2.5 RECOMMENDED LUBRICATING OILS
Howden compressors are fitted, as standard, with neoprene ‘O’ rings.
These ‘O’ rings are compatible with the majority of standard refrigerants and many oils, but
compatibility with all possible combinations of refrigerant and oil cannot be guaranteed.
Should you wish to review this matter, please do not hesitate to contact Howden Compressors
Limited, who will be pleased to provide recommendations and costs for any special ‘O’ ring materials
which may be required.
Typical Standard Refrigerants:
R717, R22, R134a, R404A R407C, R410A, R507
Typical Oils:
Mineral Oil
Polyol Ester Oil
Poly Alkylene Glycol Oil
Alkyl Benzene Oil
Oil Viscosity:
For the majority of ammonia refrigeration applications, oil viscosity of 68 centistokes at 40ºC is the
appropriate selection. However, with many other refrigerants, eg; R134a with high condensing
temperatures, or applications involving hydrocarbon gases, a specific oil selection is required.
Howden Compressors Limited offer a consultancy service to all users of HCL product.
Please consult the applications department of HCL who will be happy to advise on grade of oil
applicable to the refrigerant or gas at the specific duty application.
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