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This week is 100*F with the forecast for the same weather for the next full week. This is a video to show the extremes we had to go through due to a couple months delay in the supply chain of the brand of equipment my supplier carries. Nothing in this video is normally done in a residential setting...unless its someone like me doing it for a son or daughter.
Backstory: This downstairs system was removed and totally updated with properly sized duct and air handler to satisfy the space last fall. To take care of the second floor a second and separate system was installed in the attic. Fast forward about two months ago. I ordered the outdoor unit and found that there would be a delay in delivery due to the manufacturer cutting production of the current models to 'retool' to begin producing the new line of equipment utilizing the newly developed refrigerant. The supplier did not perceive just how long the 'delay' was to become. With no cooling on the lower level of the home, this hot snap was making the home almost unbearable in the afternoons and evenings. So I cooked up this 'idea'....
In disassembling the old furnace from the duct, I left the refrigeration system fully intact and shifted off the side of the basement to allow the new air handler and duct to be installed. The reason being that the new system will use the same refrigerant, R-410, and leaving the lines connected eliminated the need to seal them from contaminants over the course of the winter. THAT turned out to be a quite fortunate decision to have made.
The video explains the setup, but what we did was connect two systems 'in series', by pumping the cold air generated by the old system into the return air of the new system. At that point the new air handler receives the now 'pressurized' COLD return air and forces it with a bit greater force down the new trunk line to distribute it throughout the first floor of the home. Follow the video to better understand the way the two systems are connected electrically, but it is really simple.
Commercially we have done this with large capacity systems that required a tremendous amount of outdoor 'fresh' air. On one job for example, we took a pair of 50 ton roof top units opened to 100% outdoor air. We slowed the blowers to deliver only 300 cfm per ton to give greater potential for moisture removal. Those were connected to the out door air openings of a a pair of 60 ton (yes, 10 tons larger) roof top units and used the dehumidified outdoor air to enter a mixture of actual return air from inside the building to satisfy the 55* discharge air settings of the larger units. This obviously is a cliff notes version of the way they were controlled, but you get the idea.
So essentially that commercial system was connected as a pair of two units in 'series', very similar to this one. This one in my sons home however, has a lot less controls. There is little to no chance any of you will encounter this or anything resembling this set up but remember: IT IS ONLY TEMPORARY !!! We would not have had to do this had the weather held off for a while yet, but the indoor comfort level was at this point non-existent.
#sheetmetalhack #dontdoasIsayanddontdoasIdo #airhandlerinstall
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