (ND) can damage the refrigerant compressor.
Return the service shut-off valves ND (6) and HD (2) to
their initial position (turn valve counter-clockwise until
stop). Evacuate manometer hoses and detach.
3.7. Check of screw connections on compressor for tightness
Check all fixing screws on the compressor, compressor mounting plate as well as the screws on
the flange valves High Pressure (2) and Low Pressure (6) for tightness.
Screw torque of fixing screws
: 21 Nm
Screw torque of flange valves
(2) and (6): 45 Nm
3.8. Fresh air / recirculation air filter check for contamination, if necessary replace
Danger!
Use an appropriate scaffold for carrying out maintenance works.
Loosen the quick fasteners of the evaporator cover and open it.
Take out the air filters (2 pieces UL500EM und 3 pieces UL700EM per
unit side).
Clean or exchange filters.
When mounting the filters, take care that the arrows on the upper side
of the filter point towards the vehicle’s outside.
Reassemble in reverse order!
1
2
3
4
5
6
7
8
Oil sight glass
Fixing screws
Compressor mounting plate
Quick fasteners
Air filter
