1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 12263:1999 The Euro
2、pean Standard EN 12263:1998 has the status of a British Standard ICS 27.080; 27.200 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Refrigerating systems and heat pumps Safety switching devices for limiting the pressure Requirements and testsThis British Standard, having been
3、prepared under the direction of the Engineering Sector Committee, was published under the authority of the Standards Committee and comes into effect on 15 April 1999 BSI 04-1999 ISBN 0 580 29284 3 BS EN 12263:1999 Amendments issued since publication Amd. No. Date Text affected National foreword This
4、 British Standard is the English language version of EN 12263:1998. The UK participation in its preparation was entrusted to Technical Committee RHE/18, Refrigeration safety, which has the responsibility to: aid enquirers to understand the text; present to the responsible European committee any enqu
5、iries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The Bri
6、tish Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A Briti
7、sh Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front
8、 cover, an inside front cover, the EN title page, pages 2 to 9 and a back cover.CEN European Committee for Standardization Comite Europe en de Normalisation Europa isches Komitee fu r Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1998 CEN All rights of exploitation in any form and
9、 by any means reserved worldwide for CEN national Members. Ref. No. EN 12263:1998 E EUROPEAN STANDARD EN 12263 NORME EUROPE ENNE EUROPA ISCHE NORM November 1998 ICS 27.080; 27.200 Descriptors: cooling systems, refrigerating, heat pumps, safety devices, pressure limiters, specifications, tests, testi
10、ng conditions, adjustment, instructions, marking English version Refrigerating systems and heat pumps Safety switching devices for limiting the pressure Requirements and tests Syste mes de re frige ration et pompes a chaleur Dispositifs-interrupteurs de se curite limitant la pression Exigences et es
11、sais Ka lteanlagen und Wa rmepumpen Sicherheitsschalteinrichtungen zur Druckbegrenzung Anforderungen und Pru fungen This European Standard was approved by CEN on 4 March 1998. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Eur
12、opean Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (Englis
13、h, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republ
14、ic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.Page 2 EN 12263:1998 BSI 04-1999 Foreword This European Standard has been prepared by Technical Committee CEN/TC 182, Refrigerating systems
15、, safety and environmental requirements, the Secretariat of which is held by DIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by May 1999, and conflicting national standards shall be withdrawn at
16、 the latest by May 1999. This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of the EU Directive 97/23/EC. For relationship with EU Directive(s), see informative annex ZA, which
17、is an integral part of this standard. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy
18、, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Contents Page Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 3 4 Requirements and tests 4 5 Installation and operating instructions 7 6 Marking 7 Annex A (informative) Symbols and equivalent
19、terms in English, French and German 8 Annex ZA (informative) Clauses of this European Standard addressing essential requirements or other provisions of EC Directives 9Page 3 EN 12263:1998 BSI 04-1999 1 Scope 1.1 This European Standard establishes the requirements and tests applied to safety switchin
20、g devices for limiting the pressure (hereafter called devices) to ensure that the maximum or minimum pressure, which is caused by a pressure generator in refrigerating systems and/or heat pumps, is maintained within the limits of the refrigerating system and/or heat pump. These devices are of specia
21、l construction and are equipped with mechanically operated output contacts. NOTE Devices may be wired directly into the control circuit of the compressor or may be connected through a relay or microprocessor/computer. Transducers/analogue devices are not covered by this standard. If more stringent s
22、pecifications for special applications are necessary, these should be agreed between the customer and the manufacturer of the devices. 1.2 Different safety and control functions can be combined in one device. 1.3 This standard does not apply to devices used for control purposes. 2 Normative referenc
23、es This European Standard incorporates, by dated or undated reference, provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these
24、 publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references, the latest edition of the publication referred to applies. EN 60529, Degrees of protection provided by enclosures (IP code). (IEC 529:1989) EN 60730-1:1995, Automatic electric
25、al controls for household and similar use Part 1: General requirements. (IEC 730-1:1993, modified) EN 60730-2-6:1995, Automatic electrical controls for household and similar use Part 2: Particular requirements for automatic electrical pressure sensing controls including mechanical requirements. (IEC
26、 730-2-6:1991, modified) EN 60947-5-1:1991, Low-voltage switchgear and controlgear Part 5: Control circuit devices and switching elements Section 1: Electromechanical control circuit devices. (IEC 947-5-1:1990) EN 60068-2-6, Environmental testing Part 2: Tests Test Fc: Vibration (sinusoidal). (IEC 6
27、8-2-6:1995 + corrigendum 1995) 3 Definitions For the purposes of this European Standard the following definitions apply. NOTE Symbols and equivalent terms are specified in annex A. 3.1 safety switching device for limiting pressure pressure-actuated device that is designed to stop the operation of th
28、e pressure generator NOTE These devices can be designed to limit the high pressure (H) or to limit the low pressure (L) to one predetermined value during abnormal operating conditions. 3.1.1 pressure limiter device which automatically resets NOTE 1 It is called PSH for high-pressure protection and P
29、SL for low-pressure protection (see annex A). NOTE 2 The devices automatically cut out when a set pressure limit is exceeded, and they automatically cut in again. 3.1.2 pressure cut-out device which is manually reset without the aid of a tool NOTE 1 It is called PZH for high-pressure protection and
30、PZL for low-pressure protection (see annex A). NOTE 2 The devices automatically cut out when a set pressure limit is exceeded and are manually reset without the aid of a tool. 3.1.3 safety pressure cut-out device which is manually reset only with the aid of a tool NOTE 1 It is called PZHH for high-p
31、ressure protection and PZLL for low-pressure protection (see annex A). NOTE 2 The devices automatically cut out when a set pressure limit is exceeded and are manually reset only with the aid of a tool. 3.2 cut-out pressure pressure at which the contacts in the control circuit open to stop the pressu
32、re generator NOTE This will occur with a rising pressure for high-pressure protection and a falling pressure for low-pressure protection. 3.3 cut-in pressure pressure at which the contacts in the control circuit close to start the pressure generator NOTE This will occur with a falling pressure for h
33、igh-pressure protection and a rising pressure for low-pressure protection, as well as by manual reset. 3.4 setting range pressure range within which the cut-out pressure can be set 3.5 upper switching pressure pressure at which the device switches during pressure rise (cut-out or cut-in)Page 4 EN 12
34、263:1998 BSI 04-1999 3.6 lower switching pressure pressure at which the device switches during pressure fall (cut-out or cut-in) 3.7 differential pressure difference between the upper and lower switching pressure NOTE For devices with manual reset, the lower or upper switching pressure will be that
35、at which the device is capable of being reset. 3.8 drift permanent alterations which can occur when a device has been tested under the conditions specified in this standard 3.9 deviation temporary alterations which disappear when the device is no longer subjected to the test conditions 3.10 maximum
36、declared pressure, p max pressure, declared by the manufacturer, to which the component or device may be subjected without reducing its performance 3.11 allowable temperature range range between the maximum and minimum ambient temperature within which the performance of the device is not reduced 4 R
37、equirements and tests 4.1 General requirements and test conditions Devices shall be so designed and constructed that in normal use they function so as to cause no danger to persons and surroundings, even in the event of any foreseeable misuse which may occur during operation. Unless otherwise specif
38、ied, all tests shall be carried out at an ambient temperature of 208Ct o2 58 C. For accuracy of measurement, the pressure applied to the device shall not change at a rate of more than 10 bar/min. Three samples of each type shall undergo and pass all the described tests. However, only two are used fo
39、r the burst test and the third for the test of fail-safe function of the measuring element. 4.2 Mechanical requirements 4.2.1 Design and endurance The materials used in the construction of the devices shall be able to withstand the thermal, mechanical and chemical stresses occurring in the range of
40、application for which the devices are provided. Corrosive effects, in particular, shall not affect the function of the devices. The design of the device shall ensure a snap-action characteristic of the contact system. Devices with automatic reset shall have a mechanical life of at least 5 000 switch
41、ing operations. Devices with manual reset shall withstand at least 500 reset operations. In addition, the devices shall withstand at least 50 000 pressure cycles without switching. 4.2.2 Devices with manual reset The manual reset shall be designed trip-free according to 2.3.15 of EN 60730-1:1995. Th
42、e reset mechanism shall be independent of other setting mechanisms. 4.3 Electrical requirements 4.3.1 Safety For electrical safety, the following clauses of EN 60730-2-6:1995 are applicable and the manufacturer shall declare compliance thereto: clause 8: Touch protection against electric shock; clau
43、se 9: Provision for protective earthing; clause 12: Moisture and dust resistance; clause 13: Electrical strength and insulation resistance; clause 14: Heating; clause 17.2: Electrical conditions for the tests; clause 19: Threaded parts and connections; clause 20: Creepage distances, clearances and d
44、istances through insulation; clause 21: Resistance to heat, fire and tracking. 4.3.2 Fuse protection The required fuse protection against short circuit shall be indicated by the manufacturer in accordance with 8.3.4 of EN 60947-5-1:1991. 4.4 Setting, range and accuracy 4.4.1 Set-point adjustment The
45、 cut-out pressure shall be shown on the device, either by marking of a fixed setting or by a scale indication on adjustable devices. On adjustable devices, changes of setting shall only be possible by means of a tool. It shall be possible to protect the devices against alteration of settings by unau
46、thorized persons. 4.4.2 Setting range High-pressure devices shall be protected against excessive set-point adjustment above the maximum set-point range. This protection shall not allow a cut-out pressure higher than the maximum range value +15 % or +3 bar, whichever is the greater. 4.4.3 Accuracy of
47、 setting The accurate setting of the upper and lower switching pressures shall be established by means of a suitable pressure gauge, because the setting scales show only approximate values.Page 5 EN 12263:1998 BSI 04-1999 Devices with fixed factory setting for high-pressure protection shall have a c
48、ut-out pressure kept within a deviation of 0 bar to20,25 bar or 0 % to28 % of the specified settings, whichever is the greater. Devices with fixed factory setting for low-pressure protection shall have a cut-out pressure kept within a deviation of 0 bar to +0,25 bar or 0 % to +8 % of the specified s
49、ettings, whichever is the greater. 4.5 Tests: pressure overload, ambient temperature, mechanical endurance 4.5.1 Preparation Adjustable devices shall be set to mid-range and mid-differential. Devices with fixed settings shall be supplied having mid-range and mid-differential settings. A reference value for upper and lower switching pressures is to be measured and shall be applied in the tests required by the following subclauses of 4.5. 4.5.2 Drift and deviation of cut-out Drift and deviation of cut-out
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