What type of refrigeration oil should I use for my screw compressor?

Screw compressors typically require POE (Polyol Ester) oils for HFC refrigerants like R134a and R407C, or mineral oils for HCFC systems like R22. The viscosity grade (usually ISO VG 32-68) depends on the compressor manufacturer's specifications. Brands like Bitzer recommend BSE series POE oils, while FUSHENG systems often use mineral oil formulations.

What is the difference between POE and mineral refrigeration oil?

POE (Polyol Ester) oils are synthetic lubricants designed for HFC refrigerants (R134a, R404A, R407C, R410A) and are hygroscopic, requiring careful moisture control. Mineral oils (MO) are petroleum-based, used with CFC and HCFC refrigerants (R22, R502), and are less expensive but incompatible with modern HFC systems. POE oils offer better thermal stability and miscibility with newer refrigerants.

How do I select the right refrigeration oil for a centrifugal chiller?

For centrifugal chillers, select oil based on the OEM specification (e.g., Trane OIL00037, York PureOil S), the refrigerant type (R123 low-pressure or R134a medium-pressure), and the required viscosity grade. Most modern centrifugal chillers use POE oils with ISO VG 32-68. Always verify compatibility with the chiller manufacturer's technical bulletin and ensure the oil meets the required pour point for your operating conditions.

BITZER Refrigeration Oil B320SH

Description

Company Interduction:

Qishanr is the world’s leading supplier of synthetic lubricants to the refrigeration and air conditioning industry. We combine technically superior products and services from our industry-leading divisions and brandsand make every effort to create the best compressors for refrigeration and air-conditioning as well as more efficientmaintenance machines in the HAVC field.Our products have been spreadly exported to 100 countries and regions, such as EU, North America,Latin America, OceaniaMiddle East, South East Asia, Africa, etc. and got a good reputation among new and regular clients.

Specification:

B320SH	Viskosity mm2/s (cSt）	Density kg/m3	Specific heat kJ/kgk	Heat conductivity W/mk
40℃	300	999	1.68	0.1247
50℃	180	991	1.71	0.1243
60℃	120	983	1.74	0.1239
70℃	80	975	1.77	0.1236
80℃	60	965	1.80	0.1234
90℃	42	957	1.82	0.1231
100℃	32	949	1.85	0.1227
110℃	25	940	1.87	0.1200