欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    AHRI GUIDELINE X-2009 Induced Draft Furnace Heat Exchanger Inspection.pdf

    • 资源ID:422625       资源大小:88.34KB        全文页数:8页
    • 资源格式: PDF        下载积分:5000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要5000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    AHRI GUIDELINE X-2009 Induced Draft Furnace Heat Exchanger Inspection.pdf

    1、 AHRI Guideline X2009 Guideline for Induced Draft Furnace Heat Exchanger Inspection Price $5.00 (M) $10.00 (NM) Copyright 2009, 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 c

    2、ertify 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 recogniz

    3、ed 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 standard

    4、s/guidelines will be non-hazardous or free from risk. FOREWORD Gas Furnaces are known for their safety, performance and longevity. This is largely due to their certification to nationally recognized safety standards and the building standards and codes that require equipment be installed according t

    5、o the manufacturers installation instructions. AHRI recognizes that despite the excellent safety record of gas furnaces, there have been infrequent reports of gas furnace heat exchanger problems. To address these situations, an industry-accepted procedure known as the “Three-Step Method for Detectin

    6、g Unacceptable Flue Gas Leakage from Furnace Heat Exchangers” has been used since the early 1980s to conduct field inspections of gas-fired furnace Heat Exchangers. Though this procedure has been effective for testing Heat Exchangers in natural draft Furnaces, its effectiveness for testing Heat Exch

    7、angers on induced draft Furnaces that maintain a significant negative pressure within the Heat Exchanger has been questioned. Though it is unlikely for an induced draft Furnace to leak flue products from the Heat Exchanger to the circulated airstream, this guideline outlines a new test procedure to

    8、enhance the existing three-step methodology to make it more applicable, reliable and repeatable for the inspection of induced draft furnace Heat Exchangers. Note: This is a new AHRI Guideline.TABLE OF CONTENTS PAGE Section 1. Purpose .1 Section 2. Scope 1 Section 3. Definitions1 Section 4. Five-Step

    9、 Method.2 APPENDICES Appendix A. References - Normative .4 Appendix B. References - Informative 4 AHRI GUIDELINE X-2009 1INDUCED DRAFT FURNACE HEAT EXCHANGER INSPECTION Section 1. Purpose 1.1 Purpose. The purpose of this guideline is to outline a test procedure for the inspection of induced draft fu

    10、rnace heat exchangers. 1.1.1 Intent. This guideline is intended for the guidance of the industry, including gas utility companies, government authorities, manufacturers, engineers, building inspectors, building code officials, installers, and contractors. 1.1.2 Review and Amendment. This guideline i

    11、s subject to review and amendment. Section 2. Scope This guideline applies to the inspection of induced draft furnace heat exchangers. Section 3. Definitions All terms in this document follow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air

    12、Conditioning, and Refrigeration unless otherwise defined in this section. 3.1 Blower. A device for moving air by two or more blades or vanes attached to a rotating shaft. 3.2 Burner. Part of a furnace where flame is produced. 3.3 Flue Gas. All gases in a flue during combustion in the combustion cham

    13、ber, including reacting products such as excess air, carbon dioxide, carbon monoxide, oxygen, water vapor, nitrogen, and other inerts. 3.4 Furnace. An enclosed chamber or structure in which heat is produced, as by burning fuel. 3.5 Heat Exchanger. A device to transfer heat between two physically sep

    14、arated fluids. 3.6 Induced Draft. Fan exhaust of hot gases from the heat absorbing equipment. 3.7 PPM. Parts per million. 3.8 Return Air. Air extracted from a space, and totally or partially returned to an air-conditioning, heating or ventilating apparatus. 3.9 Should. . “Should” is used to indicate

    15、 provisions which are not mandatory but which are desirable as good practice. 3.10 Static Pressure. Pressure exerted by a fluid at rest. 3.11 Supply Air. Air entering a space from an air-conditioning, heating, or ventilating apparatus. Section 4. Five-Step Method AHRI GUIDELINE X-209 1NOTE: To ensur

    16、e accuracy of the measurements, take the following precautions: 1. Take the Return Air measurement after and the Supply Air measurement before any fresh air, ventilation, humidification and/or dehumidification connections. 2. Take more than one reading and average the results to obtain the CO level.

    17、 2 This procedure is intended for use by qualified individuals trained and experienced in the servicing of an induced draft Furnace. All instrumentation used in the execution of this procedure must be in good working condition and calibrated appropriately. A gas analyzer capable of measuring carbon

    18、monoxide (CO) concentration with 1 ppm resolution is required for this procedure. 4.1 Look for Flame Disturbances. Start the Furnace and observe any changes in the flame pattern as the circulating air blower starts operating. Look for floating flames, flame roll out or flame distortion. These condit

    19、ions indicate a possible split seam, open crack, severe deterioration of the Heat Exchanger or gasketing material, or physical separation of the connected parts. Flame disturbance that occurs after the Blower comes on is a good indication that a Heat Exchanger problem may exist. Other air leaks in t

    20、he vicinity of the Burners may also cause flame disturbances and should be corrected. If these disturbances are significant and cannot be corrected by eliminating the air leaks near the Burners, refer to 4.5 for physical inspection of the Heat Exchanger. If no flame disturbances are observed, procee

    21、d to 4.2. 4.2 Measure CO levels in the Airstream1. After the Furnace has run for at least five minutes, measure the CO level in the return airstream near the Furnace and record the value. Then measure the CO level in the supply airstream at a location in the system where the air is well mixed. Gener

    22、ally, a location downstream of one or more bends in the ductwork is a good place to take the sample for this measurement. Record this value. a) If there is no measurable difference in the CO in the Return and Supply Air, it is likely the Furnace is not leaking CO into the air stream. If the measured

    23、 value is below 9 ppm, the Occupational Health and Safety Act (OHSA) acceptable maximum, proceed to 4.3. b) If there is no difference in the CO concentration between the Return and Supply Air, but there is CO detected in the air stream above 9 ppm, there may be another source of CO in the home such

    24、as other gas-fired appliances, an automobile operating in a garage, or a fireplace in operation. Discuss the elevated CO levels and the possible sources with the home owner. c) If the CO in the Supply Air is less than the CO in the Return Air, it is possible that there is an error in the measurement

    25、 or that the measurement is being diluted by a ventilation or fresh air intake. Repeat 4.2 with a different gas analyzer if possible. d) If the CO in the Supply Air is greater than the CO in the return air, it is possible that the Furnace is generating the CO that is leaking into the airstream. Proc

    26、eed to 4.5. 4.3 Measuring CO levels in Flue Pipe. Allow the Furnace to run for at least five minutes. Then measure the CO in the flue pipe, using a properly calibrated combustion analyzer. If the CO reading is less than 200 ppm, no further action is necessary. If the CO reading is 200 ppm or higher,

    27、 proceed to 4.4. 4.4 Verifying Proper Installation. Verify that the furnace installation complies with the manufacturers requirements and any applicable codes. Refer to the manufacturers installation instructions if available. Verify the gas orifice size, pressure switch settings, gas input rate and

    28、 manifold pressure, proper conversion for fuel type and altitude (if applicable), vent lengths, duct static pressure and the provision for adequate combustion air to the Furnace. Check the Furnace for any damaged or disconnected wires or hoses. Check for misaligned Burners. Inspect the vent system a

    29、nd combustion air pipe (if applicable) to check for holes or blockage. Make corrections as necessary and then re-check CO in a flue gas sample. If the CO is still at 200 ppm or higher in the Flue Gas, proceed to 4.5. 4.5 Visually Inspect Heat Exchanger. Disassemble the Furnace until you can visually

    30、 inspect all heat exchanger exterior surfaces. Any crack or hole that is big enough to affect combustion will be easily visible to the naked eye. Do not use water, AHRI GUIDELINE X-2009 3cameras or smoking agents to check for leaks. Furnace heat exchangers joints are not hermetically sealed, so a sm

    31、all amount of leakage is normal. If there are any abnormal splits, cracks or holes, the heat exchanger must be replaced. Note: If the inspection described in 4.5 does not show holes, cracks or separated seams, further investigation is necessary to determine the source of the CO contamination. AHRI G

    32、UIDELINE X-209 4 APPENDIX A. REFERENCES - NORMATIVE None. APPENDIX B. REFERENCES - INFORMATIVE B1 Listed here are standards, handbooks, and other publications which may provide useful information and background but are not considered essential. References in this appendix are not considered part of this guideline. B1.1 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.


    注意事项

    本文(AHRI GUIDELINE X-2009 Induced Draft Furnace Heat Exchanger Inspection.pdf)为本站会员(unhappyhay135)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开