Service and Maintenance

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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.

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.

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

If a potential relay is malfunctioning, the compressor motor is in danger of not starting, stalling, locking rotor, or even burning out. That is why technicians should understand how to troubleshoot potential relays.

Residential HVAC system design is a foundational step in the process to deliver predictable comfort, and estimating the heat loss and gain of a dwelling is the cornerstone of that process.

Service technicians need to be careful when reading the pressure/temperature chart because if they choose the wrong values, they will make mistakes diagnosing the system.

Is performing a Manual J load calculation needed in residential retrofit applications? For the industry energy experts sitting behind a desk, yes. For those of us in the real world, it doesn't make sense.

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

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.

It’s our job to control different combustion gases to prevent them from causing harm. Likewise, we also must focus on recognizing and improving the parts of our personality that may make us toxic to others.