CC335/CC355
4. Preventative Maintenance Activities
4.1 General
An air-conditioning system just as all other parts of the vehicle subjected to constant mechanical strain and stress. To ensure
trouble-free operation of the system and to avoid any damage to its parts, it is important that all required service activities on the air
conditioning system are performed by trained and qualified personnel who are knowledgeable in the field of refrigeration.
The proper handling of the system including proof of the service activities record is a prerequisite for acceptance of any warranty
claims in the event of damage to parts subject to maintenance.
Warranty replacement parts and out of warranty replacement parts must be supplied by Spheros Climate System, LLC to assure
the quality and reliability of the product.
Regardless of the maintenance intervals specified in the maintenance and service schedule, all attachments of the unit and the
connections of the refrigerant lines must be checked for tightness within the first four weeks following the initial start-up of the air-
conditioning system or the vehicle.
Even if the air-conditioning system is not in operation, wear caused by normal aging or the strain and stress occurring during the
driving operation of the bus may occur on individual components. All checks listed in the maintenance and service schedule need to
be independent of the operation hours of the system.
Loss of refrigerant is possible even if the refrigerant connections are tight due to the structure of the material of the refrigerant lines
and the ambient temperatures. In the event of a relatively high refrigerant loss within short intervals, leaks in the system can be
assumed.
During long periods of non-use, the air-conditioning system should be operated for about 15 minutes at least twice a month in order
to prevent the shaft seals of the compressor from hardening.
The drive pulley of the electromagnetic clutch is continuously rotating when the vehicle engine is in operation. Bearing wear or
possible damage to the clutch may occur and should be inspected independently of maintenance intervals based on the operating
time of the air-conditioning system. It is imperative that the clutch be checked for correct lubrication, belt tension etc.
CAUTION
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The refrigerant receiver is subject to the Pressure Equipment Directive. Check the receiver every 6 months for cracks,
mechanical damage or corrosion. The receiver must be replaced if any defects are found.
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The maintenance intervals indicated in the maintenance and service schedule are based on the operation hours of the vehicle,
with the exception of the compressor assembly, which are based on the air-
conditioning unit’s hours of operation.
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These time intervals are empirical values that may vary widely depending on the type of system and type of bus concerned
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