6.3. Troubleshooting – General
Like all parts of the vehicle, the air conditioning system is subject to constant stresses. It must therefore be serviced regularly by
specialists with experience of refrigeration systems in order to ensure troublefree operation and to prevent damage to the
system parts.
Correct treatment of the system and proof that all the specified service work has been carried out (completed maintenance and
service schedule) are essential for acceptance of warranty claims concerning damage to parts subject to maintenance.
Regardless of the intervals specified in the maintenance and service schedule, all equipment connections and the refrigerant
lines must be checked during the first four weeks after commissioning the air-conditioning system and/or vehicle to ensure that
they are secure.
Even if the air-conditioning system is not used, individual components may suffer wear due to normal ageing or stress resulting
from operation of the bus. The inspections specified in the maintenance and service schedule must therefore be carried out
regardless of the time during which the system is actually operated.
Refrigerant loss may occur even if there are no leaks in the lines. Due to the structure of the material used for the refrigerant
hoses, their diffusion rate can vary depending on ambient temperature. However, a leak must be assumed to exist somewhere
in the system if relatively large quantities of refrigerant are lost at short intervals. To prevent not only the shaft seals of the
refrigerant compressor drying out, but also moving parts in the refrigerant circuit from seizing up due to resinification of the oil,
the air-conditioning system must be switched on for approx. 15 minutes at least once per month when it is not in regular use.
The outside temperature must be over at least 5 °C or the bus must be in a heated garage during this trial run.
The belt pulley of the electromagnetic clutch rotates constantly when the engine is running. Bearing wear and the possibility of
damage to the clutch are therefore more or less independent of the time during which the air-conditioning system is operated. It
is therefore essential to check the clutch for dry running of the bearings etc. as instructed.
IMPORTANT:
• The refrigerant receiver is subject to the requirements of the German regulation on pressure vessels and must be examined
for cracks, corrosion and other signs of damage every six months.
• The receiver must be replaced if cracks, mechanical damage or corrosion are observed.
• The intervals specified in the maintenance and service schedule refer to the vehicle's hours of operation, except in the case of
the compressor, where they refer to the hours of operation of the air-conditioning system.
• The specified intervals are empirical values and can vary considerably depending on the type of system and type of bus.
• The maintenance intervals always refer to the first event occurring.
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