Uses. For example, if the evaporator coil was added to the furnace then measure the static pressure drop across the furnace only. Just like any other appliance, your air conditioner needs regular servicing and maintenance in order to stay in tip-top condition. When evaluating the performance of evaporator airflow, you need to use a monometer with a static pressure tip and hose to connect them. There are 3 measurements you’ll take to verify your OAL. Fins To determine the face area of the coil we need to measure the height and length of the fin pack. Make sure to measure the top/bottom and side flanges. Measure the bottom connection from the bottom of the coil to the tube center of the connection tube. After measuring the static pressure drop, compare it to the external static pressure (ESP) value stamped on … This can be done by using a caliper or a tape measure. Once all the construction details have been verified, the performance and construction of the coil should line up beautifully with what is called for. The evaporator coil of your air conditioner is crucial for the unit’s performance. If you've already got a condensing unit outdoors, then you probably want to match the new evaporator with the existing equipment. Many RTU's are equipped with bent condenser coils. Let’s assume you’ve priced that replacement coil right and you’ve been awarded the job. They can be found on each of our coil pages. Evaporator coils are essential to the proper functioning of your air conditioning unit, ensuring an optimal climate in your home or business. The tape measure should begin and end inside of the end flanges. Next we need to measure the number of fins per inch. (Sometimes full conversion occurs just before the refrigerant reaches the outlet.) 2. Finally we want to measure how far the headers and connections extend out from the face of the coil. Evaporator coils are one of two main parts of the air conditioner. Tube diameter is the size of the tubes running through the coil. Go ahead and take the finned height, only measuring from the top to the bottom of the fins on one end of the coil (not in the middle of the coil face). In order for your AC to work well, the coils need to be free of dirt and dust. Next we need to measure the number of fins per inch. Fitting the coil in the existing space with the least amount of labor has everything to do with measuring a coil. Rod Butler. Coils are typically made of copper, steel, or aluminum, and consist of tubes bent in U-shapes and set into an A-frame design of two panels. Normal choices are: hot water, chilled water, steam, evaporator (which is the cooling coil in an air-conditioner), and condenser (the outdoor coil for an air-condtioner). As pressure drop across the coil increases, the amount of energy required to move a volume of air across the evaporator also increases. Nationwide Coils Inc. provides replacements of OEM coils and is not affiliated with any of the manufacturers listed on our website. Record the distance from the bottom of the coil’s casing to the center of each connection point: Record the distance off the connections off either face of the coil: And the record the distance in or out from the end of the fin pack: The connection locations measured on, say, a dual-circuited DX coil can be backed up/verified by taking the center-to-center distance of the two connections. The total surface area of the condenser coil measures 17.1 ft2 (1.6 m2). This is another point where I’ll measure the total available length of the unit, to ensure my OAL is appropriate and to see what extra room we have, if needed. Evaporator Coil Needs Cleaning - If your evaporator coil is dirty it'll make absorbing the heat difficult. How the evaporator and condenser coils work together. If this all seems like a lot of measuring that should be handled by an expert, that’s because it is! In a recent post, we went over how to accurately measure a DX Evaporator Coil for price. The tape measure should begin and end inside of the end flanges. Evaporator coils and filters tend to be the biggest contributor to excessive total external static pressure (TESP). Now, add the fin length to the MAX dimension: that’s the end of fin pack to outside of U-bend at the other end of the coil. The evaporator coil in an air conditioning system works to allow compressed cooling chemicals (like Freon) to evaporate from liquid to gas while absorbing heat in the process. IMG_8009.jpg (85.1 KB, 42 views) 10-28-2011, 12:56 PM #2. This can help you if you run into any issues verifying the finned height. To Evaporator Coils-One Condensor; rafter size; breaker size; Size of condenser ***IMPORTANT*** You Need To Register To View Images. 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