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ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > The Kitchen Appliance Repair Forum > Sub Zero 590 Troubleshooting Guide |
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| Moderated by: BrntToast, RegUS_PatOff, appl.tech.29501 | Search Our Sites for More Info! | Page: 1 2   |
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| Sub Zero 590 Troubleshooting Guide | Rate Topic |
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| Posted: Mon Jul 19th, 2010 10:13 pm |
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1st Post |
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ricksi Grasshopper
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I saw a link in another thread to a 600 Series troubleshooting page which listed the R134a PSI/Temperature relationships for that unit. Is there one I can get for the 590? Or better yet is there a complete troubleshooting guide? When checking the suction PSI, they indicate cut-in/cut-out readings. I'm used to a psi/temp relationship while a unit is running (AC's), why is it expressed as cut-in/cut-out PSI's? -Thanks Last edited on Mon Jul 19th, 2010 10:31 pm by ricksi |
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| Posted: Mon Jul 19th, 2010 10:38 pm |
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2nd Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology 
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SZ 500 series link PM'd
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Mon Jul 19th, 2010 10:58 pm |
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3rd Post |
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ricksi Grasshopper
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Thanks, but I already have the service manual. It doesn't cover the sealed system. The link I saw in another post was in this thread: http://applianceguru.com/forum1/15400.html It refers to a refrigerant chart for the 600 series.
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| Posted: Mon Jul 19th, 2010 11:11 pm |
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4th Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology
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ricksi wrote: Thanks, but I already have the service manual.... did you check the Technical Section starting on PDF page 99 ?
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Mon Jul 19th, 2010 11:19 pm |
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5th Post |
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ricksi Grasshopper
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Yes, which is why I asked about cut-in/cut-out PSI's. It states the following: Suction Pressure(PSIG) Cut-in/Cut-out 39/9 I'm not clear on Cut-in/Cut-out. I assume it's when the compressor switches on and off. Is the 9 PSI the running suction reading and the 39 is the equalized at rest pressure prior to the compressor switching on? The chart I referred to also details the temp/pressure relationships which I'm more familiar with. It sounds like there is no trouble shooting manual from sub-zero, correct?
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| Posted: Mon Jul 19th, 2010 11:42 pm |
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6th Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology
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that's all there is ..
____________________ The new repair forums==> http://appliantology.org RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” http://www.youtube.com/watch?v=-EBiLyYXMiA |
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| Posted: Tue Jul 20th, 2010 01:39 am |
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7th Post |
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ricksi Grasshopper
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What approximately should the suction PSI be when the refrig side is running at 35-40 degrees?
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| Posted: Tue Jul 20th, 2010 01:45 am |
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8th Post |
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micgla Master Appliantologist 
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I do alot of sealed systems on these units. I leave em at 8 lbs if the refrigerator is cooling at those temps....
____________________ I Don't know yet! |
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| Posted: Tue Jul 20th, 2010 02:15 am |
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9th Post |
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ricksi Grasshopper
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Thanks. Maybe Sub-Zero's cut-in/cut-out psi's correspond to the start PSI (36), when the evaporator temp is high, down to 9 psi when it is at the optimum temp. I'd really like to know for sure.
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| Posted: Tue Jul 20th, 2010 02:27 am |
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10th Post |
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micgla Master Appliantologist
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Thats exactly right. Not an exact science i've found out tho. Just charge the unit with a charging cyclinder and adjust to factory specs. and your pretty much good to go. However, i've had to return a few times to adjust also, so again not an always exact science, but close..... Last edited on Wed Jul 21st, 2010 05:42 am by micgla ____________________ I Don't know yet! |
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| Posted: Tue Jul 20th, 2010 02:37 am |
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11th Post |
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ricksi Grasshopper
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Thanks again.
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| Posted: Wed Jul 21st, 2010 04:36 am |
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12th Post |
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certified tech group 51 Fellow, Academy of Sublime Masters of Appliantology 
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what is the original problem with the unit??? Not cooling?? trying to check the charge in the system??? The best way, with no call backs, # 1) evacuate the system, and charge by weight........... # 2) if the unit has a low charge , you can add refrigerant till the evaporator is fully frosted.......... I use method number 1............... Too many variables using the low side to measure refrigerant charge on a 6 oz. system.............
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| Posted: Wed Jul 21st, 2010 09:57 pm |
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13th Post |
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ricksi Grasshopper
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The unit wasn't cooling below 50 degrees; evaporator had ice buildup on freon entry point. The pressure was definitely low. I raised it while monitoring the temperature and frost level on the evaporator as well as current draw. According to the 590 specs, the cut-out reading is 9psi at 35 degrees and the amp draw is 0.8 amps. I did not see uniform frosting and even temps across the evaporator until the psi was around 16psi at appox. 35 degrees at cut-out. In the interest of accuracy, I evacuated the system and filled the unit with 7oz of R134a (as specified) using a charging cylinder. At best the evaporator was frosted a quarter of the way down, and the coil temp was 17 where frosted to 36 degrees below. Also the compressor amperage was never .8 amps as specified regardless of the charge. It holds steady at 1.1 -1.2 depending on the charge. I took a look at the 690 manual and noticed that it uses essentially the same sealed components including the compressor and evaporator. However, the specs call for 10oz of R132a, 1.2 amps, and 16psi at cut-out. So I added an oz of R134a at a time while carefully monitoring the result. After adding 3oz, the evaporator is almost fully frosted (lowest row is marginal) with an even temperature. Cut-out is 16psi and the current draw is 1.2 amps. Anyone have any thoughts?
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| Posted: Thu Jul 22nd, 2010 12:48 am |
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14th Post |
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micgla Master Appliantologist
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Freon leak at evap. coil is my best quess....Do you have access to a leak detector? It prob. won't leak back out for awhile, i always advise customer that he has a leak and quote to repair leak vs adding freon. Charging by weight is another accurate way of charging systems, seems to be the way lots of servicers go... maybe Certified Tech Group 51 could explain the correct method of doing this??? thanks Last edited on Thu Jul 22nd, 2010 12:53 am by micgla ____________________ I Don't know yet! |
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| Posted: Thu Jul 22nd, 2010 02:00 am |
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15th Post |
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ricksi Grasshopper
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I have a Yokagawa detector that usually finds a leak if one exists, but didn't find one. But you're right, there must be a slow leak because the freon found a way out, so I'll keep an eye on it. I'm hoping that someone with a lot of Sub-Zero experience can tell me why the 10oz R134a specified for the 690 seems to be the optimum charge for the 590 despite the 590 spec of 7oz.
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| Posted: Fri Jul 23rd, 2010 04:13 am |
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16th Post |
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certified tech group 51 Fellow, Academy of Sublime Masters of Appliantology
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The leak is in the evap coils ( 93 % chance ) I would evacuate the system, add 2 oz. of refrigerant , pressurize with dry nitrogen to 125 p.s.i....using a sniffer will get you close but to pin point the pinhole you will need to use bubble detector ....The hole will probably be in the fin area............If you are lucky it could be in the tube......just seal with aluminum heat stick.......... ( dis charge the system first ) ........ You are making an easy job difficult.... ( temps. at cut-out ...cut-in...psi at certain temps... getting a headache  ) Plus, get your self a digital scale, for me, it is more accurate.............. After recharging the system, if I am close to 10 p.s.i., I will be O.K. ....Old system, parts are wearing down........... 3 oz. over in a 7 oz. system.. asking for trouble......... watch the return line for frost returning to the compressor.........
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| Posted: Fri Jul 23rd, 2010 04:26 am |
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17th Post |
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ricksi Grasshopper
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Sorry about the headache. Will argon work just as well?
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| Posted: Fri Jul 23rd, 2010 05:06 am |
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18th Post |
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certified tech group 51 Fellow, Academy of Sublime Masters of Appliantology
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" ya got me, Skippy " Do not know how the two will react.......how much moisture is in the argon???
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| Posted: Fri Jul 23rd, 2010 06:08 am |
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19th Post |
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ricksi Grasshopper
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Argon is a dry inert gas used commonly when Mig welding.
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| Posted: Sat Jul 24th, 2010 03:24 am |
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20th Post |
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Moostafa The Ayatollah of Appliantology 
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Hello, my miggling friend. Argon can contain more moisture than is not suitable for sealed system work unless it has been specially treated to remove moisture. Avoid a bigger headache down the road and purchase an inexpensive bottle of refrigeration-grade nitrogen.
____________________ Allahu Akbar! Moostafa |
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