4 Installation instructions CC8 roof-top air-conditioning system
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4.15.4 Final filling
CAUTION
If liquid refrigerant is topped up on the intake side (bottle upside down), the compressor
will be destroyed by the hammering action of the liquid.
NOTE
The air-conditioning system can only be filled completely when the compressor is
running. To prevent the compressor being damaged, the refrigerant may only be filled
in gaseous form through the intake side of the system. The bottle must always be kept
in a vertical position with the valve at the top.
The higher the compressor speed, the shorter the time required for filling.
1. Fit cover on the roof-top air-conditioning unit.
2. Open the valve at the intake pressure gauge on the LOW test equipment. The high pressure valve remains closed.
3. Open the bottle valve and the REF filling valve.
4. Reconnect the vehicle battery and start the engine.
5. Set the air-conditioning system to cooling mode (fan speed 3) (see 5.3).
6. Check the weight of the refrigerant bottle and check the inspection window.
NOTE
The correct volume of refrigerant has been inserted into the system as soon as the
refrigerant flows through the inspection with no bubbles with the engine at its high idling
speed.
7. Close all valves on the test equipment. Switch off the air-conditioning system. Close the bottle valve, unscrew the
compressor shut-off valves completely.
8. Switch off the engine.
4.16 Completion
1. Check the refrigerant pressures and the function of the pressure cut-out switches as described in 6.8.
2. Close all open covers on the vehicle/cab.
3. Have a qualified expert check that the installation work has been carried out properly.
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