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2012 Mar.2 Mayekawa Mfg. Co., Ltd. Compressor Manufacturing Dept.
Design modification notification No.C0953-00
Notification : The change of the standard materials of O-rings for J series
The standard materials of O-rings have been changed from NBR to HNBR from the serial number
below.
This modification enables J series to be used under conditions below.
Use of carbon dioxide as a refrigerant
Use of PAO base oil
Currently used NBR O-rings should be replaced with HNBR on the next upcoming overhaul.
Applicable model ： J series (170J, 220J, 280J)
Design modification No.： 664-038、674-016、684-012
Applicable serial No.： 170JS： 1750017～
170JM： 1731037～
170JL： 1711075～
220JS： 2250007～
220JM： 2230005～
220JL： 2210008～
280JS： 2850004～
280JM： 2830005～
280JL： 2810004～
<Reference> Usage standard according to O-ring material
O-ring materials Applicable refrigerant Remarks
HNBR Ammonia, HFCs, Carbon dioxide Standard
FKM (Viton) Hydrocarbon system (under development)
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