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08-10-2006, 07:42 PM #1
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I've put in a new compressor on a med temp temperture reach in cooler, and was wondering ,would a sight glass be accurate in this system,it has a cap tube for refrigerant control.
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08-10-2006, 07:44 PM #2
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no. charge the thing per the info plate..
Let's give nukes a chance.
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08-10-2006, 08:12 PM #3
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Nope
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08-10-2006, 08:12 PM #4
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That won't apply here.The unit uses a bunch of coiled tubing off the high side to evaporate the water in the evaporator drain pan,it was corroded and leaking so I replaced it by coiling my own tubing so the system capacity has changed ,what about a certain super heat or a 20 degree td in coil and box temperture? I don't know ,I don't get to work on a whole lot of refrigeration.
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08-10-2006, 08:19 PM #5
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A sight glass would be a waste of time and money on a cap system.
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08-10-2006, 08:20 PM #6
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ive done the same thing doOd, it'll be close..charge it 2-3 oz under and go from there..
Let's give nukes a chance.
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08-10-2006, 08:24 PM #7
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Charge it on superheat, it's the only way to get it right now.
A Diamond is just a piece of coal, that made good under pressure!
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08-10-2006, 08:40 PM #8
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I'm going to weigh the charge in as close as I can then check my superheat.But why won't a sight glass work? You wan't only liquid going into the cap tube,right?
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08-10-2006, 08:53 PM #9
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Weigh it in to get it close, get the box to temp and tweak it to about 10* superheat at temperature.
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08-10-2006, 09:07 PM #10
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if you want to put a sightglass on a system with a cap tube i suggest taking a black sharpie and inking out the glass except in the middle, now you have a MOISTURE indicator.
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08-10-2006, 09:08 PM #11
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sorry forgot, I would charge it by superheat as well.
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08-10-2006, 09:41 PM #12
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Also keep a eye on the high side when charging by superheat dont want it to go to high. If it does before the low side comes up then replace the cap-tube. I change the cap tube alot of times when I am replacing the compressor with out even knowing if it is restricted or not. Been disappointed more than once after changing a locked or burnt out compressor only to find out the cap tube is resticted too.
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08-11-2006, 03:12 PM #13
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Amen kbghdg, I do the same. I always change cap tube as well even if I don't know if it is restricted. I have been bit too many times from that. Change a compressor and drier on cap tube system and charge up (evacuating of course) only to find captube restricted or runs good for a day then goes bad because the last compressor was a burn-out and it kicked some insulatin (or whatever)around and now the customer thinks it should be a free call(this is warranty right?) CYA
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