1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(
2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): LZFE, LZPU, LZPK, LZPGStandard Number: UL 1995Standard Title: Standard for Heating and Cooling EquipmentEdition Date: July 31, 2015Edition Number: 5Section / Paragraph Reference: 71.2 c) and 71.10Subj
3、ect: Correction of Fatigue Test PressureDECISION:71.2 When tested in accordance with Clause 71, a part or a complete system shall have sufficient strengthto withstand the pressure strength test requirements specified in the Strength tests, Clause 70. The testpressure utilized for Clause 70 shall be
4、the higher of:a)Two times the maximum normal working pressure, see Clause 34.8,b) Two times the maximum abnormal pressure developed (or setting of the pressure limitingdevice), see Clause 34.9,c)Three Two times the minimum design pressure specified in Table 85.1, ord) Two times the start-to-discharg
5、e value of the pressure-relief valve for equipment intended toutilize carbon dioxide (R744) in a secondary loop or a cascade system, or equipment not in thehigh-side of a transcritical system.71.10 Except as specified in Clause 71.11, the test pressure for the first cycle shall be the pressureidenti
6、fied in Clause 71.2 prior to multiplying by three two.RATIONALE FOR DECISION:This Certification Requirement Decision (CRD) is intended to correct the test pressure multiplying factorfrom “three times” to “two times” in Clauses 71.2 c) and 71.10.The 60335-2-40 Standard Technical Panel (STP), which is
7、 responsible for UL 1995, agreed to revise thefatigue test requirements to align with UL 60335-2-40, Annex EE.This CRD documents the corrected test pressure requirements.Copyright 2017 UL LLCUL LLC, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorre
8、ctness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of UL LLC. in practically applying therequirements of the standard. They do not represent formal interpretations of the standard underAm
9、erican National Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FR
10、OM ULobligation or liability for damages, including consequential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1995 -2-
