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The Essentials Of Working With R-410A
The trend towards the use of refrigerant 410A continues to grow and there is a demand for technicians who are comfortable working with this higher-pressure replacement for R-22.
By Norm Christopherson
For The News
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Activated Carbon For HVAC Applications
To totally "clean" indoor air, gases and vapors must be removed. For HVAC applications, activated carbon is commonly used. Why and how it is applied are detailed.
By James W. Kasmark Jr.
For The News
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Btu Buddy 6: Removing Water From A Wet Heat Pump System
In this edition of the Btu Buddy series, Bob is helping finish a job that a new construction crew installed. The installers left the gas line and liquid line on a heat pump turned up all weekend and it rained in the tubing. Bob must dry out the system.
By Bill Johnson
For The News
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The Importance Of Filter-Driers
Filter-driers play a pivotal role in the operation of air conditioning and refrigeration systems. As important as the filter-drier is, many actually do not understand how it works. Here are some details.
By Norm Christopherson
For The News
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Btu Buddy 5: A Conversation About Vacuum Procedures
In this installment of the series, Bob stops at a diner for lunch and has something on his mind. He has been to school where all of the terms of pressure and vacuum have been discussed, but he does not have a firm grasp on the terms. He wants to better understand the evacuation of a system.
By Bill Johnson
For The News
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General Service Safety Precautions
HVACR service personnel always need to think safety first when working on equipment. The information in this article is intended to provide an overview to assist in the safe service and maintenance of systems.
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Btu Buddy 4: Cleaning A Very Dirty Condenser
In this fourth installment of the Btu Buddy series, Bob catches a service call and goes through the procedure for properly cleaning a dirty condenser.
By Bill Johnson
For The News
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Start-Up And Winterizing Of Evaporative Cooling Equipment
These tips apply to cooling towers, closed circuit coolers, evaporative condensers, and closed circuit industrial coolers. Proper winterizing, spring start-up procedures, and scheduled periodic maintenance will prolong the life of the equipment, and help ensure trouble-free performance.
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Rooftop Systems: Tips For Maintaining Peak Performance
Rooftop units require regular visual inspection, filter changes, lubrication, and other service and maintenance regimen to keep performing efficiently. These tips will help you maintain large rooftop equipment (15 ton and above) for peak performance while actually reducing maintenance hours.
By Paul Hollingsworth
For The News
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Btu Buddy 3: Charging A System With A Fixed Bore Orifice
In this installment of the Btu Buddy series, Bob gets a service call from the dispatcher who says a residence with a very sick lady is getting very hot. Bob needs to cool off a hot compressor and get the A/C system working quickly.
By Bill Johnson
For The News
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Applying The Predictive Approach To Maintenance
By helping your customers apply the predictive approach to maintenance, downtime can be avoided and costs can be reduced. The advantage to the service contractor is that maintenance work can be planned and performed on a regular schedule.
By Michael V. Brown
For The News
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Btu Buddy 2: Charging A System After Loss Of Charge
In this second installment of the Btu Buddy series, Bob and Btu Buddy perform an emergency service call. They determine the most efficient way to repair and charge an air conditioning system for an office building.
By Bill Johnson
For The News
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Factors That Make A Successful Maintenance Organization
Most of us believe that technical expertise is the most important factor in building a successful maintenance organization. However, we all know excellent technicians that fail in the service business. Why do they fail, or why do they fail to grow?
By R.J. Morris, P.E.
For The News
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Btu Buddy 1: Servicing A Frozen Suction Line And Compressor
Bob has a buddy in the business. He recalls his long-time HVACR mentor and imagines him accompanying him as “Btu Buddy,” someone who reminds him to take time to stop and think before rushing to judgment, helping keep him on the right track.
By Bill Johnson
For The News
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Proper Use Of Superheat Measurements
With increasing energy costs and demand for more efficient cooling systems, the need for accurate superheat measurements has become more important. Unfortunately, some technicians have either forgotten what they were taught about superheat in school or think it’s too much trouble to perform.
By Adolfo Wurts
For The News
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Twelve Solutions For Fixing Common TEV Problems
Most refrigeration equipment breakdowns are repeat problems to some degree. The purpose of this article is to cover the higher percentage problems and repair procedures of TEVs in supermarket applications.
By Steve Esslinger
For The News
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Screw Compressor Teardown: A Few Basics – Part 2
This article is the second installment of a two-part series. Part One provided some background on screw compressors, then discussed the various components and capacity control methods. Part Two discusses maintenance of the screw compressor.
By Bill Yoder
For The News
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Screw Compressor Teardown: A Few Basics – Part 1
Screw compressors can be either twin helical screws or a single screw design. They can be open drive, semi-hermetic, or hermetic in configuration. In addition, there are oil-flooded compressors and non-oil (dry) compressors.
By Bill Yoder
For The News
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Time For An Oil Change?
One of the least expensive and most overlooked tests that can be provided during chiller preventive maintenance is oil testing.
By Scott Herberg
For The News
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Troubleshooting Direct Spark Ignition Systems
Flame rectification is vital knowledge for gas heat troubleshooters. This article deals with flame rectification as it applies to direct spark ignition (DSI) modules.
By Timmie McElwain
For The News
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Refrigerant Line Sets Can Cause Compressor Failures
This article is intended to give you a general overview of piping design considerations and to help you to determine when you might need to take extra measures during an installation.
By Howard Leonard
For The News
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Keeping Motors Clean
A clean motor is a happy motor. As any service technician knows from experience, contamination is one of the leading causes of premature motor failure.
By Neil Simon
For The News
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