SAE J2211-1998 Recommended Service Procedure for the Containment of HFC-134a (R-134a).pdf
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1、SAE Technical Standards Board Rules provide that: “This report is published by SAE to advance the state of technical and engineering sciences. The use of this report is entirely voluntary, and its applicability and suitability for any particular use, including any patent infringement arising therefr
2、om, is the sole responsibility of the user.” SAE reviews each technical report at least every five years at which time it may be reaffirmed, revised, or cancelled. SAE invites your written comments and suggestions. QUESTIONS REGARDING THIS DOCUMENT: (724) 772-8512 FAX: (724) 776-0243 TO PLACE A DOCU
3、MENT ORDER; (724) 776-4970 FAX: (724) 776-0790 SAE WEB ADDRESS http:/www.sae.org Copyright 1998 Society of Automotive Engineers, Inc. All rights reserved.Printed in U.S.A. SURFACE VEHICLE 400 Commonwealth Drive, Warrendale, PA 15096-0001 RECOMMENDED PRACTICE Submitted for recognition as an American
4、National Standard J2211 REV. NOV1998 Issued1991-12 Revised1998-11 Superseding J2211 DEC91 Recommended Service Procedure for the Containment of HFC-134a (R-134a) 1.Scope Refrigerant containment is an important part of servicing mobile air-conditioning (A/C) systems. This procedure provides guidelines
5、 for technicians for servicing mobile A/C systems and operating refrigerant recycling equipment designed for HFC-134a (R-134a) (described in SAE J2210). 2.ReferencesHFC-134a (R-134a) 2.1Applicable Publications The following publications form a part of the specification to the extent specified herein
6、. Unless otherwise indicated, the latest revision of SAE publications shall apply. 2.1.1SAE PUBLICATIONS Available from SAE, 400 Commonwealth Drive, Warrendale, PA 15096-0001. SAE J639 Safety and Containment of Refrigerant for Mechanical Vapor Compression Systems Used for Mobile Air-Conditioning Sys
7、tems SAE J1732 HFC-134a (R-134a) Refrigerant Recovery Equipment for Mobile Automotive Air- Conditioning Systems SAE J1771 Criteria for Refrigerant Identification Equipment for Use with Mobile Air-Conditioning Systems SAE J2099 Standard of Purity for Recycled HFC-134a (R-134a) for use in Mobile Air-C
8、onditioning Systems SAE J2196 Service Hoses for Mobile Air-Conditioning Systems SAE J2197 Service Hose Fittings for Automotive Air Conditioning SAE J2210 Refrigerant Recycling Equipment for HFC-134a (R-134a) Mobile Air-Conditioning Systems 3.Definitions 3.1Recovery/Recycling Unit Refers to a single
9、piece of equipment that performs both functions of recovery and recycling of refrigerants per SAE J2210. 3.2Recovery Refers to that portion of the recover unit operation that removes the refrigerant from the mobile A/C system and places it in the recover unit storage container per SAE J1732. 3.3Recy
10、cling Refers to that portion of the recycling unit operation that processes the refrigerant for reuse on the same job site to the purity specifications of SAE J2099. SAE J2211 Revised NOV1998 -2- 4.Service Procedure 4.1It is important that before attempting to remove refrigerant from the mobile A/C
11、system that a determination be made to identify the refrigerant in the system. Since the A/C system may contain another refrigerant, a combination of refrigerants or excess noncondensables (NCG) to prevent contamination of the refrigerant in the recovery/recycle equipment shall be identified. Use of
12、 refrigerant identification equipment certified to SAE J1771 should be used to determine what refrigerant is in the mobile A/C system about to be recovered. 4.2Connect the recovery/recycling or recovery unit services hoses, which shall have shutoff devices (e.g., valves, quick couples) within 50 cm
13、of the services ends, to the vehicle A/C service port per SAE J639. Hoses shall conform to SAE J2196 and fittings shall conform to SAE J2197. 4.3Operate the recovery/recycling or recovery equipment as recommended by the equipment manufacturers procedure. 4.3.1Verify that the vehicle A/C system has r
14、efrigerant pressure. Should the recovery equipment indicate that the A/C system does not have pressure, do not attempt to process the discharged system as this will introduce air (noncondensable gas) into the recovery/recycling equipment which must later be removed. 4.3.2Begin the recycling process
15、by removing the refrigerant from the vehicle A/C system. Continue the process until the system pressure has been reduced to a minimum of 102 mm of Mercury below atmospheric pressure (vacuum). If A/C components show evidence of icing, the component can be gently heated to facilitate refrigerant remov
16、al. With the recycling unit shut off for at least 5 min, unless the equipment has a device that assures there is no remaining refrigerant, check A/C system pressure. If this pressure has risen above vacuum (0 kPa), additional recovery operation is required to remove the remaining refrigerant. Repeat
17、 the operation until the system pressure remains stable at vacuum for 2 min. 4.3.3Caution shall be taken to assure that the seal on all service hose connections be in good condition. Cut seals and leaking service hoses will cause the recovery equipment to draw air into the unit. These leaks, as well
18、 as, a leak in the mobile A/C system being serviced may result in the automatic shut off device in the recovery unit not to function properly. By allowing the recovery equipment to draw air from these leaks will result in excess noncondensables (NCG) air being mixed with the recovered refrigerant. T
19、he excess noncondensables (NCG) is difficult to remove from the refrigerant and will result in pressures higher than normal in the recovery/recycle equipment. 4.4Close the valves in the service lines and then remove the service lines from the vehicle system. If the recovery equipment has automatic c
20、losing valves (quick couples), be sure they are operating properly. Proceed with the repair/service. 4.5Upon completion of refrigerant removal from the A/C system, determine the amount of lubricant removed during the process and replenish the system with new lubricant, which is identified on the A/C
21、 system label. Used lubricant should be discarded per applicable federal, state, and local requirements. 5.Service with a Manifold Gauge Set 5.1High-side, low-side, and center service hoses must have shutoff devices (e.g., valves) within 30 cm of the service ends. Valves must be closed prior to hose
22、 removal from the A/C system to prevent refrigerant loss to the atmosphere. 5.2During all service operations, service hose valves should be closed until connected to the vehicle A/C system or to the charging source to exclude air and/or contain the refrigerant. SAE J2211 Revised NOV1998 -3- 5.3When
23、the manifold gauge set is disconnected from the A/C system, or when the service hose is moved to another device that cannot accept refrigerant pressure, the gauge set hoses should be attached to the recycling equipment to recover the refrigerant from the hoses. 6.Supplemental Refrigerant Checking Pr
24、ocedure for Stored Portable Containers 6.1Certified recycling equipment and the accompanying recycling procedure, when properly followed, will deliver use-ready refrigerant. In the event that the full recycling procedure was not followed or the technician is unsure about the noncondensable gas conte
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