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Post by vintageguy on Jun 20, 2015 3:27:38 GMT
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Post by coldspaces on Jun 20, 2015 3:53:38 GMT
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 20, 2015 4:12:54 GMT
Edit Thanks for the links, didn't see them before posting. I've been scouring the net without much luck, and nothing in the few refrigeration books I have. Did find this manual which might have some answers, not at all cheap though. www.abebooks.com/servlet/BookDetailsPL?bi=7232799151&searchurl=kn%3Dschaefer+refrigeration%26sts%3Dt%26sortby%3D17Next week I'll look for a copy and if any other useful manuals or parts list can be found through the library (my wife is a great reference librarian). I've read some of the manuals and info on the new digital freezer controls, seems they're very adaptable. Is there a way to find out by running it and taking measurements what the differential should be? I think that is the only unknown, and pick what temperature you want.
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Post by vintageguy on Jun 20, 2015 4:39:23 GMT
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Post by coldspaces on Jun 20, 2015 13:32:07 GMT
$299 for an old service manual is way out of line. I would never pay that much especially if it does not cover your model #.
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 20, 2015 13:56:05 GMT
I agree, I certainly won't be buying it and doubt anyone else would either. But knowing such a manual existed gives me something to search for. Might be worth asking the seller which models it does cover, and if it has part numbers, I may learn something yet.
Grigg
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 23, 2015 15:34:08 GMT
OK, I'm still researching but I've also purchased a new digital programmable control as well. I looked at Nelson Freezers who were making ice cream freezers even before the Schaefer unit I have was made, and they're still making them. They have a similar sized model and it uses a Carel digital control and use the same brand on most of their other units. The link above is for Item # PJEZSNH100, Easy Compact This is the instruction manual www.tempatron.co.uk/resources/product/manual_79.pdfThis model is not the most fancy and also not the most basic. It does however have only one relay for the compressor, other models have more relays for condenser fan and other functions. My unit does not have a fan so the cheaper control is OK, total $75 with the temperature probe. They were also very helpful on the phone, seem like they're nice to deal with so far and offered any help I may need on programming the control. looks like it is only 3 wires and two more for the probe, nothing tricky there it just needs 110V all the time. The temperature range is adjustable as well as the differential. It has lots of features like defrost, alarms and such that I don't see using. For whatever logical or illogical reason I wanted a digital temperature control from the start and now with the trouble identifying and matching the original it actually seems like a good choice. It can be configured to match any old mechanical control and then some. I'm still digging for old literature, will update if I find anything. Still looking for the terminal cover, unfortunately I missed a chance at one so the search continues. Quick question on the inside of the cabinet, it is galvanized and has a very small pin hole in the bottom corner. Should I try to solder it, seal it with something, any advise or ideas there? Thanks, Grigg
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 25, 2015 14:09:17 GMT
There is an access cover on the bottom of the case, here is a picture from the bottom looking up. It had some old fiberglass insulation stuffed in there. Is there a better replacement or just use more of the same? Compressor wiring looks like this, I was checking it over and plan to replace the wires, make it a little cleaner looking. Does that all look normal? As for color codes I looked in the Audels Refrigeration guide and there is some variation but seems common enough to have Black-Common, White-Start, and Red-Run. Yesterday I made up a little stainless plate to slide the new control into when it arrives, left the old tag in place. Curious how the power cord and initial wiring would have been done when new? More recently someone added a little junction box which I'll either move more out of the way or remove. Anyone have a picture of what the terminal cover should look like, that will help in my search for one? Thanks, Grigg
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Post by coldspaces on Jun 25, 2015 17:03:26 GMT
It looks to be wired right best I can tell without a relay like that in front of me. Here are a few pics of that type cover.
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 25, 2015 17:14:03 GMT
Excellent, Thanks for the pictures. I found this advice and method of checking total run time in an old Audels manual, might be useful to someone else too.
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 27, 2015 3:46:33 GMT
Installed the new control, quite easy, easy to wire too. It was pre set for a 1° differential, would switch on and off every couple minutes. I just opened up to 10° differential and will check on it in the morning. Its been running now mostly on and some off for 1:40 total so far. The compressor is pretty warm, almost more than you want to keep your hand on. Not sure if that is normal being as it just pulled down from 75° to -5 or is it something to worry about? I set a box fan to blow on it for now, and the wider differential will give more off time too. I expect it'll be happier with something in the box to freeze and moderate the cabinet temperature too.
I'll play with it some more tomorrow.
Grigg
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Post by coldspaces on Jun 27, 2015 4:31:56 GMT
10° diff. should be pretty good. Could have been as much as 16° diff. on some freezers.
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 28, 2015 20:07:50 GMT
It ran about half on and half off, every 6 minutes or so, empty box and without cover on the bottom. Today I cleaned up that cover, put some new Fiberglas insulation in there and some foam tape on the edges. Also soldered over the small rust hole in the bottom of the liner. Now its running again with two gallons of water inside to freeze. I have the clock hooked up with the motor to monitor run time. Still have a fan blowing across the condenser and compressor for now, then I don't worry about the compressor getting to hot. I'll check with an IR thermometer tomorrow.
I don't have the equipment but should I check pressures or anything to do with the refrigerant/compressor?
Is it safe to assume that the average temperature is not the set point on the control but that plus half the differential? It is set at -5°, cuts on there and off at +5°, average of 0°?
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 30, 2015 1:01:08 GMT
Today it has run about 1/3 on and 2/3 of the time off. I have a few pictures to post tomorrow of the new control and such.
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Grigg
5 Cubic Foot
Posts: 95
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Post by Grigg on Jun 30, 2015 13:13:50 GMT
Over 24 hours yesterday it ran 37.5% of the time from -5 to +5. Seems to be improving a little. Today I bumped it down to -10 and it'll cut on at 0. I may need to adjust the offset so the control displays or averages actual temperature in the box. Today I'll pickup a large cooler full of ice (for the upcoming weekend of ice cream making) and put all I can fit in the freezer, I think that will help the run times a fair amount. Here are a few pictures of the new stuff. The sensor came with a piece of TIG welding wire taped to it and the instructions I got over the phone last week were to bend it somehow (a little unclear) and even use a clip of some sort to doubly secure it in place. I figured out how long and bent it like this, it is sort of spring loaded and should keep it's self wedged in the tube. Then used some 3M strip caulk to cover it over and seal the end of the tube. The wiring I was able to eliminate the little junction box the last owner added and instead I used some cable clamps to hold the cord and the line going to compressor. The one junction was made in the terminal block that plugs in back of the controller. The white wires are joined which I figured out after this picture and before I messed anything up, small brain fart... And finally running, displaying cabinet/room temperature at this point. Yesterday a NOS Klixon starter relay came from ebay, just a spare because it seemed a good thing to have on hand and perhaps not easy to find when I might need one otherwise. Interestingly enough it was made in Attleboro, MA the same as my wife was, neither are still in Attelboro though. With it came some little jumper wires that I'll use on the compressor in place of the previous owner's long ones with plenty of electrical tape.
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