ari symbols

AHRI Standard 130 (formerly ARI 130)

2003 STANDARD for

GRAPHIC ELECTRICAL/ ELECTRONIC SYMBOLS FOR AIR-CONDITIONING AND REFRIGERATING EQUIPMENT

Price $10.00 (M) $20.00(NM) Copyright 2003, by Air-Conditioning, Heating, and Refrigeration Institute Printed in U.S.A. Registered United States Patent and Trademark Office

IMPORTANT

SAFETY DISCLAIMER AHRI does not set safety standards and does not certify or guarantee the safety of any products, components or systems designed, tested, rated, installed or operated in accordance with this standard/guideline. It is strongly recommended that products be designed, constructed, assembled, installed and operated in accordance with nationally recognized safety standards and code requirements appropriate for products covered by this standard/guideline. AHRI uses its best efforts to develop standards/guidelines employing state of the art and accepted industry practices. AHRI does not certify or guarantee that any tests conducted under its standards/guidelines will be non-hazardous or free from risk.

This standard supersedes ARI Standard 130-88.

TABLE OF CONTENTS

SECTION PAGE Section 1. Purpose ...................................................................................................................... 1 Section 2. Scope ......................................................................................................................... 1 Section 3. Definitions ................................................................................................................ 1 Section 4. Requirements .............................................................................................................. 1 Section 5. Fundamental Items .................................................................................................... 2 Section 6. Conductors, Connections and Connectors, and Connecting Devices ....................... 4 Section 7. Contacts, Switches, Contactors, Relays, Solenoids, and Switch Operating Devices .................................................................................. 6 Section 8. Transformers ........................................................................................................... 11 Section 9. Semiconductor Devices .......................................................................................... 12 Section 10. Motor Starters ......................................................................................................... 13 Section 11. Motor Starters ......................................................................................................... 15 Section 12. Lamps and Signaling Devices ................................................................................. 16 Section 13. Instruments .............................................................................................................. 17 Section 14. Rotating Machinery ............................................................................................... 17 Section 15. Conformance Conditions ........................................................................................ 19

FIGURES

Figure 1. Line Conventions for Diagrams ................................................................................ 2

APPENDICES

Appendix A. References - Normative ......................................................................................... 20 Appendix B. References – Informative ...................................................................................... 20

AHRI Standard 130 2003

1

GRAPHIC ELECTRICAL/ELECTRONIC SYMBOLS FOR AIR-CONDITIONING AND REFRIGERATING EQUIPMENT

Section 1. Purpose

1.1 Purpose. The purpose of this standard is to establish graphic symbols of commonly used electrical/electronic devices for air-conditioning and refrigerating equipment.

1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors and users.

1.2 Review and Amendment. This standard is subject to review and amendment as technology advances.

Section 2. Scope 2.1 Scope. This standard applies to all electrical/electronic devices, sub-assemblies and assemblies used within air-conditioning and refrigerating equipment. 2.2 Exclusions. This standard does not apply to all electrical/electronic devices, sub-assemblies and assemblies used within air-conditioning and refrigerating equipment.

Section 3. Definitions All terms in this document shall follow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration unless otherwise defined in this section. 3.1 Electrical/Electronic Diagram (Diagram). A Diagram which takes the form of one or more of the types as defined below.

3.1.1 Connection Diagram (Writing Diagram). A diagram which shows the connections of an installation or its devices. It may cover internal or external connections, or both, and contains such detail as is needed to make or trace connections that are involved. The Connection Diagram usually shows general physical arrangement of the devices.

3.1.2 Interconnection Diagram. A Diagram which shows only external connections between assemblies or equipment. The internal connections of the assemblies or equipment are usually omitted.

3.1.3 Schematic Diagram (Elementary or Ladder Diagram). A Diagram which shows, by means of graphic symbols, the electrical connections and

functions of a specific circuit arrangement. The schematic diagram facilitates tracing the circuit and its functions without regard to the actual physical size, shape, or location of the device.

3.2 Graphic Symbols. Representations used to show the functioning or interconnections of a circuit. A graphic symbol represents the function of a device in the circuit, for example, when a resistor is employed as a fuse, the fuse symbol is used. Graphic Symbols are correlated with parts lists, descriptions, or instructions by means of designations. A symbol shall be considered as the aggregate of all its parts. If there is no suitable symbol listed in this standard, additional symbols from IEEE Standard 315, ANSI/IEEE 280, and IEC Standard Publications 60617 and 60027-1 may be used.

3.2.1 Applications. Applications where shown are examples of preferred combinations of symbols.

3.3 Reference Designation. A combination of letters and numbers used on diagrams to identify and refer to a device without regard to its function. For Reference Designation information, see ANSI/IEEE 200-1975.

3.4 "Shall" or "Should". "Shall" or "should" shall be

interpreted as follows:

3.4.1 Shall. Where "shall" or "shall not" is used for a provision specified, that provision is mandatory if compliance with the standard is claimed. 3.4.2 Should. "Should" is used to indicate provisions which are not mandatory but which are desirable as good practice.

Section 4. Requirements 4.1 General Requirements for Graphic Symbols. The following covers basic criteria which are applicable to all graphic symbols.

4.1.1 IEC Identification. In this standard, graphic symbols that have been recommended by the International Electrotechnical Commission (IEC) are indicated by IEC. Symbols indicated by IEC may have been constructed from two or more IEC symbol elements necessary to describe the specific application.


2

4.1.2 Alternative Symbols. When alternative symbols are shown, the relative position of the symbols does not imply a preference; however, alternative symbols identified as IEC are recommended.

4.1.3 Applications. No attempt has been made to list all possible applications. Additional applications may be devised provided they reasonably and intelligibly make use of other symbols.

4.1.4 Orientation. Except where noted, the orientation of a symbol on a drawing, including a mirror-image presentation, does not alter the meaning of the symbol. Letters and numbers that constitute a part of a symbol shall not be presented in mirror-image form.

4.1.5 Line Convention.

4.1.5.1 Line thickness and lettering size shall take into account the diagram size and the reproduction process, when it is felt that legibility may be affected.

4.1.5.2 Solid lines shall represent factory wiring and dashed lines shall represent field wiring when both are shown on the same diagram (Figure 1). If additional line conventions are used, they shall be identified in the legend.

FACTORY WIRING FIELD WIRING

__________----------

Figure 1. Line Conventions For

Diagrams

4.1.6 Symbol Size. Graphic symbols shall be drawn to any proportional size that suits a particular diagram, provided the selection of sizes takes into account the anticipated reproduction process.

4.1.7 Addition of Supplementary Data. Details of type, impedance, rating, etc., may be added when required, adjacent to any symbol. If used, abbreviations should be from ANSI/ASME Y1.1. Letter combinations used as parts of graphic symbols are not abbreviations.

Section 5. Fundamental Items

5.1 Resistor.

5.1.1 Resistor, General.

IEC

or

IEC

5.1.2 Tapped Resistor.

IEC

or

IEC

5.1.3 Variable Resistor: with Adjustable Contact.

IEC

or

IEC


3

5.1.4 Potentiometer.

IEC

or

IEC

5.1.5 Potentiometer, Preset.

IEC

or

IEC

5.1.6 Varistor (Voltage Dependent Resistor).

IEC

or

IEC

NOTE: V may be replaced by U.

5.1.7 Heater.

IEC

5.1.7.1 Application: Heater, Three Phase, Delta Connected.

IEC

5.2 Thermistor.

5.2.1 General.

IEC

5.2.1.1 Linear.

IEC

5.2.1.2 Non-Linear.

IEC

5.2.1.3 Positive Temp Coefficient.

IEC

5.2.1.4 Negative Temp Coefficient.

IEC

5.2.2 With Independent Integral Heater.

IEC

5.3 Capacitor.

5.3.1 General. If it is necessary to identify the capacitor electrodes, the curved element shall represent the outside electrode.

IEC

or

IEC

5.3.2 Polarized Capacitor.

IEC

5.3.3 Variable Capacitor.

IEC


4

5.3.4 Feed Through Capacitor.

IEC

5.4 Battery. The long line is always positive.

IEC

5.4.1 Multicell. Symbol 5.4 may also be used to indicate a battery if there is no risk of confusion: otherwise, the voltage or the number and kind of cells should be indicated.

IEC

or

IEC

5.5 Sensing Link; Fusible Link, Ambient Temperature Operated.

IEC

5.6 Thermocouple (Dissimilar-Metals Device).

5.6.1 Temperature-Measuring Thermocouple.

IEC

5.7 Inductor.

5.7.1 Inductor Coil.

IEC

5.7.2 Inductor With Magnetic Core.

IEC

5.7.3 Ferrite Bead, Shown on a Conductor.

IEC

Section 6. Conductors, Connections and Connectors, and Connecting Devices

6.1 Conductor.

IEC

6.1.1 Shielded Single Conductor.

IEC

6.1.2 Conductors in a Cable Three-Conductor Shown.

IEC

6.1.3 Twisted Conductors, Two Conductors Shown.

IEC

or

IEC

6.1.4 Ribbon Cable.

IEC

n is not part of the symbol. It is the number of conductors that shall be indicated.

6.1.5 Application: Shielded Twisted Conductor Cable with Shield Grounded (Two-Conductor Shown).

IEC

6.2 Connections.

6.2.1 Junction (Connection).

IEC


5

6.2.1.1 Application: Junction of Connected Paths, Conductors, or Wires.

IEC

or

IEC

6.2.2 Terminal.

IEC

6.2.3 Terminal Block.

IEC

6.3 Earth and Frame Connections.

6.3.1 Earth Ground. A direct conducting connection to the earth or body of water that is a part thereof.

IEC

6.3.2 Chassis Ground. A conducting connection.

IEC

6.3.3 Equipotentiality.

IEC

6.3.4 Protective Ground. This symbol may be used in place of 6.3.1, to indicate an earth connection having a specified protective function, for example, protection against electrical shock in case of a fault.

IEC

6.3.5 Noiseless Ground.

IEC

6.4 Connectors and Disconnecting Devices. The connection symbol is not an arrowhead. It is larger and the lines are drawn at a 90 ° angle.

6.4.1 Socket (Female).

IEC

or

IEC

6.4.2 Plug (Male).

IEC

or

IEC

6.4.3 Application: Plug and Socket.

IEC

6.4.3.1 Application: Multiple Plug and

Socket Shown with five Poles, Multi-Line Representation.

IEC

6.4.4 Connector Assembly, Fixed Portion.

IEC

Note: The symbol should be used only when it is desired to

distinguish between the fixed and free parts of the connection assembly.

6.4.5 Connector Assembly, Movable Portion.

IEC


6

6.4.6 Application: Mated Connector Assembly. Example Shown with Plug Side Fixed and Socket Side Moveable.

IEC

6.4.6.1 Application: Mated Connector Assembly. Example Shown with Both Sides of Connector Moveable with Three Pins and Two Sockets in One Connector and Three Sockets and Two Pins in the Mating Connector.

IEC

6.4.7 Coaxial Plug and Socket.

IEC

6.5 Connecting Link.

6.5.1 Connecting Link, Closed.

IEC

6.5.2 Connecting Link, Open.

IEC

Section 7. Contacts, Switches, Contactors, Relays, Solenoids, and Switch Operating Devices 7.1 Switch Operating Devices. The following are qualifying symbols.

7.1.1 Manually Operated Control, General Case.

IEC

7.1.2 Operated by Pulling.

IEC

7.1.3 Operated by Turning.

IEC

7.1.4 Operated by Pushing.

IEC

7.1.5 Emergency Switch (Mushroom-Head Safety Feature).

IEC

7.1.6 Operated by Lever.

IEC

7.1.7 Operated by Key.

IEC


7

7.1.8 Operated by Roller.

IEC

7.1.9 Operated by Cam.

IEC

7.1.10 Operated by Electric Motor.

IEC

7.1.11 Operated by Electric Clock.

IEC

7.2 Basic Contact and Switch Assemblies. Symbols for contacts and mechanical connections may be used for switch symbols. For switches that may be in any of two or more positions with no operating force applied, a clarifying note may be necessary to explain the point at which the switch functions. The standard method of illustrating a contact is by a symbol indicating the circuit condition it produces when the actuating device is in the de-energized or non-operated position. The actuating device may be of a mechanical, electrical, or other nature, and a clarifying note may be necessary with the symbol to explain the proper point at which the contact functions; for example, the point where a contact closes or opens as a function of a changing quantity, e.g., pressure, level, flow, voltage, current. In cases where it is desirable to illustrate contacts in the energized or operated condition and where confusion may result, a clarifying note shall be added to the drawing.

7.2.1 Normally Closed Contact (Break).

or

IEC

7.2.2 Normally Open Contact (Make).

or

IEC

7.2.3 Change-Over Break Before Make Contact.

IEC

7.2.4 Two-Way Contact with Center Off Position.

IEC

7.2.5 Change-Over Make Before Break Contact.

IEC

7.2.6 Normally Open Contact with Time-Delay Closing (NOTC). (Make Contact Delayed when Closing.)

or

IEC

7.2.7 Normally Closed Contact with Time-Delay Opening (NCTO). (Break Contact Delayed when Opening)

or

IEC

7.2.8 Normally Open Contact with Time-Delay Opening (NOTO).(Make Contact Delayed when Reopening.)

or

IEC


8

7.2.9 Normally Closed Contact with Time-Delay Closing (NCTC). (Break Contact Delayed when Reclosing)

or

IEC

7.3 Operating Device (General Symbol).

or

IEC

7.3.1 Relay Coil of an Alternating Current Relay.

IEC

7.3.2 Relay Coil of a Direct Current Relay. Relays that are direct current operated are not marked to indicate DC operation. Use the general symbol of 6.3 above.

7.3.3 Relay Coil of a Slow-Releasing Relay.

IEC

7.3.4 Relay Coil of a Slow-Operating Relay.

IEC

7.3.5 Relay Coil of a Slow-Operating and Slow-Releasing Relay.

IEC

7.3.6 Actuating Device of a Thermal Relay.

IEC

7.3.7 Relay Coil of a Slow Releasing Alternating Current Relay.

IEC

7.4 Electromagnetic Actuator (Solenoid) with Mechanical Linkage Shown.

IEC

7.5 Manually Operated Switch.

7.5.1 Maintained.

7.5.1.1 Switch, Single Throw.

or

7.5.1.1.1 Application: Three-Pole Disconnect Switch. Lever Operated Isolating (Not to be Opened Under Load)

IEC

7.5.1.1.2 Application Three-Pole Disconnect Switch. Lever Operated (May be Opened Under Load)

IEC

or


9

7.5.1.2 Switch, Double Throw.

or

IEC

7.5.1.3 Switch, 3 Position with Center Off.

or

IEC

7.5.1.4 Two Circuit, Maintained or Not Spring-Return.

or

IEC

7.5.2 Pushbutton, Momentary or Spring-Return.

7.5.2.1 Normally Open, Circuit Closing (Make).

or

IEC

7.5.2.2 Normally Closed, Circuit Opening (Break).

or

IEC

7.5.2.3 Two Circuit (Dual).

or

IEC

7.5.3 Examples of Multi-Pole and Multi-Position Switches.

7.5.3.1 Single-Pole N-Position Switch. Show for n = 6.

IEC

7.5.3.2 Single-Pole n-Position Switch. Alternatives for Use when n is small. Shown for n = 4.

IEC

or

IEC

7.5.3.3 Four-Position Switch. Manually Operated, Having Four Independent Circuits.

IEC


10

7.5.3.4 Single-Pole, Four-Position Switch in which Position 2 Cannot be Connected.

IEC

7.5.3.5 Single-Pole, Six-Position Switch with a Wiper that Bridges only while Passing from one Position to the Next.

IEC

7.5.3.6 Single-Pole, Multi-Position Switch with a Wiper that Bridges Three Consecutive Terminals in Each Switch Position.

IEC

7.5.3.7 Single-Pole, Multi-Position Switch with a Wiper that Bridges Four Terminals but One Intermediate Terminal in Each Switch Position.

IEC

7.6 Limit Switch, Directly Actuated, Spring Returned.

7.6.1 Limit Switch Normally Open.

or

IEC

7.6.2 Limit Switch Normally Closed.

or

IEC

7.7 Flow Actuated Switch.

7.7.1 Closes on Increase in Flow.

or

IEC

7.7.2 Opens on Increase in Flow.

or

IEC

7.8 Liquid-Level-Actuated Switch.

7.8.1 Closes on Rising Level.

or

IEC

7.8.2 Opens on Rising Level.

or

IEC


11

7.9 Pressure- or Vacuum-Actuated Switch. 7.9.1 Closes on Rising Pressure.

or

IEC

7.9.2 Opens on Rising Pressure.

or

IEC

7.9.3 Closes on Rising Differential Pressure.

or

IEC

7.9.4 Opens on Rising Differential Pressure.

or

IEC

7.10 Temperature-Actuated Switch.

7.10.1 Closes on Rising Temperature.

or

IEC

7.10.2 Opens on Rising Temperature.

or

IEC

7.11 Humidity-Actuated Switch.

7.11.1 Closes on Rising Humidity.

or

IEC

7.11.2 Opens on Rising Humidity.

or

IEC

Section 8. Transformers 8.1 Transformer with Multiple Windings.

8.1.1 Transformer with Two Windings.

IEC


12

8.1.2 Transformer with Two Windings, Shown with Instantaneous Voltage Polarity Indicators.

IEC

8.1.3 Transformer with Three Windings.

IEC

8.1.4 Transformer with Center Tap on One Winding.

IEC

8.1.5 Transformer with Variable Coupling.

IEC

8.2 Auto-Transformer.

8.2.1 Auto-Transformer.

IEC

8.2.2 Adjustable Auto-Transformer.

IEC

8.3 Current Transformer.

IEC

Section 9. Semiconductor Devices 9.1 Two Terminal Devices.

9.1.1 Semiconductor Diode, Semiconductor Rectifier Diode.

or

IEC

9.1.2 Unidirectional Diode, Voltage Regulator, Zener Diode.

or

IEC

9.1.3 Breakdown Diode, Bi-Directional.

or

IEC

9.1.4 Photodiode.

or

IEC

9.1.5 Light Emitting Diode.

or

IEC

9.1.6 Diode, Temperature Dependent.

IEC


13

9.1.7 Bi-directional Diode, Diac.

IEC

9.2 Three (or More) Terminal Devices.

9.2.1 Thyristor, Type Unspecified.

IEC

9.2.2 Thyristor, Reverse Blocking Triode-Type, N-Type Gate, Semiconductor Controlled Rectifier, N-Type Gate.

or

IEC

9.2.3 Thyristor, Reverse Blocking Triode-Type, P-Type Gate, Semiconductor Controlled Rectifier, P-Type Gate.

or

IEC

9.2.4 Thyristor, Reverse Blocking Tetrode-Type, Semiconductor Controlled Switch.

or

IEC

9.2.5 Thyristor, Bi-directional Triode-Type, Triac, Gated Switch.

or

IEC

9.2.6 PNP Transistor.

IEC

9.2.7 NPN Transistor.

IEC

9.2.8 NPN Transistor with Collector Connected to the Envelope.

IEC

9.2.9 Optical Coupling Device: Opto Isolator Shown with Light Emitting Diode and Phototransistor.

IEC

Section 10. Circuit Protectors 10.1 Fuse.

IEC

or

or


14

10.2 Circuit Operators.

10.2.1 Thermal Operator.

or

or

IEC

10.2.2 Magnetic Operator.

or

IEC

10.3 Circuit Breaker.

10.3.1 General.

IEC

or

10.3.1.1 Single-Pole Circuit Breaker with Thermal Overload.

IEC

or

or

10.3.1.2 Single-Pole Circuit Breaker with Magnetic Overload.

or

IEC

10.3.2 Three-Pole Circuit Breaker with Thermal Overload Device in All 3 Poles.

or

or

IEC

10.3.3 Three-Pole Circuit Breaker with Magnetic Overload Device in All 3 Poles.

or


15

IEC

10.3.4 Three-Pole Circuit Breaker with Thermal and Magnetic Overload Devices in All 3 Poles.

or

IEC

10.4 Gaps and Arrestors.

10.4.1 Gap.

or

IEC

10.4.2 Double Spark Gap.

IEC

10.4.3 Protective Gas Discharge Tube.

IEC

Section 11. Motor Starters 11.1 General.

IEC

11.1.1 Application. Motor Starter with Three Thermal Current Elements and a Setting Range From 5 to 6 Amperes.

IEC

11.1.2 Application. Motor Starter with Three Magnetic Current Elements and a Setting Range from 5 to 7 amperes.

IEC

11.1.3 Application. Motor starter With Three Thermal Magnetic Current Elements and a Setting Range from 2 to 5 amperes.

IEC

11.2 Star-Delta (Wye-Delta) Starter.

IEC

11.3 Auto-Transfer Starter.

IEC

11.4 Primary Reactor Starter.

IEC


16

11.5 Starter Regulator With Thyristors.

IEC

Section 12. Lamps and Signaling Devices 12.1 Lamp, General Symbol.

IEC

Notes: If it is desired to indicate color, a notation according to the following code is placed adjacent to the symbol.

Color IEC ANSI Y1.1

Red RD RED

Yellow YE YEL

Green GN GRN

Blue BU BLU

White WH WHT

Amber AM AMB

Orange OR ORN

Purple PR PRP

Clear CLR

If it is desired to indicate the type of lamp, a notation according to the following code is placed adjacent to the symbol: Ne = neon Xe = xenon Na = sodium vapor Hg = mercury I = iodine IN = incandescent EL = electroluminescent ARC = arc FL = fluorescent IR = infra-red UV = ultra-violet LED = light emitting diode

12.1.1 Application, Red Neon Lamp.

IEC*

12.1.2 Signal Lamp, Flashing Type.

IEC

12.2 Signaling Devices.

12.2.1 Horn.

IEC

12.2.2 Bell.

IEC

or

IEC

12.2.3 Single-Stroke Bell.�

IEC

12.2.4 Siren.

IEC

12.2.5 Buzzer.

IEC

or

IEC

12.2.6 Whistle, Electrically Operated.

IEC


17

Section 13. Instruments

13.1 Indicating Instruments.

IEC

The asterisk within the symbols of this section shall be replaced with one of the following:

V = Voltmeter A = Ammeter W = Wattmeter Hz = Frequency Meter = Oscilloscope to = Temperature � = Tachometer

13.2 Recording Instruments.

IEC


to = Temperature % H2O = Humidity V = Voltmeter A = Ammeter

13.3 Integrating Instruments.

IEC


h = Hour Meter Wh = Watt-hour Meter

13.4 Pulse Meter (Electrically-Operated Counting Device).

IEC

Section 14. Rotating Machinery 14.1 Rotating Machine.

14.1.1 Motor, General

IEC

14.1.2 Generator, General.

IEC

14.1.3 Stepping Motor, General.

IEC

14.1.4 D.C. Two-Wire Series Motor.

IEC

14.1.5 D.C. Two-Wire Shunt Motor.

IEC

14.1.6 D.C. Two-Wire Generator, Compound Excited, Short Shunt, Shown with Terminals and Brushes.

IEC

14.1.7 Induction Motor, Single-Phase (General).

IEC

14.1.7.1 Induction Motor, Single Phase, Squirrel Cage, Leads of Split Phase Brought Out.

IEC


18

14.1.7.2 Induction Motor, Single-Phase, with One Lead of Split Phase Connected Internally.

IEC

or

IEC

14.1.7.3 Induction Motor, Single-Phase, with One Phase Connected Internally and Internal Thermal Protection.

or

14.1.8 Induction Motor, Three-Phase, Squirrel Cage (General).

IEC

14.1.8.1 Induction Motor, Three-Phase, Wye Connected.

IEC

14.1.8.2 Induction Motor, Three-Phase, Delta Connected.

IEC

14.1.8.3 Induction Motor, Three Phase with Both Leads of Each Phase Winding Brought Out.

IEC

14.1.8.4 Induction Motor, Three Phase with Two Delta Connected Windings.

IEC

14.1.8.5 Induction Motor, Three Phase, Dual Voltage.

14.1.8.6 Induction Motor, Three-Phase with Internal Thermal Overload Protection.

14.1.9 Induction Motor, Reversible, Squirrel Cage with Two Phase Winding, Four Wire.


19

Section 15. Conformance Conditions 15.1 Conformance. While conformance with this standard is voluntary, symbols represented as being in accordance with this standard shall conform with all the provisions thereof.


20

APPENDIX A. REFERENCES – NORMATIVE A1 Listed here are all standards, handbooks, and other publications essential to the formation and implementation of the standard. All references in this appendix are considered as part of this standard.

A1.1 ANSI/ASME Standard Y1.1-1989, Abbreviations for Use on Drawings and in Text, 1989, American National Standards Institute/American Society of Mechanical Engineers25 West 43rd Street, 4th Floor, New York, NY 10036, U.S.A /345 East 47th Street, New York, NY 10017, U.S.A

A1.2 ANSI/IEEE Standard 280-1985 (R1997), Letter Symbols for Quantities Used in Electrical Science and Engineering, 1997, 25 West 43rd Street, 4th Floor, New York, NY 10036, U.S.A/345 East 47th Street, New York, NY 10017, U.S.A A1.3 ANSI/IEEE Standard 200-1975 (R1988), Reference Designations for Electrical and Electronic, 1988, 25 West 43rd Street, 4th Floor, New York, NY 10036, U.S.A/345 East 47th Street, New York, NY 10017, U.S.A

A1.4 ANSI/IEEE Standard 315-1975 (R1994), Graphic Symbols for Electrical and Electronics Diagrams (Including Reference Designation Class

Designation Letters), 1994, 25 West 43rd Street, 4th Floor, New York, NY 10036, U.S.A/345 East 47th Street, New York, NY 10017, U.S.A A1.5 ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration, Second Edition, 1991, American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. A1.6 IEC Standard Publication 60027-1, Letter Symbols to be Used in Electrical Technology - Part1, 1992, International Electrotechnical Commission, 3, rue de Varembe, P.O. Box 131, 1211 Geneva 20, Switzerland. A1.7 IEC Standard Publication 60617-1, Graphical Symbols for Diagrams, 1985, International Electrotechnical Commission, 3, rue de Varembe, P.O. Box 131, 1211 Geneva 20, Switzerland.

A1.8 AHRI Standard 110-2002 (formerly ARI Standard 110-2002), Air-Conditioning and Refrigerating Equipment Nameplate Voltages, 2002, Air-Conditioning, Heating, and Refrigeration Institute, 2111 Wilson Boulevard, Suite 500, , Arlington, VA 22201, U.S.A.

APPENDIX B. REFERENCES – INFORMATIVE

None.

ari symbols

Documents