Oils for refrigerant R717
Bitzer reciprocating compressors for R717 are supplied filled with Reniso KC68 mineral oil or optionally with SHC226E poly-alpha-olefin oi las standard.
BITZER OS. and HS. compressors for R717 are supplied as standard without oil.
The following oils are available separately:
- Reniso UltraCool 68 (Poly-alpha-olefin oil (PAO) with seal conditioner (SC))
- SHC226E (poly-alpha-olefin oil (PAO))
- Reniso KC68 (mineral oil (MO))
Positive experiences have been made with the following oils, among others:
- Reniso KM32
- Reniso KS46
- Reflo 68A
Reniso UltraCool 68 shows very good overall properties (a very good cold flow behaviour, good compatibility with common sealing materials, low evaporation losses) and is therefore recommended as a standard oil for applications with R717.
Technical data
Reniso KM32 | Reniso KS46 | Reniso KC68 | Reflo 68A | Reniso | SHC226E | Unit | ||
|---|---|---|---|---|---|---|---|---|
MO | MO | PAO / SC | PAO | |||||
Density at 15°C | 0.881 | 0.894 | 0.894 | 0.866 | 0,854 | 0.830 | g/ml | |
Flashpoint | 202 | 204 | 223 | 236 | 250 | 250 | °C | |
Pour point | -45 | -42 | -39 | -42 | -48 | -45 | °C | |
Kinematic viscosity | ||||||||
at 40°C | 32 | 46 | 68 | 58 | 62 | 67 | cSt | |
at 100°C | 4.9 | 5.8 | 7.2 | 7.9 | 9.1 | 10.1 | cSt | |
Specific heat capacity | ||||||||
at 40°C | 1.95 | 1.94 | 1.93 | 1.96 | 2,07 | 2.16 | kJ/kg*K | |
at 100°C | 2.17 | 2.16 | 2.17 | 2.17 | 2,28 | 2.38 | kJ/kg*K | |
Thermal conductivity | ||||||||
at 40°C | 0.13 | 0.13 | 0.12 | 0.13 | 0,14 | 0.14 | W/m*K | |
at 100°C | 0.13 | 0.13 | 0.12 | 0.13 | 0,14 | 0.14 | W/m*K | |
Food safety | ||||||||
NSF- | H2 ② | H2 ② | H2 ② | H1 ① | ||||
① NSF H1 certification: Lubricant suitable for the food industry. Approved for "incidental food contact".
② NSF H2 certification: General lubricant in the food industry. The use of which excludes direct contact with food.
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.
Warning values for used oils
The listed oils are categorized as group KAA according to DIN51503, Part 1. To determine the used condition of the oil, e.g. with respect to water content or kinematic viscosity, the reference values of DIN 51503, Part 2, apply. The visual assessment (oil sample from the low pressure side) is also decisive: clear oil in the colour of fresh oil and without solid components is generally still usable. If the oil is noticeably darker than fresh oil, the water content in particular should be checked.
Oil | Kinematic viscosity at 40°C (DIN EN ISO3104) | Max. water content (DIN51777-2) |
|---|---|---|
Reniso KM32 | outside of 27 .. 37 cSt (*) | 100 mg H2O/kg oil |
Reniso KS46 | outside of 39 .. 53 cSt (*) | 100 mg H2O/kg oil |
Reniso KC68 | outside of 58 .. 78 cSt (*) | 100 mg H2O/kg oil |
Reflo 68A | outside of 49 .. 67 cSt (*) | 100 mg H2O/kg oil |
Reniso UltraCool 68 | outside of 53 .. 71 cSt (*) | 100 mg H2O/kg oil |
SHC226E | outside of 57 .. 77 cSt (*) | 100 mg H2O/kg oil |
Elastomer compatibility
Mineral oils or poly-alpha-olefin oil with seal conditioner with refrigerant R717:
Recommended seaI materials:
- chlorobutadiene rubber, e.g. neoprenes
- hydrogenated acrylonitrile butadiene rubber, nitrile content >36%
Poly-alpha-olefins with refrigerant R717:
Relevant literature recommends the following seaI material:
- hydrogenated acrylonitrile butadiene rubber, nitrile content >36%