Webasto Thermosysteme Roof-top air-conditioning system CC4E
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6.4. Maintenance and service checklist
Abbreviations: m – monthly, a – yearly (a – every six months if operated throughout the year)
6.5. Inspections before repair
In order to avoid unnecessary disassembly or duplication of work, the overall condition of the air-
conditioning system must be checked before starting any repairs.
Visual inspection
a) Outer condition of roof-top unit:
– Hood without cracks and no damage to paint finish
– Air inlets and outlets clean and undamaged
– Attachment points secure and without corrosion
– Hose and wiring connections serviceable
– Openings in metal undamaged.
b) Condition of air distribution panel
– Attachment points / screws secure
– Ventilation switches serviceable
– Circulating air inlet / outlet screen undamaged and clean.
c) Condition of compressor
– Hose connections undamaged and secure
– Attachment parts / screws secure.
Poly-V-belt correctly tensioned
Poly-V-belt and V-belt pulleys undamaged
Electrical connection undamaged
System component Maintenance task Frequency
m 6m a
Refrigerant circuit
– Hoses
– Connections
– Refrigerant quantity
– Condenser
– Receiver-drier
– Condensation water
drain
– Roof-top air-
conditioner unit
Check for chafing and general condition
Test for leaks with leak tester
Check refrigerant level in viewglass
Check condition of fins (must be cleaned if soiled)
Replace
Check that opening is clear and clean if necessary
Check overall condition and secure attachment of
connections
X
X
X
X
X
X
X
Compressor
– Magnetic clutch
– Compressor
– Poly-V-belt
– Mounting bracket
Check engagement without slip / compressor start-up
Check noiseless operation
Check serviceability and tension
Check condition and secure attachment
X
X
X
X
Electrical connections
– Wiring
– Connections
– Motor connections
Check undamaged condition
Check undamaged condition and secure attachment
Check for signs of oxidation
X
X
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