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What is a fixed metering device - Heating & Cooling

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Hi, a metering device is a part of a air conditioner, freezer, and refrigerator that meters freon into the evaporator coil of the unit. A fixed device is a capillary tube on smaller units that is non adjustable. On units that are 5 tons and larger, the metering device is called a thermostatic expansion valve which can be either fixed at a factory setting, or can be adjusted to meter a certain amount of freon into the evaporator coil to flood it, or fill it with the correct amount of freon gas. They can sometimes get plugged up due to a dirty filter drier on the liquid line of a system, and will need to be changed. They are mounted right next to the evaporator coil and can be a job to change out. Cap tube types are brazed or silver soldered on, and some of the expansion valves can also be of the brazed type or have flare connections on them. They have a screen inside that can be cleaned, but its best when you tap into a system to change it out. I hope this has helped you out. Please don't forget to rate me on this as I no you will be kind.
A/C, Heating, & Refrigeration Contractor

Posted on Nov 10, 2010


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