Diagnosing Cooling Systems

Compared to the majority of the service techs in our industry, airheads have a distinct advantage when it comes to diagnosing cooling systems. The general idea that the system is "working" means it's typically only producing 60% or less of the equipment rated BTU removal capacity. You can do far better than that.

Quick Tests
The quick tests needed to make an initial diagnosis of a cooling system's performance are all included in NCI's CoolMaxx Report. By testing a system's static pressure and temperature change, you can plot fan airflow, (consider using the NCI Generic Fan Tables) and then calculate the delivered BTU of the system. Then simply divide the delivered BTU into the equipment rated BTU to rate or grade the performance of the system.

200 Over 130
Static pressure, when compared to blood pressure is an effective way to help your customers understand system defects. Like all other air properties, static pressure is invisible and can only be detected through measurement.
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Question Category: Air Flow Access Level: NCT Member Only Question: I almost never see a reference to getting CFM on a heating unit Per the tempature rise method. If a fan chart is not avaible is this not an acceptble way to get the CFM, What are the draw backs? Question Category: Technical Access Level: NCT Member Only Question: Is there a web site where I can get historical weather data for a particular city or region. Example my city of Dayton for Dec. 04 to Dec. 05. Question Category: Air Flow Access Level: NCT Member Only Question: Is there a static pressure / Fan chart for air handlers up to 5 tons? Question Category: Training Access Level: NCI Online User Question: What is the differance between the National Comfort Institute & the Comfort Institute? Question Category: Air Flow Access Level: NCT Member Only Question: I'm running into the new ECM variable speed motors and wondering how to get this type of systems fan curves and what I can do to get the maximum output from the fan? Anything special I should be doing? How do you measure the airflow against design? Ask a Question View More Questions

Air Balancing/Diagnostics Seminars
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- Washington, DC	Jun 24	101 Beginning Air Diagnostics & Balancing
- Washington, DC	Jun 25	201 Intermediate Air Balancing Training & Certification
- Washington, DC	Jun 26	301 Light Commercial Air Diagnostics & Balancing
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- Seattle, WA	Aug 20	201 Intermediate Air Balancing Training & Certification
- Seattle, WA	Aug 21	301 Light Commercial Air Diagnostics & Balancing
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- Cleveland, OH	Sep 17	201 Intermediate Air Balancing Training & Certification
- Cleveland, OH	Sep 18	301 Light Commercial Air Diagnostics & Balancing
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- San Antonio, TX	Sep 17	201 Intermediate Air Balancing Training & Certification
- San Antonio, TX	Sep 18	301 Light Commercial Air Diagnostics & Balancing
- Sacramento, CA	Sep 23	101 Beginning Air Diagnostics & Balancing
- Sacramento, CA	Sep 24	201 Intermediate Air Balancing Training & Certification
- Sacramento, CA	Sep 25	301 Light Commercial Air Diagnostics & Balancing
- Tampa, FL	Sep 23	101 Beginning Air Diagnostics & Balancing
- Tampa, FL	Sep 24	201 Intermediate Air Balancing Training & Certification
- Tampa, FL	Sep 25	301 Light Commercial Air Diagnostics & Balancing
- New Haven, CT	Sep 30	101 Beginning Air Diagnostics & Balancing
- New Haven, CT	Oct 1	201 Intermediate Air Balancing Training & Certification
- New Haven, CT	Oct 2	301 Light Commercial Air Diagnostics & Balancing
- Las Vegas, NV	Sep 30	101 Beginning Air Diagnostics & Balancing
- Las Vegas, NV	Oct 1	201 Intermediate Air Balancing Training & Certification
- Las Vegas, NV	Oct 2	301 Light Commercial Air Diagnostics & Balancing
- Cleveland, OH	Sept 30 - Oct 3	PerforMaxx™ University
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- Detroit, MI	Aug 5	102 The Complete Carbon Monoxide Story
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- Detroit, MI	Aug 7	302 Carbon Monoxide Review & Certification Test
- Raleigh, NC	Aug 19	102 The Complete Carbon Monoxide Story
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- Minneapolis, MN	Aug 26	102 The Complete Carbon Monoxide Story
- Minneapolis, MN	Aug 27	202 Carbon Monoxide & Combustion Solutions
- Minneapolis, MN	Aug 28	302 Carbon Monoxide Review & Certification Test
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