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Little Rock, AR
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Montreal, Quebec
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Lafayette, Louisiana
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Lexington, KY
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 Geothermal heat pump question
[#4] Posted: 05/23/2010 - 3:08:02 PM |  |  |
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Kevin, you can expect about the same delta from geothermal systems that you get with other systems. But . . . the whole temperature differential method for determining whether an A/C system is operating correctly is iffy, at best.
Lots of things can screw up the delta: improper ductwork, a dirty coil and/or filter, closed registers. If it's warm outside--80 degrees or above--all you really have to do is check the refrigerant lines. If the suction line is cold and sweating, and the liquid line is warm, the system's working like it's supposed to. You can also shoot the lines with an infrared thermometer. If everything INSIDE the house is okay, the delta of the refrigerant lines will pretty closely mirror what you're gonna get within the interior.
I'm not saying I never check the temperature of the supply-air swooshing out of the register, I always do, but if it's twelve or thirteen degrees rather than the 15-20 degrees we were taught to look for, that's not always a sure sign that there's something wrong with the system.
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louisville, ne
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Geothermal heat pump question
[#5] Posted: 05/23/2010 - 8:50:57 PM | | |
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Id like to see atleast 20-25 degree drop across the coil on any cooling system myself
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State: PA & NJ
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Swansea, IL
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Geothermal heat pump question
[#7] Posted: 05/24/2010 - 05:31:16 AM | | |
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I've always heard 14 - 21, but I don't have a source.
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Mark A. Perry
www.ahis1.com
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louisville, ne
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Geothermal heat pump question
[#8] Posted: 05/24/2010 - 5:45:34 PM | | |
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Quote: Originally posted by Bill KibbelQuote: Originally posted by plummen
Id like to see atleast 20-25 degree drop across the coil on any cooling system myself
Based on what standard? What do you say when it's 19°. 
if its less than a 20 degree drop i start checking pressures and temps on lineset
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Gaston, Oregon
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Elizabethtown, PA
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Lafayette, Louisiana
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Geothermal heat pump question
[#11] Posted: 06/09/2010 - 1:22:56 PM | | |
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I'm in the habit of checking both heat and cool functions, regardless of whether is an all electric, gas powered, heat pump or geothermal. There are defects that can occur that would allow a heat pump system to cool but not heat.
Marc
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"If Guam gets too overpopulated, it might tip over."
Congressman Hank Johnson (D) GA |
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Temperature _Differential_Chart_Carrier.pdf
