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When is it Time to Replace a Coil?
2017/05/09
May 8, 2017
Air side plugging
 
Air side plugging of coils is nothing more than foreign material that has entered the finned tube coil and has drastically reduced the heat transfer of the coil. Chilled water and refrigerant evaporator coils in a supply air stream are prone to this problem. These are the HVAC coils that have multiple rows (usually between 4 and 12 rows) and can have anywhere between 8 and 14 fins per inch. Just based on their denseness, these coils can load up and reduce capacity by up to 50%. With these coils, a service technique to get by on a day-to-day basis is to simply increase the speed of the supply fan to overcome the extra resistance in the coils. This can only be done a few times over the years, since you will finally run out of options to increase the speed due to HP and fan restrictions.
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