Hello every one here. I have a question? Is the grade of viscosity important for Bitzer semi hermetic compressor. I used to use 32 as a viscosity grade and now i have to use 68. Is there is a problem

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  • Hello every one here. I have a question? Is the grade of viscosity important for Bitzer semi hermetic compressor. I used to use 32 as a viscosity grade and now i have to use 68. Is there is a problem
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Posted by Abdelaziz Ahmed (Discussions: 1, Comments: 4)
Replied on January 10, 2018 12:00 am
Category: Used Oil Analysis
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The compressor lubricating channels are designed for a specific viscosity grade and normally it is recommended by the manufacturer. Therefore it is advisable to use the same grade. Also the VG 68 is heavier than VG32 and therefore not recommended.
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Posted by Sivasubramaniam Sankaralingam (Discussions: 0, Comments: 2)
Replied on January 9, 2018 7:00 pm
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Why do you have to use VG 68? Sounds like a bad idea.
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Posted by Petr Vavruch (Discussions: 0, Comments: 21)
Replied on January 9, 2018 7:00 pm
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It is the same as if you have a hole for an M5 screw and you want to use M10. You can make it work but it’s by no means an optimal solution.
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Posted by Boris Zhmud, Ph.D., Assoc. Prof., FRSC (Discussions: 0, Comments: 16)
Replied on January 10, 2018 7:00 pm
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Actually the main problem that i have bitzer compressor and client put Mobil 226E to this unit (r404a) and this oil not equal to using it with this type of fireon. Now what can i do.
Sivasubramaniam Sankaralingam . Petr VavruchBoris Zhmud, Ph.D., Assoc. Prof., FRSC?
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Posted by Abdelaziz Ahmed (Discussions: 1, Comments: 4)
Replied on January 10, 2018 7:00 pm
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Mobil Gargoyle Arctic SHC 226 E is not for use with R404! It's mainly for ammonia (R717)! Make an oil change and use an refrigerant oil (POE) intended for R404, ISO VG32. Probably you have to flush the systems several times to get rid of the present oil.
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Posted by Robert Wikman (Discussions: 0, Comments: 2)
Replied on January 10, 2018 7:00 pm
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Mobil fluid for R404a should be EAL Arctic 32.
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Posted by Alessandro Paccagnini, CLS / MLT-I (Discussions: 2, Comments: 11)
Replied on January 11, 2018 7:00 pm
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It depends on the recommendation of the manufacturer. Do you have any problem with VG32? VG 68 is too viscous and can lead to much energy wastage and high temperature if it is Vg 32 that is good. Obviously, you have to check if both are compatible.
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Posted by Joseph FOTUE, CLS (Discussions: 0, Comments: 2)
Replied on January 11, 2018 7:00 pm
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Verifica la recomendación del fabricante o catálogo del equipo .allí encontrarás información adecuada y real para que definas que lubricante necesitas y si tiene garantía es importante mantener la
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Posted by luis coronado (Discussions: 0, Comments: 4)
Replied on January 11, 2018 7:00 pm
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Quando um fabricante recomenda um tipo de lubrificante é porque já foram feito testes e com isto escolhido o melhor, o que real mete vai lubrificar o equipamento. Por isto não devemos fazer alterações neste item.
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Posted by Sergio Campagnucci (Discussions: 0, Comments: 1)
Replied on January 12, 2018 7:00 pm
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46 max and this depends on the operating temperature, pay attention to the functional visocity of the machine
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Posted by JC BLANCHET (Discussions: 0, Comments: 2)
Replied on January 12, 2018 7:00 pm
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An ISO VG 68 lubricant is heavier than 32 grade. The effects are more energy consumption, difficult start in winter,...
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Posted by Abdennacer ZIOUCHI (Discussions: 0, Comments: 1)
Replied on January 13, 2018 7:00 pm
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The use of a iso 68 is common where the compressor is sited in high ambient air temp as JC suggests, this link may help you with lue type v refrigerant https://www.bitzer.de/shared_media/documentation/kt-651-2.pdf .but if you can send me the model number I can confirm the spec . As suggeted it is alway best to fully drain and thoroughly flush . if you message me the model number I should be able provide the lubricant option for approved products, for you model
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Posted by Steve Warren (Discussions: 0, Comments: 11)
Replied on January 13, 2018 7:00 pm
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Agree with Steve's comments and others. Who is suggesting you use ISO 68 viscosity grade. Is this an availability issue or a technical edict from the OEM. ?
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Posted by Peter Tedder MBA F.I.MarEST (Discussions: 0, Comments: 4)
Replied on January 14, 2018 7:00 pm
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First of all, check for your equipment manual for OEM recommendation oil to be used, it is often the most accurate and safest way to do so.

In case you do not have OEM recommendation, and you have had good experience in using ISO 32 grade oil, it is recommended to stay with the VG grade unless something is not performing well. ISO 68 could well be too viscous for your equipment especially when it is a refrigeration compressor.

Lastly, especially for refrigeration compressor, as expert above already mentioned, you are using a wrong grade of oil that might not be compatible with your refrigerant, you may want to act swiftly before challenges escalate.
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Posted by Chun Hong Khek (Discussions: 0, Comments: 17)
Replied on January 14, 2018 7:00 pm
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For this freon use an ISO 32 - POE oil = Mobil EAL arctic 32 (iso 32) after appropriate flushing
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Posted by Biagio Schirmo (Discussions: 0, Comments: 1)
Replied on January 14, 2018 7:00 pm
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Hello Abdelaziz, in any compressor, the correct viscosity is vital. Too low viscosity will cause wear due to lack of hydrodynamic mattress. In other words, the oil will drain and will not create a film or mattress between pieces; or the opposite, if the viscosity is too high, the energy consumption will be higher, it will cause wear as the oil does not flow easily through the cavities. It is for this reason that the specifications set by the manufacturer Bitzer for its different types of semihermetic compressors (Reciprocant or screw) must always be respected at all times.

It is also important the base of the lubricant that in the case of Bitzer compressors should be preferably a polyolester.

Lubrizol has approved Emkarate 32 or Emkarate 68 for Bitzer compressors.

Successes
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Posted by Luis Enrique Gómez Serrano (Discussions: 0, Comments: 2)
Replied on January 14, 2018 7:00 pm
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Of course, yes. In all situations, please use only the approved oil OR oil with approved specification & viscosity.
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Posted by Vishnu Sarma (Discussions: 1, Comments: 1)
Replied on January 16, 2018 7:00 pm
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