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Post by coldspaces on Oct 15, 2015 2:36:43 GMT
Well I made back to Travis's and picked up this Coldspot. Cabinet is in nice shape and all the shelves are present and accounted for. Doesn't cool and the expansion valve was believed to be at fault. Even got to meet Garrett (2030vision). Wasn't much time to get to know each other but was great to put a face with the name.  Here I have the valve removed and was planning to try to disassemble it and check the needle and seat.  Strainer was far from pluged but did have some crud in it.  Everything on this valve was soldered to hermetically seal it for so2. The copper fittings came out no problem but when I tried to remove the bottom cap  Well lets just say it didn't go well. That cap would not budge even with the solder melted. Finally broke it off. Even with most of it removed I had no luck at all trying to disassemble it the rest of the way. Looks like this valve is done for. Have a TXV on the way that I will be installing on it. And we are going to see if this machine will work with R134A in the near future.  |
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Post by coldspaces on Oct 27, 2015 4:01:58 GMT
Got the TXV installed on this Coldspot and as you can see added a drier and a sight glass. Only the txv will show much when someone looks inside the cabinet. I plan to paint it and the lines all silver so they blend. Travis was right that the shaft seal still holds on this unit. Pulled a great vacuum and charged her up with 134a. I did not add a suction line restrictor so far. Thought I might have too but so far it is doing great without it. Watts do reach close to full load (420 watts is max)during pull down for a short time after that they dropped to about 350 watts. Looks like it is going to have some pretty good run times but it hasn't even pulled the cabinet down the first time yet. And it runs pretty quite, much better than a belt drive would be. I like it!   |
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Post by allan on Oct 27, 2015 14:32:42 GMT
Neat machine! Please show off the compressor What horsepower motor is it? Keep an eye on compressor oil level. If suction tank isn't full of liquid refrigerant then it will fill up with oil. I am excited to see your pressures and cycle times to compare with the Crosley. Good work.
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Post by allan on Oct 27, 2015 17:24:37 GMT
Couldn't tell from pic but did original txv have a feeler bulb?
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Post by coldspaces on Oct 27, 2015 21:57:45 GMT
Couldn't tell from pic but did original txv have a feeler bulb? No it was an automatic valve. |
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Post by coldspaces on Oct 27, 2015 22:07:20 GMT
Neat machine! Please show off the compressor What horsepower motor is it? Keep an eye on compressor oil level. If suction tank isn't full of liquid refrigerant then it will fill up with oil. I am excited to see your pressures and cycle times to compare with the Crosley. Good work. From what I read the tank is just a separator to keep drops of liquid from getting to the compressor. Works like a suction accumulator. I don't think it should be full of liquid refrigerant. Will Try to get the pics later tonight, right now the wife ride needs a blend air motor replaced. |
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Post by allan on Oct 27, 2015 23:03:23 GMT
Maybe that one has some type of wick for oil return. I remember seeing that in some of the old books. Your accumulator would not be able to return oil like a modern refrigerant accumulator, via a bottom located orfice. Very exciting.
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Post by coldspaces on Oct 27, 2015 23:05:40 GMT
Here is a real nice view of the refrigerant and oil circuits I found on a earlier model. And some of the internals.  
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Post by coldspaces on Oct 27, 2015 23:22:36 GMT
Here is instructions on lapping in a shaft seal. Looks like a person could save a few old ones and make them seal again. Might have to make a tool or two first. babel.hathitrust.org/cgi/pt?id=wu.89078537636;view=1up;seq=204;size=125
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Post by allan on Oct 28, 2015 2:29:43 GMT
Wow that has a separate oil cooler circuit, never ever seen that on anything refrigeration! And it appears that the system has a large liquid receiver. I would assume by that picture that the Evap and suction tank is intended to be flooded. Maybe that design , with the separate oil cooler doesn't circulate very much oil. Would surely be more efficient.
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Post by coldspaces on Oct 28, 2015 2:41:04 GMT
Wow that has a separate oil cooler circuit, never ever seen that on anything refrigeration! And it appears that the system has a large liquid receiver. I would assume by that picture that the Evap and suction tank is intended to be flooded. Maybe that design , with the separate oil cooler doesn't circulate very much oil. Would surely be more efficient. Mine is not the same as shown. Smaller vertical receiver. And they were a dry system with the automatic expansion valve. Also called a constant pressure valve. And they were designed to push the oil through the cooler and back to the compressor by pressure. Early ones had the oil cooler in the condenser. Mine has a curled tube fasten to the base under the compressor. I will get a pic if possible of it. It's a 1/5 hp at 1725 rpm amp 3.5 amp    |
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Post by coldspaces on Oct 28, 2015 3:01:20 GMT
Wow that has a separate oil cooler circuit, never ever seen that on anything refrigeration! And it appears that the system has a large liquid receiver. I would assume by that picture that the Evap and suction tank is intended to be flooded. Maybe that design , with the separate oil cooler doesn't circulate very much oil. Would surely be more efficient. Travis's Majestic has a separate oil cooler circuit in the condenser coil also. |
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Post by coldspaces on Oct 28, 2015 3:20:19 GMT
After running all night and only opening the door once this morning I checked it at lunch and found it kicked on and ran for 1 minute and 41 seconds. Stayed off for 12 minutes 17 seconds. Temp was about 34F in middle of box and 64 F in the garage. Tonight it was still running about 1 minute 40 seconds on and around 11 1/2 minutes off. garage was 67F and box just under 32 at the end of cycle. Suction pressure was 8-9 psi(3-5F for 134a) at shut down. Looks like many similar Coldspots were set to hold a vacuum with so2 equivalent to 4-7F so it running pretty close it would look like. It does get pretty cold at the suction line , by the end of the cycle there is very little supper heat just before the heat exchanger(Note the Small bead probe at frosted line in pic). Looks like I may want to try adjusting the new valve a little and see what happens.  Here you can see part of the approximately 12' of tube coiled up to form the oil cooler.  |
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Post by allan on Oct 28, 2015 3:32:55 GMT
Wow that has a separate oil cooler circuit, never ever seen that on anything refrigeration! And it appears that the system has a large liquid receiver. I would assume by that picture that the Evap and suction tank is intended to be flooded. Maybe that design , with the separate oil cooler doesn't circulate very much oil. Would surely be more efficient. Mine is not the same as shown. Smaller vertical receiver. And they were a dry system with the automatic expansion valve. Also called a constant pressure valve. And they were designed to push the oil through the cooler and back to the compressor by pressure. Early ones had the oil cooler in the condenser. Mine has a curled tube fasten to the base under the compressor. I will get a pic if possible of it. It's a 1/5 hp at 1725 rpm amp 3.5 amp Isn't there one pass of the oil cooler in the bottom of the condenser coil? How does it sound running? Is there any vibration in the compressor? |
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Post by coldspaces on Oct 28, 2015 5:00:06 GMT
Here is a video, runs real smooth nowhere near as loud as the camera makes it sound. Watts are good at 320, about 76% of full load on the motor. Not bad at all. youtu.be/bbpJkb3o-2A |
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