Service and Maintenance
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“Service and Maintenance” articles focus on troubleshooting service call issues and revisiting HVAC basics.

ARTICLES

Carrier Microchannel Technology

Proper Charge Is Critical for Microchannel Coils

Incorrect amount of refrigerant could reduce performance, efficiency, and reliability
Tn joanna 2017
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.
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Daikin Ductless Unit

Diagnosing Ductless HVAC Systems

What to look for when a ductless system isn’t working right, or at all
Matt jachman
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.
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Ice Breaker Joe Marchese

Troubleshooting Defrost Timers

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