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Post by stoveguy on Aug 23, 2020 0:39:18 GMT
I have a CA unit that has sat for years. Rewired it and it starts/runs/ cools. The chiller/ evaporator does get to 25 degrees, but it takes all day to get there. Any idea why this unit seems to be a bit "bunk" on it cooling speed? I have had other CA units where the evap goes right down to just above zero and shuts down in short order. Whats going on here? Any help is much appreciated.
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Post by ChrisJ on Aug 23, 2020 1:34:39 GMT
I have a CA unit that has sat for years. Rewired it and it starts/runs/ cools. The chiller/ evaporator does get to 25 degrees, but it takes all day to get there. Any idea why this unit seems to be a bit "bunk" on it cooling speed? I have had other CA units where the evap goes right down to just above zero and shuts down in short order. Whats going on here? Any help is much appreciated. Worn float valve. Does the evaporator seem very loud as well? |
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Post by cablehack on Aug 24, 2020 0:29:53 GMT
The bottom centre of the evaporator should get down to less than 8.5 degrees F. 25 degrees certainly puts suspicion on the float valve - and this is not uncommon with CA units.
If the float valve is worn, the pressure difference between low and high sides is inadequate, and cooling ability is reduced. Two options are to install a capillary tube, or rebuild the float valve.
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Post by brandon on Aug 27, 2020 11:47:35 GMT
yes, so the cap tube conversion is the fix?
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Post by cablehack on Aug 27, 2020 23:55:11 GMT
yes, so the cap tube conversion is the fix? I've been running both my CA's with cap tubes since 2013 and they work great. The float valve in the CA-2 kept blocking up from other contamination, although it was OK otherwise. The CA-1 had external damage to its float valve, and was visibly worn when I opened it up anyway. Performance with the cap tube is as good as the specs quoted in the manual. |
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Post by ChrisJ on Aug 28, 2020 1:55:12 GMT
yes, so the cap tube conversion is the fix? I've been running both my CA's with cap tubes since 2013 and they work great. The cap tube in the CA-2 kept blocking up from other contamination, although it was OK otherwise. The CA-1 had external damage to its float valve, and was visibly worn when I opened it up anyway. Performance with the cap tube is as good as the specs quoted in the manual. I'm kinda wondering if mine is suffering from a little cholesterol issues. |
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Post by cablehack on Aug 28, 2020 22:40:03 GMT
I've been running both my CA's with cap tubes since 2013 and they work great. The cap tube in the CA-2 kept blocking up from other contamination, although it was OK otherwise. The CA-1 had external damage to its float valve, and was visibly worn when I opened it up anyway. Performance with the cap tube is as good as the specs quoted in the manual. I'm kinda wondering if mine is suffering from a little cholesterol issues. If you mean there might be a blockage somewhere, I'd expect a marked change in its cooling performance which would show up with the cycling times. |
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Post by ChrisJ on Aug 29, 2020 1:51:28 GMT
I'm kinda wondering if mine is suffering from a little cholesterol issues. If you mean there might be a blockage somewhere, I'd expect a marked change in its cooling performance which would show up with the cycling times. After bleeding it's cycle times and power consumption are back to normal but it's still talking.  |
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Post by cablehack on Aug 29, 2020 12:28:02 GMT
If you mean there might be a blockage somewhere, I'd expect a marked change in its cooling performance which would show up with the cycling times. After bleeding it's cycle times and power consumption are back to normal but it's still talking. It must be one of those unique CA quirks. My CA-1 had a slight but constant rattle for the first few years I had it in operation. Then, after one of the 12-18 month purges it was gone and has never returned. After the last purge I did a few months ago, a constant boiling of methyl formate in the compressor can be heard throughout the entire off cycle. I just put it down to the "unstable" refrigerant, but the actual fridge performance with cooling ability and cycling times remains perfect, so I don't worry about it. |
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