Sanyo 24KHS72 Mini-Split DIY REPAIR project

Xringer · 09-26-11, 02:07 PM

Got some chill testing done. I found the 4-Way valve default in T-Run mode is heating.

After seeing some high power use in heating, I decided to disconnect the 4-way valve,
and do my testing today in chill-out mode.
Note: The 4-Way valve is marked 230vac.
I should be able to control the heat/cool mode for defrosting, with a 240vac SSR.

Cooling seemed to work pretty good with the small charge (~26 oz) of R410a, but the pressure surprised me.
It was down at 40 PSI ! Is that -7 deg F?? No wonder the copper got frosty so fast!

During chill mode testing, the garage temp was 80F, the line voltage was 238 vac.
Current would slowly climb and become steady at 5.4A (1.3kw).
39-40 PSI at the service port took the 1/4" test loop down to 24F in just a few minutes.

http://ww2.justanswer.com/uploads/pe...a_pt_chart.JPG

I tried little Heating mode at the end, but the high pressure scared me.
It shot up to 450 PSI real fast, and looked like it was going to creep up to 500.
450 PSI indicates about 126 degs F, but I didn't leave it running because
I had the low pressure gauge side connected and didn't have any water in the test loop bucket..

I did not do any long run times and kept an eye on the compressors heat, using the IR temp pistol..
I'm worried about running on such a small amount of R410A.

09-26-11, 02:07 PM	#21
Xringer Lex Parsimoniae Join Date: Feb 2009 Location: Woburn, MA Posts: 4,918 Thanks: 114 Thanked 250 Times in 230 Posts	Testing is good so far. Got some chill testing done. I found the 4-Way valve default in T-Run mode is heating. After seeing some high power use in heating, I decided to disconnect the 4-way valve, and do my testing today in chill-out mode. Note: The 4-Way valve is marked 230vac. I should be able to control the heat/cool mode for defrosting, with a 240vac SSR. Cooling seemed to work pretty good with the small charge (~26 oz) of R410a, but the pressure surprised me. It was down at 40 PSI ! Is that -7 deg F?? No wonder the copper got frosty so fast! During chill mode testing, the garage temp was 80F, the line voltage was 238 vac. Current would slowly climb and become steady at 5.4A (1.3kw). 39-40 PSI at the service port took the 1/4" test loop down to 24F in just a few minutes. http://ww2.justanswer.com/uploads/pe...a_pt_chart.JPG I tried little Heating mode at the end, but the high pressure scared me. It shot up to 450 PSI real fast, and looked like it was going to creep up to 500. 450 PSI indicates about 126 degs F, but I didn't leave it running because I had the low pressure gauge side connected and didn't have any water in the test loop bucket.. I did not do any long run times and kept an eye on the compressors heat, using the IR temp pistol.. I'm worried about running on such a small amount of R410A. Last edited by Xringer; 09-26-11 at 03:25 PM..