Texasmark hit the nail on the head as far as what the slingers do on the condensor fan blades. Actually the older versions also had slingers and did this to an extent but still had a drain extend out the back for the majority of condensate to flow. The manufacturers do not care if they develop a machine that needs to have a higher degree of maintenance to maintain the rated efficiency....all they care about is the efficiency rating as it is tested in laboratory conditions. Kinda like gas mileage estimates in a car or truck !!!!
The dirty condensor (outdoor) coil is responsible for rejecting the heat transferred (via the refrigerant) from inside the house plus the heat of compression added to it by the compressor. As stated by Texasmark, the pressure and temperature of all refrigerants is directly proportional and it requires more horsepower (wattage) to do the work at the higher pressure caused by the airflow blockage created by the crusty dirt accumulation on the coil.
Efficiency goes down dramatically, the system runs too hot because of the high head pressure, the compressor begins running hotter because the warmer returning refrigerant doesn't cool it properly and eventually the compressor will cycle on its external thermal overload (internal on most single phase compressors of a capacity larger than around 12,000 btu). It becomes an endless circle unless it is kept fairly clean by annual cleaning.
WWGrainger will sell a acid based coil cleaner called "Foaminator" for around $14.00/gallon. It will foam profusely and force unbelieveable amounts of unseen dirt from between the fins. It is to be diluted and sprayed on with a pump sprayer and rinsed with a hose. It is friendly to the environment. Works wonderfully, just follow the directions.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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