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EN
EN - 13 NA 06.130 C
22 - SERVICING
22.1 Safety instructions
Perform operating inspections in accordance with national regulations.
Do not climb on the machine; use a platform to work at the necessary height.
Do not climb on the copper refrigerant pipes.
All work on the unit's electrical or refrigerant systems must be performed by a qualified authorised technician.
Any opening or closing of a shut-off valve must be performed with the unit off.
The liquid valve (located just before the dryer) must be opened completely when there is refrigerant in the circuit.
Do not work on any electrical components without first turning off the main disconnect switch in the electrical box. Although the
compressors are turned off, the power circuit remains energised until the unit disconnect switch is opened.
Furthermore, there may still be live elements: this is due to external controllers connected to the orange disconnect terminals on
the main terminal. Unplug the removable portion of these terminals before commencing any work.
The surfaces of the compressor and pipes may reach temperatures of over 100°C and cause burns if touched. Likewise, the
surfaces of the compressor may in some cases drop to freezing temperatures.
It is therefore important to take special care when conducting maintenance work.
Technicians working on the unit must wear the necessary safety gear (e.g. gloves, eye protection, insulating clothing, safety
shoes, etc.).
22.2 Noise
Similarly, we recommend that personnel working close to sources of high noise emission wear sound-proof headphones. These
sound-proof headphones should in no way impede the wearing of other protective equipment.
22.3 Oil
Oils for refrigeration units are virtually harmless provided the following precautions for use are followed:
- Avoid unnecessary handling of components lubricated with oil. Use protective creams.
- Oils are flammable and must be stored and handled with care. Disposable rags or cloths used for cleaning must be kept
away from open flames and disposed of in the appropriate manner.
- Containers must be stored with their caps on. Avoid using oil from an opened container stored under poor conditions.
22.4 Refrigerants - general information
Always remember that refrigeration systems contain pressurised liquids and vapours.
All necessary precautions must be taken when opening the system partially.
A certain amount of refrigerant will be released into the air when the primary refrigeration circuit is partially opened.
It is essential to keep the amount of lost refrigerant as low as possible by pumping the charge and isolating it in another part of
the system.
The refrigerant and lubricating oil, and the low-temperature liquid refrigerant in particular, may cause inflammatory lesions similar
to burns if they come into contact with the skin or eyes.
Always wear protective eyewear, gloves and other protective equipment when opening pipes or tanks liable to contain liquids.
Store unused refrigerant in the appropriate containers and limit the amounts stored in machine rooms.
Cylinders and tanks of refrigerant must be handled with care and signs warning users of the related poisoning, fire and explosion
hazards must be posted in conspicuous locations.
Refrigerant that reaches the end of its life must be collected and recycled in accordance with applicable regulations.
Warning:
Mixing with any type of fluid other than that indicated on the name plate may seriously impact the performance and
service life of your unit.
22.5 Halocarbon and hydrofluorocarbon refrigerants
Although non-toxic, vapours from halocarbon and hydrofluorocarbon refrigerants remain hazardous because they are heavier
than air and can force the latter out of mechanical rooms.
If refrigerant is accidentally released, ventilate the room with fans. Exposure levels in workplaces must be kept to a practical
minimum and must never exceed the recognised limit of 1000 ppm for an 8-hour working day and a 40-hour working week.
Although halocarbon and hydrofluorocarbon refrigerants are not flammable, keep them away from open flames (e.g. cigarettes)
as temperatures of over 300°C cause their vapours to break down and form phosgene, hydrogen fluoride, hydrogen chloride and
other toxic compounds. These compounds may produce severe physiological consequences if accidentally inhaled or swallowed.
Warning : Do not expose R32 vapours and zeotropic blends of refrigerants containing R32 to open flames (such as cigarettes,
etc.). Refrigerants must be evacuated from pipes and tanks before any cutting or welding work is started. Do not use a torch to
check for leaks of refrigerants containing halocarbons such as R32 and its by-products.