AHRI 840-1998 Unit Ventilators.pdf

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1、 AHRI Standard 840 (formerly ARI Standard 840) 1998 Standard for Unit Ventilators AHRI Standard 840 (formerly ARI Standard 840) Price $10.00 (M) $20.00 (NM) Copyright 1998, by Air-Conditioning, Heating and Refrigeration Institute Printed in U.S.A. Registered United States Patent and Trademark Office

2、 IMPORTANT SAFETY RECOMMENDATIONS It is strongly recommended that the product be designed, constructed, assembled and installed in accordance with nationally recognized safety requirements appropriate for products covered by this standard. AHRI, as a manufacturers trade association, uses its best ef

3、forts to develop standards employing state-of-the-art and accepted industry practices. However, AHRI does not certify or guarantee safety of any products, components or systems designed, tested, rated, installed or operated in accordance with these standards or that any tests conducted under its sta

4、ndards will be non-hazardous or free from risk. Note: This is a new standard. 2 TABLE OF CONTENTS SECTION PAGE Section 1. Purpose 1 Section 2. Scope .1 Section 3. Definitions .1 Section 4. Classifications 3 Section 5. Testing and Rating Requirements 3 Section 6. Minimum Data Requirements for Publish

5、ed Ratings 6 Section 7. Operating Requirements 6 Section 8. Marking and Nameplate Data 6 Section 9. Voluntary Conformance 6 TABLES Table 1. Arrangement of Unit Ventilators .2 Table 2. Air Flow Testing Conditions .4 FIGURES Figure 1. Standard Ventilation Rate Test Set-Up .5 APPENDICES Appendix A. Ref

6、erences Normative 7 Appendix B. References Informative .7 AHRI STANDARD 840-98 1 UNIT VENTILATORS Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish, for unit ventilators: definitions; classifications; testing and rating requirements; minimum data requirements for published

7、 ratings; performance requirements; operating requirements; marking and nameplate data; and conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineers, installers, contractors, and users. 1.1.2 Review and Amendment. This stand

8、ard is subject to review and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to all factory-made equipment as defined in the following standards which also meet the requirements of 3.4 and are labeled as a unit ventilator. a. Room fan-coil air-conditioners, AHRI S

9、tandard 440 (formerly ARI Standard 440). b. Packaged terminal air-conditioners, AHRI Standard 310/380 (formerly ARI Standard 310/380). c. Unitary air-conditioners and heat pump units, AHRI Standard 210/240 (formerly ARI Standard 210/240). d. Water-source heat pumps, AHRI Standard 320 (formerly ARI S

10、tandard 320). e. Ground water-source heat pumps, AHRI Standard 325 (formerly ARI Standard 325). f. Ground source closed-loop heat pumps, AHRI Standard 330 (formerly ARI Standard 330). 2.2 Exclusions. This standard does not apply to equipment as defined in the following standards: a. Room air-conditi

11、oners, AHAM Standard RAC-1 or ANSI Standard Z234.1. b. Central-station air-handling units, AHRI Standard 430 (formerly ARI Standard 430). Section 3. Definitions 3.1 Definitions. All terms in this document will follow the standard industry definitions established in the current edition of ASHRAE Term

12、inology of Heating, Ventilation, Air Conditioning and Refrigeration, unless otherwise defined in this section. 3.2 Published Rating. A statement of the assigned values of those performance characteristics, under stated rating conditions, by which a unit may be chosen to fit its application. These va

13、lues apply to all units of like nominal size and type (identification) produced by the same manufacturer. As used herein, the term “published rating“ includes the rating of all performance characteristics shown on the unit or published in specifications, advertising or other literature controlled by

14、 the manufacturer, at stated rating conditions. 3.2.1 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.2.2 Application Rating. A rating based on tests performed at application rating conditions (other than Standard Rating Conditions). 3.3 “Shall,“ “Should,“ “ Recom

15、mended“ or “It Is Recommended.“ “Shall,“ “should,“ “recommended“ or “it is recommended“ shall be interpreted as follows: 3.3.1 Shall. Where “shall“ or “shall not“ is used for a provision specified, that provision is mandatory if compliance with the standard is claimed. AHRI STANDARD 840-98 2 I.D. Fa

16、n I.D. Coils O.D. Fan Comp* O.D. Coil I.D. Fan I.D. Coils O.D. Fan Comp* O.D. Coil I.D. Fan I.D. Coil(s) Comp Water/ Refrigerant Coil I.D. Fan I.D. Coil(s) O.D. Fan Comp O.D. Coil I.D. Fan I.D. Coil(s) 3.3.2 Should, Recommended or It Is Recommended. “Should,“ “recommended“ or “it is recommended“ is

17、used to indicate provisions which are not mandatory but which are desirable as good practice. 3.4 Unit Ventilator. A factory-made assembly, equipped with outside air ventilation and return air dampers capable of introducing ventilation air of at least 80% of rated Standard Air Flow, while also havin

18、g the capability to provide any combination of the following functions: humidity control, heating or cooling, and filtering of air. The source of humidity control, heating or cooling supplementary to that from ventilation air, may be remote or an integral part of the unit itself. This equipment is d

19、esigned for free delivery of air into a room, but may be applied with minimal ductwork having a static resistance not exceeding 0.50 in. H2O 125 Pa. This equipment can be either vertical floor standing or horizontally mounted, in or adjacent to the space it serves. This equipment is provided with ai

20、r capacities of 3000 cfm 1416 m3/s or less. Table 1. Arrangement of Unit Ventilators Description Cooling/Heating AHRI Standard Arrangement Self-Contained Unit Ventilator Vapor Compression/Vapor Compression & (backup heat) (electric) (hydronic) (steam) 310/380 Vapor Compression/electric Vapor Compres

21、sion/hydronic Vapor Compression/steam Vapor Compression/none 310/380 Water-Source Self Contained Unit Ventilator Vapor Compression/Vapor Compression & (backup heat) (electric) 320, 325 and 330 Fan-Coil Unit Ventilator Vapor Compression/electric Vapor Compression/hydronic Vapor Compression/steam Vapo

22、r Compression/none 210/240 Vapor Compression/Vapor Compression & (backup heat) (electric) (hydronic) (steam) 210/240 hydronic/electric hydronic/hydronic hydronic/steam hydronic/none 440 * Compressor may be indoors or outdoors. 3.4.1 Self-Contained Unit Ventilators. Any equipment as defined in AHRI S

23、tandard 310/380 (formerly ARI Standard 310/380) with ventilation capabilities as defined in 3.4. 3.4.2 Water-Source Self-Contained Unit Ventilators. Any equipment as defined in AHRI Standards 320, 325, or 330 (formerly ARI Standards 320, 325, or 330) with ventilation capabilities as defined in 3.4.

24、AHRI STANDARD 840-98 3 3.4.3 Fan-Coil Unit Ventilators. Any equipment as defined in AHRI Standards 440 or 210/240 (formerly ARI Standards 440 or 210/240) with ventilation capabilities as defined in 3.4. Section 4. Classifications 4.1 Methods of Classification. Unit ventilators may be classified acco

25、rding to the following (see arrangements in Table 1): 4.1.1 By mounting arrangement a. Vertical, floor or wall mounted b. Horizontal, ceiling mounted 4.1.2 By methods of capacity control a. Damper Control b. Non-Damper Control 4.1.3 By method of providing heating a. Hydronic b. Steam c. Electric ele

26、ments d. Heat pump 4.1.4 By method of providing mechanical cooling 4.1.4.1 Hydronic 4.1.4.2 Direct Expansion a. Single package b. Split system 4.1.5 By humidity control a. Dehumidification b. Humidification Section 5. Testing and Rating Requirements 5.1 Standard Ratings. 5.1.1 Standard Performance R

27、atings. All applicable cooling capacity, heating capacity, power input, efficiency, standard air flow, fluid flow, and pressure drop ratings shall be verified by tests conducted at the Standard Rating Conditions, in accordance with the applicable standard(s) referenced in 3.4.1, 3.4.2, and 3.4.3. 5.

28、1.2 Standard Ventilation Rate. The Standard Ventilation Rate, expressed in percent, shall be determined in accordance with ANSI/ASHRAE Standard 79 by conducting two separate tests at the conditions specified in Table 2. References may also be made to ANSI/ASHRAE Standard 79 for a typical duct connec

29、tion arrangement. 5.2 Electrical Conditions. All Standard Rating tests shall be performed at the nameplate rated voltage and frequency. For units with dual nameplate voltage ratings, standard rating tests shall be performed at both voltages, or at the lower of the two voltages, if only a single stan

30、dard rating is to be published. AHRI STANDARD 840-98 4 Table 2. Air Flow Testing Conditions Room Air Test Ventilation Air Test Inlet Air Temperature 70F 21.1C to 80F 26.7C dry bulb 70F 21.1C to 80F 26.7C dry bulb Heating or Cooling Means Not in Operation Not in Operation Static Pressure difference b

31、etween room air inlet and outlet 0.0 in. H2O 0.0 kPa Free Discharge Static Pressure at ventilation air inlet - -0.05 in. H2O -0.012 kPa Fan Speed Setting Same as for Standard Cooling Rating Condition Same as for Standard Cooling Rating Condition Inside /Outside Damper Position Adjusted for full Room

32、 Air (no ventilation air) Adjusted for full Ventilation Air (no room air) Face/Bypass Damper Position (if equipped) Adjusted for Full Face, 0% Bypass Adjusted for Full Face, 0% Bypass ANSI/ASHRAE Standard 41.2 Test Arrangements See Figure 14 of ANSI/ASHRAE Standard 41.2 See Figure 13 of ANSI/ASHRAE

33、Standard 41.2 5.3 Equipment. Filters, any air-mixers, air-inlets, grilles, deflecting vanes, and any other regularly-furnished equipment shall be in place during all following tests. 5.4 Testing Requirements. All ratings shall be verified by tests conducted in accordance with ANSI/ASHRAE Standard 79

34、. 5.4.1 Room Air Test. The Room Air Test shall be conducted with the ventilation air inlet opening sealed so that no air flow enters the unit except from the room side. The flow rate shall be the value measured from flow meter 1 as depicted in Figure 1. 5.4.2 Ventilation Air Test. The Ventilation Ai

35、r Test shall be conducted with air flow measuring apparatus connected to the ventilation air opening. The flow rate shall be the value measured from flow meter 2 as depicted in Figure 1. Flow meter 1 and any associated duct work shall be removed for this test. Units shall be tested without any outsi

36、de air intakes, louvers, wall boxes, etc. in place. The unit shall be tested with an external static of -0.05 in. of H2O -0.012 kPa measured at the ventilation air inlet to simulate the pressure drop of a typical device. 5.4.3 The Standard Ventilation Rate shall be the ratio of air flow measured in

37、accordance with 5.4.2 over the air flow measured in accordance with 5.4.1 expressed as a percent. 5.5 Application Ratings. Ratings at conditions other than the Standard Rating Conditions may be published as application ratings, and shall be based on data determined by the methods of testing prescrib

38、ed in the applicable Standards references in 3.4.1, 3.4.2 and 3.4.3. Wherever application ratings are published or printed, they shall include, or be accompanied by, the Standard Rating, clearly designated as such, including a statement of the conditions at which the ratings apply. 5.6 Tolerances. T

39、o comply with this standard, published or reported cooling capacity, heating capacity, power input, efficiency, standard air flow, fluid flow and pressure drop shall be based on data obtained in accordance with the provisions of this section, and shall be such that any production unit selected at ra

40、ndom and tested in accordance with the standard shall achieve 100% of rated or published value, less the allowable tolerance specified in the applicable standard(s) referenced in 3.4.1, 3.4.2, and 3.4.3. The tested Standard Ventilation Rate shall be no less than 95% of the rated value and no less th

41、an 80% of the airflow measured in 5.4.3. AHRI STANDARD 840-98 5 Figure 1. Standard Ventilation Rate Test Set-Up AHRI STANDARD 840-98 6 Section 6. Minimum Data Requirements for Published Ratings 6.1 Published Ratings. Wherever application ratings are published or printed, they shall include or be acc

42、omplished by the Standard Rating clearly designated as such, including a statement of the conditions at which the ratings apply. 6.2 Content of Published Ratings. Published ratings shall consist of the Standard Ventilation Rate, expressed in percent, and any other information as required by all appl

43、icable standard(s) referenced in Sections 3.4.1, 3.4.2 and 3.4.3. Section 7. Operating Requirements 7.1 Performance Requirements. To comply with this standard, unit ventilators shall be designed and produced so as to perform in accordance with the provisions of this section, in such a manner that an

44、y production unit will meet the requirements detailed herein. 7.1.1 Self-Contained Unit Ventilators. All performance tests for self-contained unit ventilators shall be tested in accordance with the provisions of AHRI Standard 310/380 (formerly ARI Standard 310/380). 7.1.2 Water-Source Self-Contained

45、 Unit Ventilators. All performance tests for water-source self-contained unit ventilators shall be tested in accordance with the provisions of AHRI Standards 320, 325 and 330 (formerly ARI Standards 320, 325 and 330). 7.1.3 Fan-Coil Unit Ventilators. All performance tests for fan-coil unit ventilato

46、rs shall be tested in accordance with the provisions of AHRI Standards 440 and 210/240 (formerly ARI Standards 440 and 210/240). Section 8. Marking and Nameplate Data 8.1 Marking and Nameplate Data. The unit nameplate shall display, as a minimum: a. The name of the manufacturer and/or the supplier r

47、esponsible for the performance ratings. b. The model number of the equipment. 8.2 Recommended nameplate voltages for 60 Hertz systems shall include one or more of the equipment nameplate voltage ratings shown in Table 1 of AHRI Standard 110 (formerly ARI Standard 110). Recommended nameplate voltages

48、 for 50 Hertz systems shall include one or more of the utilization voltages shown in Table 1 of IEC Standard Publication 38. Section 9. Voluntary Conformance 9.1 Conformance. While conformance with this standard is voluntary, conformance shall not be claimed or implied for products or equipment with

49、in its Purpose (Section 1) or Scope (Section 2) unless such claims meet all of the requirements of the standard. AHRI STANDARD 840-98 7 APPENDIX A. REFERENCES NORMATIVE A1 Listed here are all standards, handbooks and other publications essential to the formation and implementation of the standards. All references in this appendix are considered as part of the standard. A1.1 ANSI/ASHRAE 41.2-1987, Standard Methods for Laboratory Airflow Measurement, 1987, American National Standards Institute/American Society of Heating, Refrigeration, and Air-Conditioning Eng