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07-23-2011, 11:56 AM | #31 | |
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This much I can tell you if it is 410 it will have an expansion valve or an R-22 that is a 13 SEER or higher it will have one as well. Most of the older units don't have them but if someone has changed a condensor and left the old coil then they should of added a TXV. Here is something that I had to learn the hard way. That a load of people don't know. If you are working on an American Standard or a Trane and you have to change a compressor out. There are 2 line driers that look like mufflers on the side of the condensor where the lines come out of the coil and go back to the compressor. I didnt know about those so I put a new line drier at the evaperator coil and it basicly made a restriction. Are you working on anything other than residential split systems yet?
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07-23-2011, 12:06 PM | #32 | |
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I haven't taken any classes on commercial systems yet, and I have PTACs at one of my properties and all I've learned from them is that they are a complete pain in the ass. |
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07-23-2011, 12:24 PM | #33 | |
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If you know the series of operations and the flow of refrigerant you should be alright. Things just get bigger. Meaning 2 speed equipment, bigger tonage attained by multiple compressors and so on. Be sure to learn your 3 phase power stuff for the commercial work. Now you will find some equipment that uses amonia as its refrigerant in larger buildings. Be very careful with those units. Amonia is a lot more explosive than other refrigerants. PTACS do suck but they are basicly glorified heat pump window units. Cheaply made and not meant to be repaired much.
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07-23-2011, 12:36 PM | #34 | |
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07-23-2011, 12:39 PM | #35 |
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Good stuff Bug....thanks for the info.
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07-23-2011, 12:47 PM | #36 |
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Well they are wrong or they are taking a simplistic view in a very small house. Assuming you have plenty of ducts shutting off a room or two that are not being used will not hurt your system. Too little airflow can cause the coil to not get warm enough from the passing air which can be a problem.
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07-23-2011, 12:53 PM | #37 |
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This is from yesterday.
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07-23-2011, 12:53 PM | #38 | |
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07-23-2011, 12:55 PM | #39 | |
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07-23-2011, 01:04 PM | #40 | |
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If you have a 3 ton system. That equates to 1200 cfm's of air. The average bedroom will have a 6 or 7 inch piece of duct that feeds the register that you see in your floor. A duct calculator figured at .10 static pressure will tell you that a piece of 6" duct will flow about 100 cfm. A piece of 7" duct about 150 cfm. So you can only safely shut off 1 register in your home if you have a 3 ton system. Now there are exceptions. A variable speed blower will ramp up to make the difference up. If you have a zoned system the extra air will be put into the "dump" zone.
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07-23-2011, 01:22 PM | #41 |
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Just to clarify, here's an example from my own house. I've never been satisfied with how well my system cools, so I always used to keep the main bath vent closed. My thinking was that since it was a small room, and we were rarely in it for very long, that there was no sense in pumping a bunch of cold air into it. Plus I figured it meant that more cold air would go to the other rooms.
Well it turns out I was wrong on both counts, it's not sending any more air anywhere else, it's not making my system work any less harder, so I may as well have it open. And regardless of where it's coming from, the more cool air you have moving through your house, the better off you are. |
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07-23-2011, 01:31 PM | #42 | |
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Now is it safe and is it worth the savings is an entirely different argument but all things being equal smaller sq footage = energy savings.
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07-23-2011, 01:55 PM | #43 | |
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07-23-2011, 01:57 PM | #44 | |
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07-23-2011, 01:59 PM | #45 |
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Either way, do what works best for your home and makes you comfortable. I'm just throwing things out that have worked for me.
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