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Metalworking (rec.crafts.metalworking) Discuss various aspects of working with metal, such as machining, welding, metal joining, screwing, casting, hardening/tempering, blacksmithing/forging, spinning and hammer work, sheet metal work. |
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#1
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charge chest freezer
I'd ask over on the HVAC forum, but I got my head bit off last time.
We have a 21 cuft commercial chest freezer. Quit working. My neighbor was over last night and put on a pierce style fill fitting and put in a couple oz R134a. Got -27 deg F this morning. So, all unit needs is a bit of refrigerant. Pressure reading on low side is -15 in HG. Any educated guess on what low side pressure i should fill to? Second question, my neigbor said R134a is a blended refrigerant so you need to have can upside down to put in liquid. This can be a problem slugging a small system. On all my R12 and R22 systems I've just let the compressor suck in vapor off the top. Is it really necessary to have can upside down? |
#2
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charge chest freezer
Karl Townsend fired this volley in
: my neigbor said R134a is a blended refrigerant so you need to have can upside down to put in liquid. That part isn't true for 134A. Many manufacturers recommend charging gas rather than liquid, even on systems requiring much less total charge than the capacity of the dispensing container. He might have confused 'lube cans' containing both refrigerant and compressor oil. Also, Karl, almost all refrigerators and freezers specify ONLY charging on the high-side, while the compressor is OFF. That often requires warming the can -- up to 120F. Charges are typically small. An 18cu.ft. combo might take only 6-8oz total charge. If you cannot observe the frosting of the coils, it makes more sense to 'recover' the old charge, and use weigh-charging to get it right. Lloyd |
#3
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charge chest freezer
On Wed, 03 Jun 2015 06:05:06 -0500, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote: Karl Townsend fired this volley in : my neigbor said R134a is a blended refrigerant so you need to have can upside down to put in liquid. That part isn't true for 134A. Many manufacturers recommend charging gas rather than liquid, even on systems requiring much less total charge than the capacity of the dispensing container. He might have confused 'lube cans' containing both refrigerant and compressor oil. Also, Karl, almost all refrigerators and freezers specify ONLY charging on the high-side, while the compressor is OFF. That often requires warming the can -- up to 120F. Charges are typically small. An 18cu.ft. combo might take only 6-8oz total charge. If you cannot observe the frosting of the coils, it makes more sense to 'recover' the old charge, and use weigh-charging to get it right. Lloyd Thanks for the reply. Good to know I can charge conventionally. I'm sure you're right for new installs. I don't own the equipment to do recover/weigh/recharge. I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. |
#4
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charge chest freezer
Karl Townsend fired this volley in
: I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. ??? Why not find the leak, and repair it? Lloyd |
#5
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charge chest freezer
I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. ??? Why not find the leak, and repair it? Lloyd This work above my pay grade. If the unit leaks too much, toss it and buy a new one. |
#6
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charge chest freezer
On Wednesday, June 3, 2015 at 7:52:46 AM UTC-4, Karl Townsend wrote:
I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. ??? Why not find the leak, and repair it? Lloyd This work above my pay grade. If the unit leaks too much, toss it and buy a new one. For $18 and a few minutes' work, you could find your leak and save yourself the trouble of future refills. http://goo.gl/dQnN6s |
#7
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charge chest freezer
On Wed, 03 Jun 2015 06:52:45 -0500, Karl Townsend
wrote: I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. ??? Why not find the leak, and repair it? Lloyd This work above my pay grade. If the unit leaks too much, toss it and buy a new one. That's the way I figured with my 23 year old A/C system - why bother finding the first leak? --- Gerry :-)} London,Canada |
#8
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charge chest freezer
On Wed, 03 Jun 2015 06:32:22 -0500, Karl Townsend
wrote: On Wed, 03 Jun 2015 06:05:06 -0500, "Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote: Karl Townsend fired this volley in m: my neigbor said R134a is a blended refrigerant so you need to have can upside down to put in liquid. That part isn't true for 134A. Many manufacturers recommend charging gas rather than liquid, even on systems requiring much less total charge than the capacity of the dispensing container. He might have confused 'lube cans' containing both refrigerant and compressor oil. Also, Karl, almost all refrigerators and freezers specify ONLY charging on the high-side, while the compressor is OFF. That often requires warming the can -- up to 120F. Charges are typically small. An 18cu.ft. combo might take only 6-8oz total charge. If you cannot observe the frosting of the coils, it makes more sense to 'recover' the old charge, and use weigh-charging to get it right. Lloyd Thanks for the reply. Good to know I can charge conventionally. I'm sure you're right for new installs. I don't own the equipment to do recover/weigh/recharge. I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. If it leaks, find the leak and fix it , or replace it. It is ilegal to charge a system without testing it and repairing any leaks. |
#9
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charge chest freezer
On Wed, 3 Jun 2015 05:08:33 -0700 (PDT), rangerssuck
wrote: On Wednesday, June 3, 2015 at 7:52:46 AM UTC-4, Karl Townsend wrote: I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. ??? Why not find the leak, and repair it? Lloyd This work above my pay grade. If the unit leaks too much, toss it and buy a new one. For $18 and a few minutes' work, you could find your leak and save yourself the trouble of future refills. http://goo.gl/dQnN6s And for a few more bucks you can put in a sealer and fix the leak (better than 50-50 chance of the sealer working - but don't expect to discharge and recharge in the future - it's a "last ditch" attempt. If it doesn't last, you ditch it. |
#12
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charge chest freezer
On Wednesday, June 3, 2015 at 10:32:09 PM UTC-4, Larry Jaques wrote:
On Wed, 03 Jun 2015 20:51:49 -0400, wrote: On Wed, 3 Jun 2015 05:08:33 -0700 (PDT), rangerssuck wrote: On Wednesday, June 3, 2015 at 7:52:46 AM UTC-4, Karl Townsend wrote: I now have a system that leaks. Need to check with it running to a set pressure number and see how much add to get back to there on a regular basis. ??? Why not find the leak, and repair it? Lloyd This work above my pay grade. If the unit leaks too much, toss it and buy a new one. For $18 and a few minutes' work, you could find your leak and save yourself the trouble of future refills. http://goo.gl/dQnN6s Those usually don't work -after- all the magic coolant has leaked out. And for a few more bucks you can put in a sealer and fix the leak (better than 50-50 chance of the sealer working - but don't expect to discharge and recharge in the future - it's a "last ditch" attempt. If it doesn't last, you ditch it. That's (usually) only good if the compressor hasn't been damaged by loss of coolant and oil, when you catch it on the way down rather than after it's blowing warm. But it's a chance. When mine truly goes TU (I replaced the start/run cap a few years ago), I'll replace it with whatever system + new refrigerant they use. Mine's an old R22 system and will have to be completely swapped out. ChaCHING! -- It takes as much energy to wish as to plan. --Eleanor Roosevelt I'm no expert, but I think you can just add NU22 to an R22 system without swapping out all the hardware or even doing a purge. |
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