1、STD.CEN EN L22h3-ENGL 1778 3404589 O18874b T22 RATIFIED EUROPEAN TEXT EN1226331998 European Standards only exist formally as national transpositions (Le. a BS EN for the UK) of a commonly agreed “ratified” text. This document is a ratified text which will shortly be published as a BS EN. It is being
2、 made available in advance of its formal publication to give interested parties early access to the technical information which the BS EN will contain. When the BS EN is formally published it will be supplied to you automatically, without any additional charge. Purchasers of this ratified text shoul
3、d be aware of the following limitations when using the document. O The BS EN may contain additional information in the national foreword or national annex, O Full rights conferred by compliance with the standard may only be granted by reference to the formal national transposition of the text as a B
4、S EN. This ratified text was approved by CENKENELEC in its three official languages on the date given below. Under CENICENELEC rules, BSI is obliged to publish its national transposition within six months of this date. This ratified text was approved on 1998-03-04 NO COPYING WITHOUT BSI PERMISSION E
5、XCEPT AS PERMITTED BY COPYRIGHT LAW STD-CEN EN 122b3-ENGL 1778 m 3404587 0388747 7b7 m EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 12263 November 1998 ICs 27.080; 27.200 Descriptors: cooling systems, refrigerating, heat pumps, safety devices, pressure limiters, specifications, tests, testin
6、g conditions, adjustement, instructions, marking English version Refrigerating systems and heat pumps - Safety switching devices for limiting the pressure - Requirements and tests Systbmes de rfrigration et pompes chaleur - Dispositifs-interrupteurs de scurit limitant la pression - Exigences et essa
7、is Klteanlagen und Wrmepumpen - Sicherheitsschalteinrichtungen zur Druckbegrenzung - Anforderungen und Prfungen This European Standard was approved by CEN on 4 March 1998. CEN members are bound to comply with the CEWCENELEC Internal Regulations which stipulate the conditions for giving this European
8、 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 officiai versions (English, Fr
9、ench, 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 Republic, D
10、enmark, Finland, France, Germany. Greece, Iceland, Ireland. Italy. Luxembourg, Netherlands. Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN COMMlTTEE FOR STANDARDIZATION COMIT EUROPEEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36
11、8-1050 Brussels O 1998 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 12263:1998 E STD-CEN EN 122b3-ENGL 1798 M 3q134587 0388748 8T5 M Page 2 EN 12263: 1 998 Contents Foreword . 2 1 Scope . 3 2 Nonnative references 3 3 Definitions
12、 3 4 Requirements and tests 5 5 Installation and operating instructions 11 6 Marking . 11 Annex A (informative) Symbols and equivalent terms in English, French Annex ZA (informative) Clauses of this European Standard addressing Page and German 12 essential requirements or other provisions of EC Dire
13、ctives 13 Foreword This European Standard has been prepared by Technical Committee CENiC 182 “Refrigerating systems, 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 i
14、dentical text or by endorsement, at the latest by May 1999, and conflicting national standards shall be withdrawn at 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 essentia
15、l requirements of the EU Directive 97/23/EC. For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this standard. According to the CENKENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this Euro
16、pean Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. STD-CEN EN 222b3-ENGL 1778 m 3404587 0188749 731 m Page 3 EN 12263: 1998 1 Scope 1.1 This
17、 European standard establishes the requirements and tests applied to safety switching devices for limiting the pressure - here aiter called devices - to ensure that the maximum or minimum pressure, which is caused by a pressure generator in refrigerating systems andor heat pumps, is maintained withi
18、n the limits of the refrigerating system and/or heat pump. These devices are of special construction 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 rnicroprocessorkomputer. Tra
19、ncducerdanalogue devices are not covered by this standard. If more stringent specifications for special applications are necessaty, 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 stan
20、dard does not apply to devices used for control purposes. 2 Normative references This European Standard incorporates, by dated or undated reference, provisions from other publications. These notmative references are cited at the appropriate places in the text and the publications are listed hereafte
21、r. For dated references, subsequent amendments to or revisions of any of these 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 provide
22、d by enclosures (IP code) (IEC 529 : 1989) EN 60730-1 : 1995 Automatic electrical 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 a
23、utomatic electrical pressure sensing controls including mechanical requirements (IEC 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 : 19
24、90) EN 60068-2-6 Environmental testing - Part 2: Tests -Test Fc: Vibration (sinusoidal) (IEC 68-2-6 : 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. STD.CEN EN 122b3-ENGL
25、1998 3404587 0188750 453 Page 4 EN 12263: 1998 3.1 safety switching device for limiting pressure: Pressure actuated device that is designed to stop the operation of the pressure generator. NOTE: These devices can be designed to limit the high pressure (H) or to limit the low pressure (L) to one pred
26、etetmined 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 PSL for low pressure protection (see annex A). NOTE 2: The devices automatically cut out when a set pressure limit is exceeded an
27、d 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 PZL for low pressure protection (see annex A). NOTE 2: The devices automatically cut out the pressure when a set pressure lim
28、it 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 pressure protection and PZLL for low pressure protection (see annex A). NOTE 2: The devices automatically cut
29、 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 pressure generator. NOTE: This will occur with a rising pressure for high pressure protection and a falling pres
30、sure for low pressu re 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 high pressure protection and a rising pressure for low pressure protection as well as by manual reset
31、. 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). I I 3.6 lower switching pressure: Pressure at which the device switches during pressure fall (cut out or cut
32、 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 at which the device is capable of being reset. 3.8 drift: Permanent alterations which can occur when a device has been te
33、sted under the conditions specified in this standard. Page 5 EN 12263:1998 3.9 deviation: Temporary alterations which disappear when the device is no longer subjected to the test conditions. 3.10 maximum declared pressure, pmX: Pressure declared by the manufacturer of the component or device to whic
34、h it may be subjected without reducing its performance. 3.1 1 allowable temperature range: Range between the maximum and minimum ambient temperature within which the performance of the device is not reduced. 4 Requirements and tests 4.1 General requirements and test conditions Devices shall be so de
35、signed 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 specified all tests shall be carried out at an ambient temperature of 20 OC to 25 “C. For accur
36、acy of measurement the pressure applied to the device shall not change at a rate of more than 10 badmin. Three samples of each type shall undergo and pass all the described tests. However, only two are used for the burst test and the third for the test of fail-safe function of the measuring element.
37、 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 application for which the devices are provided. Corrosive effects, in particular, shall not
38、 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 O00 switching operations. Devices with manual reset shall withstand at least 500 reset operations. In
39、 addition the devices shall withstand at least 50 O00 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. The reset mechanism shall be independent of other setting mechanisms. 4.3 Electrical require
40、ments 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; - clause 9: Provision for protective earthing; - clause 12: Moisture and dust resistance; P
41、age 6 EN 12263: 1998 - 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 distances through insulation; - clause 21: Resistanc
42、e to heat, fire and tracking. 4.3.2 Fuse protection The required fuse protection against short circuit shall be indicated by the manufacturer in accordonce with 8.3.4. Of EN 60947-5-1 : 1991. 4.4 Setting, range and accuracy 4.4.1 Set point adjustment The cut out pressure shall be shown on the device
43、 either by marking of fixed setting or by a scale indication on adjustable devices. On adjustable devices setting changes shall only be possible by means of a tool. It shall be possible to protect the devices against alteration of settings by unauthorized persons. 4.4.2 Setting range High pressure d
44、evices 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 YO or + 3 bar, whichever is the greater. 4.4.3 Accuracy of setting The accurate setting of the upper and low
45、er switching pressures shall be established by means of a suitable pressure gauge because the setting scales are showing only approximate values. Devices with fixed factory setting for high pressure protection shall have a cut out pressure kept within a deviation of O bar to - 0,25 bar or O % to - 8
46、 YO 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 O bar to + 0,25 bar or O % to + 8 Y of the specified settings, whichever is the greater. 4.5 Tests: pressure overload, ambi
47、ent 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 setting. A reference value for upper and lower switching pressures is to be measured and shal
48、l be applied in the tests required by the following clauses of 4.5. STD.CEN EN L22b3-ENGL 1998 9 3404589 0388753 Lb2 W Page 7 EN 12263:1998 4.5.2 Drift and deviation of cut out Drift and deviation of cut out from the reference value shall not exceed the following: - for devices for high pressure pro
49、tection: reference value + 0,25 bar or + 5 %, whichever is the greater; - for devices for low pressure protection: reference value - 0,25 bar or - 5 Yo, whichever is the greater. Drift in the safe direction shall not exceed twice the above mentioned tolerances. 4.5.3 Pressure overload The devices are exposed to - 0,95 bar or lower (vacuum) for 1 min. 50 pressure variations between O bar and 1,l times the maximum declared pressure are then applied and the cut out pressure drift is determined by comparison with the reference value. 4.5.4 Ambient temperature The devices are su
