Maintenance for hvacr - Articles - Page 5

Proper Charge Is Critical for Microchannel Coils

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

March 20, 2023

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

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-Oster

March 6, 2023

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

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

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

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.

Defining Duct Renovation: Part 1

David Richardson

February 18, 2023

Duct renovation is one of the largest missing pieces in our industry. To create a foundation, let’s look at two duct renovation approaches.

Basic Furnace Maintenance and Troubleshooting

Layan Dahhan

January 14, 2023

The ACHR NEWS visited Flame Furnace in Warren, Michigan to learn how to do maintenance and basic troubleshooting on a furnace.

Avoid Careless Mistakes During Preventive Maintenance

Simple tasks can turn into big problems if proper precautions are not taken

Joe Marchese

January 13, 2023

Conducting planned maintenance on refrigeration equipment is beneficial to both equipment owners and contractors. However, simple tasks can turn into problems if not done properly or without taking the necessary precautions.

Refrigeration OEM Revamps Brazing Operation

Delfield able to cut costs and save time, while keeping quality high

Aaron Storie

January 3, 2023

Successful companies seem to always look for ways to improve operations. The Delfield Co. recently demonstrated this by taking an in-depth look at their brazing processes for refrigerant systems.