Introduction: Repairing a Broken Refrigerant Line.

I have this spare ice maker that I gutted out to use the compressor as a diy chiller. Last night when I was carefully bending the copper tubing, one of them broke. Bummer! So much for copper.

I didn't want to throw away a perfectly good compressor so with some spare parts lying around I went about repairing the broken line. This fix was unbelievably easy and if you have the same tools as I do, then for sure you can fix a broken line and even replace a busted compressor.

As always safety first. Wear eye protection and protect sensitive parts from hot materials. Also no debris must enter the open copper tubing.

Step 1: Adding a Valve to the Vacuum and Fill Line.

Newer refrigerators come with Schrader valves but this tiny unit just had its line crimped and brazed. I had an old brass valve so I went ahead and soldered this onto the line after cutting off the end. I used normal electronics grade solder to make an air tight seal between the line and valve.

Step 2: Joining the Busted Lines.

Using my tool set for air conditioning, I cut a length of spare tubing and expanded it. I basically used it as a splice and soldered the whole thing together.

Step 3: Sealing a Cut Off Line.

Using a small piece of tubing to make a crimp onto this line I filled it with solder and sealed off this unused line.

Step 4: Pulling a Vacuum.

With my Manifold gauge set and vacuum pump hooked into the installed valve, pulled a vacuum for 20 minutes and locked off the manifold low pressure valve then turned off the vacuum pump. I let it sit like that for 15 minutes watching for any decrease in vacuum. Satisfied there are no leaks I went ahead to the next step.

Step 5: Adding R134a Refrigerant.

I had a spare bottle left over from car work I did so I put a little into the vacuumed system. I estimate that about 1oz I needed for such a tiny system but I have no scale so I added tiny volumes and watch the low pressure gauge.

Once I was satisfied enough was in the system I proceeded to power up.

Step 6: Testing!

It powered up successfully and the compressor hummed like a dream. I measured the power consumption and opened the can valve to let some more refrigerant in. Once the power consumption reached 69 watts I locked off the can valve. After 15mins and it used approximately 64watts. The low pressure gauge read -4.5 inHg. I let her run while taking a temperature reading.

Below 10C is quite good! I'm very happy here.

Step 7: Practical Application Testing.

The portable thermometer showed down to 4C with a power draw of 65watts. The bottle of water force over after approximately 45mins.

My Handy thermal camera shows a case temperature of 65C which is very good!

Basically anytime I need to refill one of these tiny r134a compressors I only need to make sure the power draw is 65watt and the case temperature is 65C after about one hour of operation. Also the fill line must read -4.5 inHg.

I'm elated at my very first diy fix for a busted hermetically sealed refrigeration system. The system works excellent and there are no detectable leaks. I plan to use this to freeze a 400 gallon tank of water to store solar energy. At night I will pump this cold water into the house to cool a room! I will keep you folks informed of my progress.

Comments

author
padakick (author)2016-04-05

Hi, did you try to cool your home with this. how did you come about doing this. I would try cooling the mattress ;-)

author
Mjtrinihobby (author)padakick2016-04-05

Haha. Probably the mattress would be the easiest. Right now I'm testing part of the revised system. Hopefully in 2 weeks I can experiment with a room.

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