Arkansas HVACR NewsMagazine January 2024

HVACR NewsMagazine January 2024

Tech News

testing, be sure to check out our "HVAC Blower Motor Class! PSC Motor Speeds, Colors, Ohms, Current, Shorts, Air Restrictions!" video. Package units may also use ECM blower motors to operate. These motors do not use capacitors, however they have removable modules that can be inspected for damage. If a module appears to be damaged, the ECM motor will need to be replaced. For more on testing ECM motors, check out our video on "Fast Easy ECM FAN MOTOR Troubleshooting! ECM Blower Motors with Spade Terminals!"

Some Airflow Tips

• If the supply duct rots and return duct are exposed to the elements, one or both may rot out, resulting in the unit working inefficiently. • If the supply duct rots, it may result in air being blown outside the building. • If the return duct rots, it may result in outside air being sucked into the system. • A special shroud may need to be constructed around the ductwork to protect it from the elements. • An opening may develop where the ductwork enters the building. This opening may allow an animal access to the crawl space where it can enter the building and damage the flex ducts (ripping into them and causing them to collapse), or other parts of the unit.

Problem #10: Cracked Heat Exchanger

Heat exchangers in a package unit can deteriorate leading to cracks and holes in the heat exchanger tubing. A cracked heat exchanger can be a serious problem, as carbon monoxide may enter the building because of this. Often times, this kind of issue is indicated by a tripped flame rollout switch. If a cracked heat exchanger is suspected, steps should be taken to verify the condition of the heat exchanger. This can be done by first turning off the power and either using a scope or by manually accessing the heat exchanger compartment. For safety reasons, it is imperative that a cracked heat exchanger be replaced in a timely manner.