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Author Topic: Subzero Compressor Replacement, What Did I Do Wrong?  (Read 120 times)

Offline tgoods

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Subzero Compressor Replacement, What Did I Do Wrong?
« on: September 01, 2012, 09:36:09 AM »
I quit doing sealed system work for a while and decided recently to start doing them again.  After yesterday's frustration, I might quit doing them again.  Did a refrigerator compressor job on Subzero 550.  Went to charge it and could only get it to take 3 oz., it takes 10 oz. I'm charging with R12 (yes, I still have R12) as a gas on the low side.  The low side won't draw down, it's showing 70psi and the high side is not much higher. The low side actually dropped pressure when I shut the compressor off. The compressor tech sheet showed the process tube on the same side as the high side tube.  That wasn't convenient so I used it for the suction line.  I've done that before with no problems. What did I do wrong?
How long should it take to do this job.  If I hadn't run into the problems, it would have taken me 3 hours.  I don't sweep charge, I use a vacuum pump and micron gauge.  It would be nice to get this down to 2 hours, if possible.

Offline JWWebster

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Re: Subzero Compressor Replacement, What Did I Do Wrong?
« Reply #1 on: September 01, 2012, 09:58:08 AM »
That is a weird ice box to start with. I belleive they want you to weigh in the charge. The unit have more than one evavoration plate don't it? I don't mess with subzero. Too much crapola to deal with.
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Offline tgoods

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Re: Subzero Compressor Replacement, What Did I Do Wrong?
« Reply #2 on: September 01, 2012, 07:29:59 PM »
Well, the only thing that made sense to me is bad compressor out of the box, right?  High low side and low high side means bad compressor.  So I go back today and hook up the gauges again. Low side goes right into a vacuum.  This fridge was thirsty, drank up another 7 ounces of delicious R12 juice in no time flat. The box is cooling again!  If someone can let me know why it wouldn't draw down the first time, that would be great. I'm going to go enjoy the three two day weekend.  :pint1:

Offline dab147315

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Re: Subzero Compressor Replacement, What Did I Do Wrong?
« Reply #3 on: September 02, 2012, 11:16:52 AM »
Tgoods You maybe right in your first post.As you said you stop doing seal system work for awhile .I have been doing this about 38 years now and did alot of seal system work for G.E and Sears years ago as i had no chose.But i do no, the more you do them the better and faster you can do them.In the old days when i work for G.E like 30 years ago they would have certain trucks and guys that just did seal system work.And i was one of them.Compressors lows sides all day long.If thats all you do you get better.But saying that you never no to the bitter end after you charge the system if all is well.Now almost 60 years old i do not want anything to do with installing compressors.They can go well or drive you to drink.Self employed for 30 years now .You can lose a lot of time if they go wrong.And other calls .My opinion.

Offline AJ

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Re: Subzero Compressor Replacement, What Did I Do Wrong?
« Reply #4 on: September 02, 2012, 11:41:20 AM »
I have not done any sealed system work since I started working for myself 4 years ago.
The only sealed system work I did before that for years was the warranty ones.

Offline Icehouse

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Re: Subzero Compressor Replacement, What Did I Do Wrong?
« Reply #5 on: September 02, 2012, 02:07:34 PM »
They may have a solenoid valve tied into the thermostat. Try jumping the thermostat out and see what happens. :)
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Offline Wedgeman55

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Re: Subzero Compressor Replacement, What Did I Do Wrong?
« Reply #6 on: September 02, 2012, 06:39:59 PM »
I did sealed system years ago -- too many to count.   I find I can make as much money doing several smaller repairs that don't take as much time.   And way too much possible aggrevation.   If you have problems,  your profit margin goes right down the tube.   We have several guys who do it in our area,   I just refer it to them.   If job goes bad,   you loose money + time.   High probability. 
     Hey Icebox,  remember the hot gas defrost?   I ran into an old refrigerator with one.   The coil wouldn't work,  I found someone in our area who has lots old parts that had one.    Was able to fix it.   Some of these young guys have never even seen one.     I'll tell you,   probably way more effective than the heaters in today's refrigerators.   Plus,  guy told me machine had never been serviced in 50+ years.    Amazing.     
Commercial Laundry repair Tech and Installer  1973 to 1980
Service Manager / Technician Commercial Laundry repair company 1980 to 2002
Refrigeration - HVAC - Boiler School 1974-1976
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Offline JWWebster

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Re: Subzero Compressor Replacement, What Did I Do Wrong?
« Reply #7 on: September 03, 2012, 10:23:10 AM »
Kinda makes you wonder why more of todays machines wouldnt have a hot gas solenoid with them fancy electronics. Using a low voltage coil instead of a heater would save even more power.
« Last Edit: September 03, 2012, 10:25:43 AM by JWWebster »
May the hinges of our friendship
        never grow rusty.

About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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