Oils for Bitzer scroll compressors

Characterising the oils

Bitzer oils for scroll compressors

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!

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

Application range of oils in Bitzer scroll compressors. For application limits see also Bitzer Software.

Oil

compressor series

suitable e.g. for
refrigerants

Application range

BSE35K

ESH7

R134a
R404A
R407C
R507A

air conditioning, heat pumps, process cooling

BVC32

Orbit series
(GSD / GSU / GED)

R410A
R32
R452B
R454B

air conditioning, heat pumps, process cooling

BSG68K

Orbit series
(GSP)

R290
R1270

air conditioning, heat pumps, process cooling

Technical data

Technical data of the oils for Bitzer scroll compressors

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: Limit temperature depending on oil content (mass % of oil in oil refrigerant blend).M: Range of complete miscibility. P: Phase separation range (miscibility gap).
Miscibility gaps: Limit temperature depending on oil content (mass % of oil in oil refrigerant blend).
M: Range of complete miscibility.
P: Phase separation range (miscibility gap).

Miscibility gaps BSG68K

Miscibility gaps: Limit temperature depending on oil content (mass % of oil in oil refrigerant blend).M: Range of complete miscibility. P: Phase separation range (miscibility gap).
Miscibility gaps: Limit temperature depending on oil content (mass % of oil in oil refrigerant blend).
M: Range of complete miscibility.
P: Phase separation range (miscibility gap).

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.

Refrigerant pressure depending on oil temperature and refrigerant content (mass % of refrigerant in oil-refrigerant blend).
Refrigerant pressure depending on oil temperature and refrigerant content (mass % of refrigerant in oil-refrigerant blend).
Refrigerant pressure depending on oil temperature and refrigerant content (mass % of refrigerant in oil-refrigerant blend).
Refrigerant pressure depending on oil temperature and refrigerant content (mass % of refrigerant in oil-refrigerant blend).

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.

Warning values for used Bitzer oils.
(*): that is ± 15% of the value for new oil

Oil

Kinematic viscosity at 40°C
(DIN EN ISO3104)

Max. water content
(DIN51777-2)

Total acid number
(DIN51558-1)

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!

Fire hazard!

The used oil contains a relatively large amount of dissolved refrigerant.

Pack used oil safely. Dispose of in an environmentally friendly manner.

  1. 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.
  2. Used oil from such systems may still contain relatively high percentages of dissolved flammable gases even at atmospheric pressure. These components gas out.
  3. Observe during storage and transport:
  1. Fill used oil into pressure resistant vessels.
  2. Fill vessels with nitrogen as a protective gas and close them.
  3. 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:

Polyvinyl ether oils (PVE) with HFC and HFO refrigerants (and blends containing them):

Polyalkylene glycol oils (PAG) with R290:

Relevant literature recommends the following seaI materials: