Oils for Bitzer scroll compressors
Characterising the oils
Oil | Oil type | Applications | Designation on compressor |
---|---|---|---|
BSE35K | polyolester oil (POE) | oil charge for ESH7 | "Y" (e.g. ESH730BY) |
BVC32 | polyvinyl ether oil (PVE) | oil charge for Orbit | "V" (e.g. GSD60154VAB) |
BSG68K | polyalkylene glycol oil (PAG) | oil charge for Orbit with refrigerant R290 (propane) | "Z" (e.g. GSP60235ZL) |
Risk of compressor damage!
Bitzer scroll compressors may only be operated with the indicated original Bitzer oils!
Low GWP refrigerants: stricter requirements for refrigeration systems
Many refrigerant blends with low global warming potential (GWP) such as R452B and R454B contain the unsaturated compound R1234yf. This is highly soluble in oil and leads to a strong reduction of viscosity. Therefore, sufficient superheat has to be ensured! The low chemical stability (which is desirable for a low GWP) requires particular care regarding cleanliness, dryness and evacuation of the refrigerant circuit.
Material safety data sheets
Apart from this document, please observe the material safety data sheet (MSDS) for the respective oil. It contains information on toxicity, handling, personal protective equipment and disposal of the oil. Material safety data sheets for all Bitzer oils are available on request.
Application range
Oil | compressor series | suitable e.g. for | Application range |
---|---|---|---|
BSE35K | ESH7 | R134a | air conditioning, heat pumps, process cooling |
BVC32 | Orbit series | R410A | air conditioning, heat pumps, process cooling |
BSG68K | Orbit series | R290 | air conditioning, heat pumps, process cooling |
Technical data
BSE35K | BVC32 | BSG68K | Unit | |
---|---|---|---|---|
Density at 15°C | 1.006 | 0.93 | 1.003 | g/ml |
Flashpoint | 247 | 178 | >200 | °C |
Pour point | -57 | -48 | -46 | °C |
Kinematic viscosity | ||||
at 20°C | 74 | 100 | cSt | |
at 40°C | 32 | 32 | 68 | cSt |
at 100°C | 6 | 5 | 16 | cSt |
Specific heat capacity | ||||
at 40°C | 1.94 | 2.01 | kJ/kg*K | |
at 100°C | 2.12 | 2.14 | kJ/kg*K | |
Thermal conductivity | ||||
at 40°C | 0.15 | 0.13 | W/m*K | |
at 100°C | 0.14 | W/m*K |
Miscibility gaps BSE35K and BVC32
Miscibility gaps BSG68K
Refrigerant solubility in oil
The following diagrams can be used to read off the refrigerant content in the lubricant depending on refrigerant pressure and oil temperature.
Warning values for used oils
The listed refrigeration compressor oils are categorized as group KD according to DIN51503, Part 1. To determine the used condition of the BSE35K POE oil, e.g. with respect to water content or total acid number (TAN), the reference values of DIN 51503, Part 2, apply. For the BVC32 PVE oil, the warning values provided by the manufacturer apply.
Oil | Kinematic viscosity at 40°C | Max. water content | Total acid number |
---|---|---|---|
BSE35K | outside of 27 .. 37 cSt (*) | 200 mg H2O/kg oil | 0.2 mg KOH/g |
BVC32 | outside of 27 .. 37 cSt (*) | 500 mg H2O/kg oil | 0.2 mg KOH/g |
BSG68K | outside of 58 .. 78 cSt (*) | 800 mg H2O/kg oil | 0.2 mg KOH/g |
When using A2L or A3 refrigerants:
Fire hazard!
The used oil contains a relatively large amount of dissolved refrigerant.
Pack used oil safely. Dispose of in an environmentally friendly manner.
- Hydrocarbons, for example propane, R290 or propene, R1270 and low-fluorinated flammable refrigerants, for example R1234yf, dissolve very well in refrigeration compressor oil at room temperature. This also applies to blends containing these substances.
- Used oil from such systems may still contain relatively high percentages of dissolved flammable gases even at atmospheric pressure. These components gas out.
- Observe during storage and transport:
- Fill used oil into pressure resistant vessels.
- Fill vessels with nitrogen as a protective gas and close them.
- Mark them, e. g. with the warning sign "flammable substance" W021 from ISO7010.
Elastomer compatibility
Polyolester oils (POE) with HFC and HFO refrigerants (and blends containing them):
Relevant literature recommends the following seaI materials:
- acrylonitrile butadiene rubber, nitrile content >36%
- hydrogenated acrylonitrile butadiene rubber, nitrile content >36%
- ethylene propylene diene rubber
Polyvinyl ether oils (PVE) with HFC and HFO refrigerants (and blends containing them):
- chloroprene rubber
- hydrogenated acrylonitrile butadiene rubber, nitrile content >36%
Polyalkylene glycol oils (PAG) with R290:
Relevant literature recommends the following seaI materials:
- chlorobutadiene rubber, e.g. neoprenes
- acrylonitrile butadiene rubber, nitrile content >36%
- hydrogenated acrylonitrile butadiene rubber, nitrile content >36%
- fluorinated rubber