Factors influencing the inspection and replacement intervals
The lifetimes of the compressor components are determined by several influences. Any serious statement on inspection and replacement intervals of compressor components is only possible with restrictions. The information in this document is based on empirical values.
BITZER recommends logging of the operating data with the compressor module CM-SW-01 for HS.95 und OS.(A)95 or with the optional compressor protection device SE-i1 for HS.53 .. HS.85 and OS.53 .. OS.85. Use the BEST SOFTWARE from the BITZER website to analyse the data.
Influences are:
- Operating conditions
- Operating pressures,
- Suction and discharge gas temperature,
- Oil temperature
- Oil type and operational viscosity
- Refrigerant
- Amount and frequency of liquid floodback out of the evaporator
- Cycling rates
- Time after start until stable conditions are achieved
- Compressor oil level at start
- Risk of hydraulic pressure peaks
- Risk of high switching frequency at low oil pressure after safety cut-outs
- Type and control of oil cooling
- System and oil contamination levels
Normal operation
Further on, the term "normal operation" shall mean that
- the compressor is operated at a safe distance within the operating limits,
- the appropriate suction gas and discharge gas superheat, neither too high nor too low, is ensured.
This prevents dilution of the oil by refrigerant dissolution or excessive thermal load. - the compressor is operated with original BITZER oil.
- other specifications of BITZER are observed.
All given inspection and replacement intervals can only be rough guidelines. Any kind of assurance for a certain lifetime or characteristic feature – as defined by warranty – cannot be obliged to.
Lifetime and replacement intervals of components can only be predicted relatively exact:
- for factory produced systems based on empirical values of the system manufacturer or
- for systems that are equipped with several compressors (parallel operation) and if at the same time one or more compressors of this system or of a parallel system are thoroughly inspected after 10000 running hours.