Johnson Controls Sabroe SAB 193 L, Manual, Page: 26 / 171

Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
26/168 008831 en 2020.10
Safety precautions
3.2.7 Lubricating oils
Compressor oils include the following oil types:
Code design Oil types
M
Mineral oil, naphtenic base
A
Synthetic oils based on alkylated aromatics (alkyl-benzene)
AP Synthetic oils blended from alkyl-benzene and poly-alfa-olefin base stocks
S Semi synthetic oils (hydro-treated mineral oil on paraffinic base)
PAO
Synthetic oils based on poly-alfa-olefin
POE Synthetic oils based on polyol esters
PAG Synthetic oils based on polyalkylene glycols
When charging oil, follow the safety instructions given by the oil supplier (MSDS: Material Safety
Data Sheet). Always avoid direct contact with the oil as this may cause skin allergies. Always use
protective equipment, goggles and gloves, when charging oil.
When changing oil on the compressor or draining oil from the vessel of the refrigeration plant, al-
ways collect the used oil in containers marked “waste oil” and send them to an approved incinera-
tion plant. It is not recommended to reuse oil.
3.2.8 Refrigerants
Be very careful when dealing with refrigerants. For safe handling, please refer to the safety/data
sheets delivered by the refrigerant supplier.
Warning!
Be aware that large amounts of leaking (or released) refrigerant entail a risk of asphyxiation. If in
direct contact with leaking liquid refrigerant, there is a high risk of injuries caused by frostbite.
3.2.9 Purging a refrigeration plant
Purging of air or other non-condensable gases is required in order to keep high system perform-
ance and avoid corrosion of the equipment, which could endanger the safety of persons and
equipment.
When purging a refrigeration system, make sure to observe the following:
• Refrigerants must not be released into the atmosphere, except CO
2
, which can be re-
leased slowly into the atmosphere.
• When purging an ammonia system, use an approved air purger. The purged air must pass
through an open container or water for any remaining ammonia (R717) to be absorbed.
The water mixture must be sent to an approved hazardous waste disposal site.
• Halocarbon refrigerants (CFC, HCFC and HFC) cannot be absorbed by water. An approved
air purger must be fitted to the system. This must be checked regularly by use of a leak
detector. All precautionary measures practicable must be taken to prevent and minimise
leakage of refrigerant from refrigeration and air conditioning systems to the atmosphere.
Note: The occurrence of air is usually an indication of poor maintenance or lack of thoroughness
at installation.
Note: Ammonia systems should be purged on a regular basis to avoid atmospheric air and other
non-condensable gases.