Technical

“Technical” articles describe troubleshooting scenarios and HVACR system design in-depth.

ARTICLES

Nationwide 250 hp Boiler Achieves 5 ppm NOx Performance

July 26, 2023

Equipped with an Oilon LN30 ultra-low NOx burner and Nationwide’s Eagle PLC-based Control System, the 250 hp package boiler achieved average emissions performance of 5 ppm NOx and 0 ppm CO (corrected to 3% O₂) during third-party testing.

Defining and Calculating Voltage Imbalance

Improper voltage is the one of the greatest causes of failed compressors in three-phase units

Paul Flora

June 28, 2023

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Saving one compressor will cover the cost of a voltage monitor and then some.

Harlan is New Business Development Manager at WAGO

June 6, 2023

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Amy Harlan, who has an extensive background in electronics and device connectivity, is the new business development manager for device connection technology at the global electronics technology firm.

Public Review of Proposed Revisions to ACCA Manual SPS (HVAC Design for Swimming Pools and Spas)

April 26, 2023

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The 30-day ANSI public review period closes May 14.

The 3-4-5 Rule for Walk-In Coolers And Freezers

The box must remain square or else the panels will not fit together

Joe Marchese

November 29, 2021

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During the installation of a new walk-in cooler or freezer, it is imperative the box remain square and level during the assembly of its panels.

Refrigeration and air conditioning compressors.

How to Measure Net Oil Pressure

Many larger refrigeration and air conditioning systems have oil pumps

John Tomczyk

November 24, 2021

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Before servicing any refrigeration or air conditioning systems that contain an oil pump, technicians should make sure they understand the difference between net oil pressure and oil pump discharge pressure.

How Much Do You Know About HVAC Service?

Take this HVAC quiz to see what you know

Gordon White

October 29, 2021

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Whether you’re the owner of an HVAC contracting company or a student at a tech school, take this quiz to find out how much you know about servicing equipment.

Propane Can Offer HVAC Customers A Reliable Option for Backup Power

Help customers achieve peace of mind, energy security by talking preparedness early

Bryan Cordill

October 3, 2021

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The growing electricity demands being placed on the country’s century-old grid are resulting in an increased number of unexpected power outages across the U.S.

Understanding the Formula to Calculate BTUH

Where does the 1.08 factor come from?

Carter Stanfield

June 20, 2021

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The "magic number" 1.08 is convenience factor. It is a bunch of math combined into one factor as a shortcut, although sometimes more precise calculation is better.