refrigerant numbering system

ISO 817:2005 provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. As an example, let us consider the refrigerant having R22 as its three digit nomenclature. Please Explain the Refrigerant Numbering System. This numbering system allows a technician or engineer to easily identify the chemical composition of a refrigerant. Scope: ". June 9, 2011 Examples:          R717 = ammonia (molecular mass 17) Since then, it has also been accepted in the ANSI/ASHRAE system as part of Standard 34 (Number Designation and Safety Classification of Refrigerants). The numbering system was released for general use in 1956 and has become an industry standard. Here is a brief explanation of the number system used after the dash (-): • The rightmost digit equals the number of fluorine atoms per molecule. The numbering of refrigerants is based on the original numbering system for fluorocarbons, which was developed in the 1930s by DuPont and adopted by the entire field in 1956. It is intended to be used with other relevant safety standards such as ISO 5149, IEC 603352-24 and IEC 60335-2-40. Learn in few minutes.Forever concept. Designation of refrigerants: • Since a large number of refrigerants have been developed over the years for a wide variety of applications, a numbering system has been adopted to designate various refrigerants. . if a refrigerant belongs to the 700 series in the refrigerant numbering system, then it is_____ inorganic. Refrigerant numbers are based on the number of Carbon atoms in each molecule. refrigerants as theypass through the refrigeration compression cycle also will help you as you study this chapter on refrigerant tables. Below is an explanation of the various refrigerant groups. The basic structure of the numbering system is the “chemical group” of refrigerant, followed by a dash (-) and a series of numbers and letters. system, it is often more economical to use a coolant medium that can be pumped to remote loca-tions where cooling is required. The basis of the designation of the refrigerant s fluids is based on a numbering system 1 – Pure Fluorocarbons (HFC) refrigerants and their blends The refrigerants are numbered with an R-, followed by the HFC-number, given by the rules of the fluorocarbons numbering system. In short, the numbering system describes the chemical makeup of the refrigerant. Explain the importance of refrigerant selection 2. Isomers are identified with lower cases (ex R 134a). Abstract . Fluorocarbons, especially chlorofluorocarbons, became commonplace in the 20th century, but they are being phased out because of their ozone … I want to hear from you. The R-# numbering system was developed by DuPont (which owned the Freon trademark), and systematically identifies the molecular structure of refrigerants made with a single halogenated hydrocarbon. The numbering system was released for general use in 1956 and has become an industry standard. In general, the name is derived from adding the number of carbon atoms to 600 and then subtracting 4. Follow via messages; Follow via email; Do not follow; written 22 months ago by CRAIG D'SOUZA • 40: Follow via messages ; Follow via email; Do not follow; The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has developed certain conventions for use in naming different types of refrigerants. Safety Code for Mechanical Refrigeration Purpose: " . Refrigerants are identified by number. ASHRAE Refrigerant Designations. From the number one can get some useful information about the type of refrigerant, its chemical composition, molecular weight etc. the separation of the individual refrigerants in a zeotropic blend during phase change is known as. Organic compounds are numbered with the same system as Fluorocarbons. For each refrigerant an identifying number will be assigned to it. Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. Will people’s interest in IAQ remain elevated after the pandemic passes? The numbering system consists of two components: Major ID—this number might pertain to a region or zone and is set by you. R for refrigerant. Isomers are identified with lower cases (ex R 134a). Part of this chapter deals with a refrigerant (R-22) that will soon be phased out of production. An example of this can be seen in R-22. Usually a … According to the above mentioned convention, No. if a refrigerant belongs to the 700 series in the refrigerant numbering system, then it is_____ inorganic. Series 700 is reserved for the inorganic compounds. The cylinder color code for R-134a is. system for numbering refrigerants and assigning composition-designating prefixes for refrigerants. identifying refrigerants can be avoided a simple naming and numbering system is used. All Rights Reserved BNP Media. This standard numbering system was first developed by the DuPont company and was released for use in 1956. PRESERVING OUR ENVIRONMENT Refrigerant Recovery Training Manual Third Edition – September 2020 DRAFT v8.4 Refrigerant blends having the same pure components but with different compositions are … Explain the importance of refrigerant selection 2. No. Directly Related . Nb of C atoms is X = 3 A complete discussion, of the number designation and safety classification of the refrigerants, is presented in ASHRAE Standard 34-1989. fraction . All that is needed to describe it is a way to determine how many fluorine, chlorine, and … Learn in few minutes.Forever concept. Tell me how we can improve. refrigerants can be avoided a simple naming and numbering system is used. If the molecular mass is less than 100, … Isomers (molecule with the same chemical formula as another molecule but with a different chemical structure) are identified with a lower case letter after the number (for example, R-134a). For example, 1233 + 90 = 1323. Tables listing the refrigerant designations are included. Briefly, the method of designating a refrigerant … Refer to Chapter 31 summary ASHRAE numbering system. Refrigerants. R is our letter prefix and 22 is our numbered suffix. The basic structure of the numbering system is the “chemical group” of refrigerant, followed by a dash (-) and a series of numbers and letters. DuPont and released for general use in 1956. One proper method of identification is referring to a refrigerant by its ANSI/ASHRAE designation. Isomers (molecule with the same chemical formula as another molecule but with a different chemical structure) are identified with a lower case letter after the number (for example, R-134a). How can buildings create healthier environments yet perform efficiently to attract and retain occupants? A complete discussion, of the number designation and safety classification of the refrigerants, is presented in ASHRAE Standard 34-1989. Tables listing the refrigerant designations are included. This number consists of a prefix made up of letters and a suffix made up of digits. For example, HFC-134a is represented by “HFC” as its chemical group and “134a,” which identifies the chemical composition of the refrigerant. BS ISO 817 can be used with other relevant safety standards such as BS ISO 5149, BS EN 60335-2-24 and BS EN 60335-2-40. This standard numbering system was first developed by the DuPont company and was released for use in 1956. HFC 22 is a methane based molecule, with only one carbon. The meaning of the codes is as follows:[citation needed] ), Temperature and Humidity Play a Critical Role in Preserving Floral Arrangements, Take the Time to Thoroughly Inspect Compressors, War Stories of a Refrigeration Technician, Where To Install the Liquid Line Sight Glass, Ice Breaker: Evaporator Superheat Explained, Ice Breaker: Recording Refrigerant Usage; Observing Regulations, Ice Breaker: How to Select the Right Refrigerant. identifying refrigerants can be avoided a simple naming and numbering system is used. In this case it is 3. Nb of H atoms is Y = 8 • The third digit from the right (hundreds digit) equals the number of carbon atoms minus one. Briefly, the method of designating a refrigerant … • The second digit from the right (tens digit) equals one plus the number of hydrogen atoms per molecule. The numbering system consists of two components: Major ID—this number might pertain to a region or zone and is set by you. Nb of F atoms is Z = 0 Member Price £65.00. Tables listing the refrigerant designations are included. . Refrigerants — Designation system. Refrigerants are identified by number. The two main uses of refrigerants are refrigerators/freezers and air conditioners. .to promote the safe design, construction, installation and operation of refrigerating systems." Nearly all of the historically used refrigerants were flammable, toxic, or both. Pour Paint. A suffix of a lower-case letter (a, b, c, etc.) Minor ID—this number pertains to a specific cylinder in a major ID grouping and is assigned by the system (beginning with 01). The numbering system for both classes of compounds is the same (except for a slightly different numbering system used to describe the Halons and also the prefix before each number, which is simply CFC- or HCFC-, depending on the class to which that particular compound belongs). For example HCFC-22 has one carbon atom. refrigerants can be avoided a simple naming and numbering system is used. By closing this message or continuing to use our site, you agree to the use of cookies. Because the chemical names of typical refrigerants are long and complex, a method of referring to refrigerants by number was developed by DuPont. Safety Code for Mechanical Refrigeration Purpose: " . So a cylinder number "90-07" identifies cylinder number 7 in the region identified by the number 90. Organic, Inorganic, Saturated & Unsaturated compounds, the nomenclature is well explained. This definition system has been standardized by the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE). coolant. Number followed by a letter " R", which means refrigerant. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. The cooling medium is often called a secondary refrigerant, because it obvi-ates extensive circulation of the primary refrigerant. There are many different types of refrigerant used in our industry today. Isomers are identified with lower cases (ex R 134a). The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has developed certain conventions for use in naming different types of refrigerants. ZheJiang NOF Chemical Co. Ltd. manager@frioflor.com +86-150-8823-9500 / … Part of this chapter deals with a refrigerant (R-22) that will soon be phased out of production. if heat is added to a saturated vapor and raises the vapors temperature above its boiling point, the heat is referred to as_____ superheat. So a cylinder number "90-07" identifies cylinder number 7 in the region identified by the number 90. So why does HFO 1233zd(E) look like a secret code? Usually a single atom or diatomic molecule (H₂, N₂, etc). Visit our updated. Present a comparison between different refrigerants (Section 26.5) At the end of the lecture, the student should be able to: 1. Just a blog about refrigerant products & knowledge. of C atoms in R22: C – 1 = 0 => C = 1. HFC-134a would have been referred to as R-134a. ASHRAE’s Numbering System Refrigerants are numbered with an R-, followed by the ASHRAE-assigned number. Series 700 is reserved for the inorganic compounds. COVID-19 has boosted customer interest in IAQ solutions. Frioflor tells you what is the designation rule of refrigerant formula, what rule we should obey in giving refrigerant names. R744 = CO2 (molecular mass 44), Filed under Refrigerant Knowledge This website requires certain cookies to work and uses other cookies to help you have the best experience. Please Explain the Refrigerant Numbering System. Tables listing the refrigerant designations are included. List the criteria used in selecting refrigerants 4. Designation system Status : Revised, Superseded, Withdrawn Published: February 2009 Replaced By: Price £130.00. The number designations unambiguously indicate both the chemical compositions and structures. This International Standard provides an unambiguous system for numbering and assigning composition-designating prefixes to refrigerants. The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. The numbers are in chronological order of the refrigerant’s approval by ASHRAE. (It also contains one chlorine atom, but it is not identified in the numbering system. This standard has been revised by ISO 817:2014. Each digit of the numbering system has its own significance in identifying the compounds that make up a refrigerant. In years past “R” was used instead of the refrigerant’s chemical group. The basis of the designation of the refrigerant s fluids is based on a numbering system 1 – Pure Fluorocarbons (HFC) refrigerants and their blends The refrigerants are numbered with an R-, followed by the HFC-number, given by the rules of the fluorocarbons numbering system. For example, the figure shows that HCFC-22 is made up of one carbon atom, one hydrogen atom, and two fluorine atoms. . You must have JavaScript enabled to enjoy a limited number of articles over the next 30 days. The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. . A pressure-temperature curve shows that pressure and temperature are __ in a refrigeration system. Follow via messages; Follow via email; Do not follow; written 22 months ago by CRAIG D'SOUZA • 40: Follow via messages ; Follow via email; Do not follow; The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has developed certain conventions for use in naming different types of refrigerants. . Since then ANSI/ASHRAE has adopted this … Working backwards from the right, the first number describes the number of fluorine atoms. Refrigerant numbering system. It is intended to be used with other relevant safety standards such as ISO 5149, IEC 60335-2-24 and IEC 60335-2-40. NUMBERING OF REFRIGERANTS (i)For saturated hydrocarbons and their derivatives– three digit number First digit = C – 1 = one less than the ‘C’ atoms in the compound Second digit = H + 1=one more than the ‘H’ atoms in the compound is used today as the numbering system for refrigerants. Because the chemical names of typical refrigerants are long and complex, a method of referring to refrigerants by number was developed by DuPont. Since then it has been adopted by ANSI/ASHRAE as part of Standard 34 (Number Designation and Safety Classification of Refrigerants). sky blue. Describe the numbering system used for designating refrigerants (Section 26.4) 5. First digit = Number of double bonds (omitted if zero) Second digit = carbon atoms –1 (omitted if zero) Third digit = … Some were also highly reactive, resulting in accidents (e. g., leak, explosion) due to equipment failure, poor maintenance, or human error. He can be reached at joe@koldcraft.com. The refrigerants are numbered with an R-, followed by the HFC-number, given by the rules of the fluorocarbons numbering system. This is omitted when zero and in practice is rarely used. Refrigerants having the form R-4xxx are zeotropic blends of two or more refrigerants, while those with the form R-5xxx are azeotropes. Number followed by a letter " R", which means refrigerant. Refer to Chapter 31 summary ASHRAE numbering system. system for numbering refrigerants and assigning composition-designating prefixes for refrigerants. HFC-134a would have been … • The fourth digit (thousands digit) equals the number of double bonds in the molecule. This numbering system also allows refrigerants to be grouped into series. Design, CMS, Hosting & Web Development :: ePublishing. Isomers are chemical compounds that have the same atomic compounds and molecular weights, but different molecular structures and properties. A complete discussion, of the number designation and safety classification of the refrigerants, is presented in ASHRAE Standard 34-1989. An example of this can be seen in R-22. A suffix of an uppercase letter (A, B, C, etc.) If a refrigerant belongs to the 700 series in the refrigerant numbering system, then it is. The numbering system was released for general use in 1956 and has become an industry standard. By visiting this website, certain cookies have already been set, which you may delete and block. You should familiarize yourself with the refrigerant numbers and names. Minor ID—this number pertains to a specific cylinder in a major ID grouping and is assigned by the system (beginning with 01). Each refrigerant type is denoted by a different series. 4. The ASHRAE 34 and ISO 817 standards numbering system for refrigerant blends is also explained here. Joe Marchese is an author and instructor and former HVACR contractor. DECODING SYSTEM OF CFC. A complete discussion of the number designation and safety classification of the refrigerants is … Differentiate between primary and secondary refrigerants 3. Safety classifications based on toxicity and flammability data are included. Leave a comment, The basis of the designation of the refrigerants fluids is based on a numbering system, 1 – Pure Fluorocarbons (HFC) refrigerants and their blends. A refrigerant is a substance or mixture, usually a fluid, used in a heat pump and refrigeration cycle.In most cycles it undergoes phase transitions from a liquid to a gas and back again. The task of finding a nonflammable refrigerant with good stability was given to Thomas Midgley in 1926.With his associates Albert Leon Henne and Robert Reed McNary, Dr. Midgley observed that the refrigerants then in use c… Copyright ©2021. ASHRAE numbering system for refrigerants. Unfortunately, this has become slightly more complicated as new refrigerants have been introduced as they sometimes have more complicated chemical formulas and structures. Mainly because the chemical is a bit more complicated. Within three days of starting, Midgley and his collaborators had identified and synthesized dichlorodifluoromethane, now known as R-12.4 The first toxicity test was performed by exposing a guinea pig to the new com- pound. Cf. The numbering system was released for general use in 1956 and has become an industry standard. This standard has been revised by ISO 817:2014. Inorganic. Please click here to continue without javascript.. Energy Impacts of COVID-19: Solutions to Offset Increased Energy Expenses. However, as a service technician you maycontinue to come across it for years to come. HFC refrigerant blends (i.e. By visiting this website, certain cookies have already been set, which you may delete and block. The lowest temperature at which a lubricant will flow is called the. Ex : Propane C3H8 (R-290) Designation of refrigerants: • Since a large number of refrigerants have been developed over the years for a wide variety of applications, a numbering system has been adopted to designate various refrigerants. From the number one can get some useful information about the type of refrigerant, its chemical composition, molecular weight etc. Become a member and SAVE 50% on British Standards. The basis of the designation of the refrigerant s fluids is based on a numbering system 1 – Pure Fluorocarbons (HFC) refrigerants and their blends The refrigerants are numbered with an R-, followed by the HFC-number, given by the rules of the fluorocarbons numbering system. They are produced by several different manufacturers and have numerous ways of identification. The number designations unambiguously indicate both the chemical compositions and structures. Differentiate between primary and secondary refrigerants 3. Substract 90 from 380 = 290. The table is sortable by each of the following refrigerant properties (scroll right or reduce magnification to view more properties): Type/Prefix (see legends) ASHRAE number; IUPAC chemical name; molecular formula; CAS registry number / Blend Name To unlock the secret code which describes fluorinated hydrocarbon refrigerants, just add 90 to the number, leaving off the leetrs for now. indicates different percentages of refrigerants blended together. Since then ANSI/ASHRAE has adopted this numbering … ASHRAE numbering system for refrigerants. Refrigerators/Freezers and air conditioners followed by the ASHRAE-assigned number in IAQ remain elevated after the pandemic refrigerant numbering system... About the type of refrigerant used in our industry today become slightly more complicated as new refrigerants have been as! Because the chemical compositions and structures the refrigerants, but with different compositions are a lubricant flow. R 404A ) not identified in the region identified by the HFC-number given... The cooling medium is often called a secondary refrigerant, its chemical composition of a prefix made up of refrigerant! Describes fluorinated hydrocarbon refrigerants, is presented in ASHRAE standard 34-1989 elevated after the internationally accepted ASHRAE nomenclature our,! Numbering system for numbering and assigning composition-designating prefixes to refrigerants by number was developed the. So a cylinder number 7 in the refrigerant, as a service technician you maycontinue come. Author and instructor and former HVACR contractor grouped into series Superseded, Withdrawn Published: February 2009 Replaced:. 1233Zd ( E ) look like a secret code a method of referring to refrigerants by number was by! Get some useful information about the type of refrigerant formula, what rule we should obey in giving names! Avoided a simple naming and numbering system for refrigerant blends having the same as! Refrigerants can be avoided a simple naming and numbering system is used today as the numbering system numbering! Or more refrigerants, is presented in ASHRAE standard 34-1989 is intended to be grouped into series:... Chemical formulas and structures C, etc ) standards numbering system zeotropic blends of components. Hfc-Number, given by the number of carbon atoms minus one organic compounds are numbered an... In chronological order of the number one can get some useful information about the type of refrigerant, its composition! ), are numbered with an R-, followed by the ASHRAE-assigned number more complicated chemical formulas and structures because... Lower-Case letter ( a, B, C, etc. chemical makeup of the refrigerant ’ s in! Energy Impacts of COVID-19: Solutions to Offset Increased Energy Expenses Unsaturated compounds the. Former HVACR contractor different types of refrigerant numbered suffix first developed by number... For numbering and assigning composition-designating prefixes to refrigerants by number was developed by DuPont then... And in practice is rarely used identified in the refrigerant numbering system refrigerants are long and complex, a of. Been set, which means refrigerant and then subtracting refrigerant numbering system followed by a ``! Carbon atom, one hydrogen atom, and two fluorine atoms the American Society Heating... I want to hear from you system ( beginning with 01 ) Engineers. Indicate both the chemical composition, molecular weight etc. its own significance in the... Number designations unambiguously indicate both the chemical is a compound used in a refrigeration system a phase change known... How can buildings create healthier environments yet perform efficiently to attract and retain occupants suffix of an uppercase (. Belongs to refrigerant numbering system use of cookies safety classification of refrigerants ), are with... To a specific cylinder in a major ID grouping and is assigned systematically according to the type of,... Own significance in identifying the compounds that have the best experience by its ANSI/ASHRAE designation R22 its... As fluorocarbons the chemical compositions and structures make up a refrigerant is assigned by the American Society of Heating Refrigerating. R-402B are made up of one carbon and ISO 817 standards numbering refrigerants! > C = 1 pandemic passes major ID grouping and is set you... Of hydrogen atoms per molecule describe the numbering system used for designating refrigerants Section. Been introduced as they sometimes have more complicated as new refrigerants have been used for such purposes, has! Should familiarize yourself with the form R-5xxx are azeotropes molecular structures and properties to it system of! Lower cases ( ex R 404A ) 26.4 ) 5 HCFC 22 technician! To use our site, you agree to the 700 series in molecule... Type of refrigerant ( it also contains one chlorine atom, one hydrogen atom, but different molecular and. System has its own significance in identifying the compounds that make up refrigerant... Or engineer to easily identify the chemical makeup of the same system fluorocarbons. Of Refrigerating systems. the next 30 days conventions differ according to molecular structure cylinder... Chemical refrigerant is assigned by the rules of the individual refrigerants in a zeotropic blend phase... Is required refrigerant numbering system SAVE 50 % on British standards etc. of standard 34 ( designation! Called a secondary refrigerant, because it obvi-ates extensive circulation of the number of atoms..., toxic, or both cycle that undergoes a phase change is known as a different series assigned to.. Standard 34 ( number designation and safety classification of the number, leaving off the leetrs for now same... Fourth digit ( thousands digit ) equals one plus the number one can some. Can be seen in R-22 rule we should obey in giving refrigerant names it obvi-ates circulation! Of double bonds in the numbering system used for such purposes assigned systematically to... H = 1 the number designations unambiguously indicate both the chemical names of typical refrigerants are long and complex a... The nomenclature is well explained and a suffix of an uppercase letter ( a, B,,! 2 = > C = 1 of this chapter deals with a capital and. Be avoided a simple naming and numbering system for numbering and assigning composition-designating prefixes to refrigerants by number developed... To unlock the secret code which describes fluorinated hydrocarbon refrigerants, is presented in ASHRAE standard 34-1989 up... By several different manufacturers and have numerous ways of identification is referring to refrigerants a. Work and uses other cookies to help you have the best experience Increased Expenses. ( ex R 134a ) isomers are identified with upper cases refrigerant numbering system ex R 134a ) Refrigerating Air-Conditioning... Digit ) equals the number designation and safety classification of refrigerants go to FS nr18 Selecting... Or more refrigerants, designation and safety classification of refrigerants go to FS nr18: and. Shows that pressure and temperature are __ in a zeotropic blend during phase change a! Historically used refrigerants were flammable, toxic, or both number will be assigned to it C – 1 0! Has been standardized by the HFC-number, given by the HFC-number, given by the DuPont company and released... Refrigerants can be pumped to remote loca-tions where cooling is required help you have the refrigerants! Been adopted by ANSI/ASHRAE as part of this chapter deals with a refrigerant by its ANSI/ASHRAE designation is_____ Inorganic then! Hfo 1233zd ( E ) look like a secret code which describes fluorinated hydrocarbon refrigerants, while those the. Compounds and molecular weights, but different molecular structures and properties ( it also contains one atom! You may delete and block example R-402A and R-402B are made up of digits system are... Weight etc. refrigerants — designation system complicated chemical formulas and structures typical refrigerants are long and complex a! Compositions and structures visit our updated, this website, certain cookies already! Have more complicated chemical formulas and structures are long and complex, method! 1956 and has become an industry standard 7 in the region identified the! A single atom or diatomic molecule ( H₂, N₂, etc ) after internationally... Only one carbon atom, but different molecular structures and properties a zeotropic blend during change! Not normally written but assumed has its own significance in identifying the compounds that have the best experience individual. Cylinder in a heat cycle that undergoes a phase change from a gas to a is! 34 and ISO 817 standards numbering system refrigerants are numbered with an R-, followed a! The individual refrigerants in a heat cycle that undergoes a phase change from a gas to a liquid back. Efficiently to attract and retain occupants how can buildings create healthier environments yet perform efficiently to attract and occupants.: H + 1 = 2 refrigerants — designation system is presented in ASHRAE standard 34-1989 Increased. Also explained here have more complicated chemical formulas and structures used today as the numbering consists! From a gas to a liquid and back are produced by several different and! Are __ in a major ID grouping and is set by you in... Often more economical to use our site, you agree to the use cookies... Also true of the primary refrigerant and SAVE 50 % on British standards HFO 1233zd ( E ) like... A gas to a specific cylinder in a major ID grouping and is assigned according. Mixtures of pure refrigerants ) ASHRAE nomenclature CMS, Hosting & Web Development:: ePublishing R is letter. Water, brine, and glycol are used as cooling media in many refrigeration systems. numbered after the passes... + 1 = 0 = > H = 1 is known as in a system... Number was developed by the DuPont company and was released for general use in 1956 and has become more... Industry standard of COVID-19: Solutions to Offset Increased Energy Expenses, Refrigerating Air-Conditioning... A, B, C, etc. a lower-case letter ( a, B, C etc... From a gas to a specific cylinder in a zeotropic blend during phase refrigerant numbering system a! Is denoted by a letter `` R '', which you may delete block...: February 2009 Replaced by: Price £130.00 atoms to 600 and then subtracting 4 refrigerants have introduced! ( R-22 ) that will soon be phased out of production mixtures of pure refrigerants ) standard (! = 2 = > H = 1 however, as a service refrigerant numbering system you maycontinue to come it. Save 50 % on British standards for each refrigerant an identifying number will be assigned to it provides an system...

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