Maintenance for hvacr - Articles - Page 2

NADCA Fall Technical Conference Offers Hands-On Training

June 28, 2023

NADCA’s annual Fall Technical Conference features hands-on training during which attendees can use real-world scenarios to develop practical skills.

When to Repair or Replace an Evaporator Coil

Where the leak is located may determine whether a coil can be repaired

Joe Marchese

April 12, 2023

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When faced with a leaky coil on a reach-in cooler, a decision needs to be made whether to repair or replace it. The final decision may come down to where the leak is located.

Checklists Can Help Determine What Is Causing the Problem in a Refrigeration System

Confusing High-Side Temperatures

John Tomczyk

March 22, 2023

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There are several reasons why the compressor discharge temperature of a refrigeration system can be high when the condensing temperature is not, and a checklist can help a technician figure out the root problem.

Proper Charge Is Critical for Microchannel Coils

Incorrect amount of refrigerant could reduce performance, efficiency, and reliability

Joanna R. Turpin

March 20, 2023

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Microchannel coils are lightweight, offer better heat transfer, and use less refrigerant than traditional fin-and-tube coils; however, care must be taken when charging, as even a few ounces could reduce a systems’ performance, efficiency, and reliability.

The Surprisingly Heavy Burden of Metal Coils

In cooling towers, added weight isn’t just a problem for total rooftop weight; it also complicates maintenance.

Micah Curtis

March 9, 2023

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Polymer elements in cooling towers — or entire towers made of composite materials, like Fiber Reinforced Polymer (FRP) — can reduce the weight by up to 50%.

The NEWS Learns How To Braze Aluminum

Maria Taylor

Hannah Belloli

March 6, 2023

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At this year’s AHR Expo in Atlanta, Georgia, two editors from The ACHR NEWS visited Harris Products Group to learn how to braze aluminum.

Diagnosing Ductless HVAC Systems

What to look for when a ductless system isn’t working right, or at all

Matt Jachman

February 21, 2023

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The use of ductless heat pump HVAC systems has broadened considerably since they were introduced to the U.S. market decades ago, but their technology isn’t familiar to all technicians or in all parts of the country.

Troubleshooting Defrost Timers

A faulty defrost timer in a refrigeration system can lead to problems

Joe Marchese

February 21, 2023

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Technicians should learn how to troubleshoot defrost timers, as they can be the culprit if a freezer that uses an electric heater as its supplemental heat source has a frozen evaporator coil.

Diagnosing a Heat Pump Defrost Sensor

Matthew Akins

February 19, 2023

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A split system heat pump's defrost sensor is used to detect ice buildup on the heat pump's outdoor coil. The exact way in which a defrost sensor works can vary.