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Fabric Duct Can Help Win Projects, Increase Profit Margins
Fabric duct has been used in Europe for over 30 years, but many American contractors have yet to install their first fabric duct project. However, the number of contractors with no fabric duct experience is diminishing as it gains acceptance.
By Cary Pinkalla
For The News
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DDC Concepts And Strategies: An Introduction
Digital controls have been with us for years, yet those of us who do not regularly work with them are not always aware of their full capabilities.
By Norm Christopherson
For The News
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Preventing Leaks In A Copper Cooling Circuit
Typically, with factory coating, coils are immersed in a dip coating process prior to assembly. The problem is, even though they may be coated, the coils must ultimately be soldered into the copper cooling circuit. This results in sections of tubing being exposed to the atmosphere.
By Richard C. Griffin
For The News
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Jobsite Software Aids In Troubleshooting
Consumers are demanding fast, professional HVAC system repairs, and new technology is playing a pivotal role in meeting this need. An example is Trane's new Portable Jobsite Diagnostic Software for use on laptops and Pocket PCs.
By Glenn Taylor
For The News
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GPS Service Helps Contractor Track Hours And Costs
Global positioning system (GPS) applications are growing in use because they allow continuous tracking of mobile workers to help improve scheduling and dispatching. A California contractor is now applying a new GPS service that is helping the company locate and manage employees at minimum expense through the use of cell phones.
By Greg Mazurkiewicz
Of The News Staff
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Moisture Control And Remediation: Keys To Mold Control In Buildings
This article addresses the two major abatement procedures for mold control: Moisture removal and microbial remediation. The first deals with denying fungi the moisture needed for growth; the second is the response to cleaning and removing mold from affected buildings.
By Paul Harkins
For The News
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Understanding Solenoid Valves
Solenoid valves are highly engineered products that can be used in many diverse and unique system applications. Here is a brief overview of the components and functional varieties of solenoid valves.
By Parker Hannifin’s Engineering Staff
For The News
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Applying Ultraviolet Air Treatment Systems
Ultraviolet air treatment systems are fairly new to the HVAC industry, and there are still a lot of questions about how they work to treat the air. UV systems address the source of air quality problems by killing airborne bacteria and surface mold.
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The Basic Refrigeration Cycle
Mechanical refrigeration is accomplished by continuously circulating, evaporating, and condensing a fixed supply of refrigerant in a closed system. This article describes and illustrates the basics of the refrigeration cycle.
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Brushing Up On Fiberglass Duct Insulation
For nearly 50 years, fiberglass insulation has been used as a component of air duct systems to maintain comfort and IAQ. This article reviews insulation types, provides an installation overview, and discusses fiberglass duct insulation and IAQ.
By David L. Tomchak
For The News
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Contractor Helps Confirm VFD Savings
A Southeastern governmental organization was convinced that updating its multiple HVAC installations with variable-frequency AC drives would achieve energy savings and lower maintenance costs. Its regulations as a county, however, required proof. A local contractor provided it.
By Jeff Phillips
For The News
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Installing Geothermal In The Middle Of The Concrete Jungle
The continuous concrete and narrow quarters of the big city are no impediment to a direct-access geothermal system. Contractor Mike Sumple took on the challenge in the heart of Manhattan and provided an energy efficient system.
By Greg Mazurkiewicz
Of The News Staff
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A Primer On Energy Recovery Ventilators
This article provides the basics on energy recovery ventilators (ERVs): what they are, what they do, how they are installed, and service recommendations.
By Doug Dettlaff
For The News
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An Outline For Successful Fan Selections
This article outlines the considerations involved to properly select, apply, and control fans. Emphasis is placed upon matching the fan equipment to the requirements of the system from several different perspectives.
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Performing Residential A/C Airflow Setup
It’s a common misconception that the cooling blower speed on a residential air conditioning system should always be set to “high.” In many cases high speed for cooling will not give you the best possible performance and customer comfort.
By Scott Nelmark
For The News
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Ten Steps To Installing A High-Velocity HVAC System
To fully understand how to install a high-velocity HVAC system, one must know what it is and what it does. This article provides some background and the key steps to a successful installation.
By Floyd Lewis
For The News
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Understanding Double Seated Shut-Off Valves
For small valves up to and including 8 inches, the recommended direction of refrigerant flow is from under the seat. In this installation, the stem torque required to close the valve under system pressure is generally manageable. For larger valves, this same flow direction can create a problem.
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Improving Operating Efficiency Using Hand-Held Devices
Many HVAC service contractors are still performing their inspection and service activities and daily tasks using manual, paper-based forms. However, by supplying simple-to-use automation tools to your staff, management can increase productivity, improve the use of resources, and improve profitability.
By Eitan Shibi
For The News
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Selecting HVAC Equipment Upgrades On The Web
A Virginia contractor involved in new residential construction has developed a Web site for its builder partners to enable homebuyers to see a standard HVAC system along with upgrade options. This site is now available to other contractors and builders.
By Greg Mazurkiewicz
Of The News Staff
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How To Select The Best Oil Cooler
Oil-flooded screw compressors use oil for lubrication, sealing rotating components, and absorbing heat. How do you choose the best oil cooler for your application? Become acquainted with the design, components, and benefits of various systems on the market.
By Barb Checket-Hanks
Of The News Staff
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