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Piping Machining - Mitsubishi Electric PEH-P8YE Technical & Service Manual

Air-cooled heat pump type packaged air conditioners, indoor unit
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[2] Piping Machining

Use ester oil, ether oil or alkylbenzene (small amount) as the refrigerator oil to coat flares and flange connections.
Reason:
1. The refrigerator oil used for the equipment is highly hygroscopic and may introduce water inside.
Notes:
Introducing a great quantity of mineral oil into the refrigerant circuit may also cause a compressor failure.
Do not use oils other than ester oil, ether oil or alkylbenzene.
Use only the necessary minimum quantity of oil !
–3–

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