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randen · 11-23-11, 08:01 PM

I had left the GSHP purr away all night. The office floor temp made it to a solid 75 Deg F. The shop area never made it past 62 Deg F The overnight outside temp dipped below freezing with some wind. The ground loop temp didn't change. Although the shop is comfortable enough now but when winter takes a big dip I don't think it will remain so. As AC hacker had suggested I played with the amout of refrigerant charge.With the gauge set installed and the amp meter as well as a digital temp probe on the highside tube a temp of 176 Deg F was read. Adding a little propane slowly got me to 179 Deg F the current draw didn't change much the high side pressure rose 10 psi. As more propane was added the current rose to 7.5 A and the temp dropped. As I removed propane the temp peaked and then dropped again and the current dropped. The sweet spot is 210 psi High 45 psi low 6.4 A and 179 Deg F out to the HX. Well it looks like the verdict is in, we need to step up to the 3.5T compressor. Thanks for the help and inspiration

Randen

11-23-11, 08:01 PM	#1008
randen Uber EcoRenovator Join Date: Apr 2011 Location: Strathroy Ontario Canada Posts: 657 Thanks: 9 Thanked 191 Times in 129 Posts	The results of 30 hrs of running the GSHP I had left the GSHP purr away all night. The office floor temp made it to a solid 75 Deg F. The shop area never made it past 62 Deg F The overnight outside temp dipped below freezing with some wind. The ground loop temp didn't change. Although the shop is comfortable enough now but when winter takes a big dip I don't think it will remain so. As AC hacker had suggested I played with the amout of refrigerant charge.With the gauge set installed and the amp meter as well as a digital temp probe on the highside tube a temp of 176 Deg F was read. Adding a little propane slowly got me to 179 Deg F the current draw didn't change much the high side pressure rose 10 psi. As more propane was added the current rose to 7.5 A and the temp dropped. As I removed propane the temp peaked and then dropped again and the current dropped. The sweet spot is 210 psi High 45 psi low 6.4 A and 179 Deg F out to the HX. Well it looks like the verdict is in, we need to step up to the 3.5T compressor. Thanks for the help and inspiration Randen