WAKL5N0802A
Edition: 07.02.2022
Page: 7/18
3. Maintenance of the refrigerant circuit
3.1. Check of refrigerant level in the sight glass of the roof unit
Start air conditioner.
The air conditioner is operated via the original controller of the vehicle (see original operating
manual)
Check the refrigerant level in the sight glass. To this, the cover must be opened to see the sight
glass.
The refrigerant should be bubble-free through the sight glass!
3.2. Leakage test with an electronic leak detector
If the unit performs insufficient due to lacking refrigerant or after interventions in the refrigerant cir-
cuit and maintenance the unit has to be tested for leaks.
This can be done during operation of the unit resp. at a system pressure of approx. 15 bar nitrogen
with refrigerant portion.
Use only electronic leak detectors! The usage of contrast agents for leak detection is
not permitted and can cause warranty rejection!
3.3. Cleaning of condenser coil
Clean the condenser coil only when the
vehicle engine is stopped and the a/c unit is shut off
!
Danger!
Cleaning of the condenser is only possible from the top of the roof. Safeguard the vehicle so that
no unauthorized person can move the vehicle. Protect against falling down the roof (safety belt,
scaffold, ladder, etc.)
Demount the condenser fans completely (see point
) and blow compressed air through the
opening against the air flow direction.
Sight glass
