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ApplianceGuru.com: The Samurai Appliance Repair Forums > Do-It-Yourself Appliance Repair Help > The Kitchen Appliance Repair Forum > Tecumseh AE3440A in Pepsi (BEER) machine |
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| Moderated by: RegUS_PatOff, Pegi, appl.tech.29501 |
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| Tecumseh AE3440A in Pepsi (BEER) machine | Rate Topic |
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| Posted: Sat Aug 8th, 2009 02:51 am |
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1st Post |
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Brownac1983 Merit Apprentice Appliantologist
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How much of a pressure difference should I get across my compressor? I'm working on an old Pepsi machine for my garage. It was an R-12 system that was not cooling. I'm trying to use Hotshot R-414b (direct R-12 replacement), but I can't seem to get below 40 degrees, regardless of the refrigerant charge. The compressor makes 100 PSI above the return line pressure. Is that enough?It's roughly the same setup as an old fridge/freezer. It cools best when you overcharge it until the return line sweats from condensation, but I know that will damage the compressor after a while. All coils are clean, and all fans are running. Any thoughts? I think it might be time for a compressor transplant. Thanks.
____________________ I just want cold beer... Is that too much to ask?? |
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| Posted: Mon Aug 10th, 2009 03:55 am |
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2nd Post |
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RJ Kanary Senior Apprentice Appliantologist 
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What's the low side pressure? In a typical R-12 automotive A/C system, to get an evap temp of 35 degrees, the target low side was in the mid to low thirties, with a high side of 200 or higher depending on ambient and load. RJ
____________________ RJ Kanary ASE® Certified Master Automotive Technician |
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| Posted: Mon Aug 10th, 2009 11:33 am |
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3rd Post |
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Brownac1983 Merit Apprentice Appliantologist
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At 30 PSI low side pressure, I could only manage 130 PSI high side pressure. I'm in the process of installing a r-134a compressor from a newer fridge to see if that'll help. I think the old compressor was just worn out.
____________________ I just want cold beer... Is that too much to ask?? |
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| Posted: Mon Aug 10th, 2009 09:38 pm |
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4th Post |
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denrayr Sublime Master of Appliantology 
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its probably designed for mid temps so 40 degrees would be right on target
____________________ RedRock Appliance Service 435-773-7838 http://www.redrockrepair.com Serving St George and Southern Utah |
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| Posted: Mon Aug 10th, 2009 09:39 pm |
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5th Post |
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denrayr Sublime Master of Appliantology
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Brownac1983 wrote: At 30 PSI low side pressure, I could only manage 130 PSI high side pressure. I'm in the process of installing a r-134a compressor from a newer fridge to see if that'll help. I think the old compressor was just worn out. does the btu rating match? you cant just frankenstein this stuff together, the system is designed to work at a certain capacity.
____________________ RedRock Appliance Service 435-773-7838 http://www.redrockrepair.com Serving St George and Southern Utah |
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| Posted: Tue Aug 11th, 2009 03:19 am |
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6th Post |
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Brownac1983 Merit Apprentice Appliantologist
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The old system didn't have a btu rating anywhere that I could find, and information on that model is hard to find, since Choice-Vend hasn't been in business in many years. I got a newer R-134a compressor with the same horsepower and running amp draw, flushed the old oil out of the evaporator and condenser piping with alcohol, brazed in a new filter/drier and the new compressor, held a vacuum for several hours to ensure evaporation of any residual alcohol, and filled with R-134a to 35PSI suction pressure. discharge pressure was right at 200PSI on startup. System is cooling well and pressures have settled out at 15PSI suction and 155PSI discharge. I'll see after an overnight run what the temp stabilizes at.
____________________ I just want cold beer... Is that too much to ask?? |
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| Posted: Tue Aug 11th, 2009 05:27 am |
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7th Post |
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denrayr Sublime Master of Appliantology
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nice work. i've never flushed a system with alcohol, how did you do that?
____________________ RedRock Appliance Service 435-773-7838 http://www.redrockrepair.com Serving St George and Southern Utah |
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| Posted: Tue Aug 11th, 2009 06:12 am |
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8th Post |
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RegUS_PatOff Fellow, Academy of Sublime Masters of Appliantology 
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denrayr wrote: .... i've never flushed a system with alcohol, how did you do that?...I flush my system with alcohol regularly 
____________________ RegUS_PatOff http://www.youtube.com/watch?v=oPAY2LsKVEw my video production: “Easter Seals Walk With Me” (also in HQ) http://www.youtube.com/watch?v=-EBiLyYXMiA Upon leaving this Earth "Do you want the Smoking or Non-Smoking section ?" |
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| Posted: Tue Aug 11th, 2009 11:09 am |
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9th Post |
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Brownac1983 Merit Apprentice Appliantologist
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When you have the compressor removed and the filter/drier removed from the condenser outlet, just tip the evaporator and condenser on their side and pour a cup or so of technical grade alcohol in each one. Slosh it around for a few minutes and then blow it out with shop air. When everything's back together, hold a vacuum for several hours to ensure all of the alcohol evaporates before you charge. This gets all of the R-12 oil out of the lines so that it won't react with the synthetic R-134 oil and sludge up.
____________________ I just want cold beer... Is that too much to ask?? |
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