I think the compressor is short cycling

[SquareTopCollector]

I have a css-8-64 caliver machine that will chill but the compressor will turn on every 5-10 min. I have a few other working uss-8-64's and css-8-64's and their compressors do not come on as often. Could this be due to a bad thermostat or is it low on freon?

I used a temp probe and the machine chills to 30 degrees

Thanks

[johnieG]

I'd say if the evaportator fan's blowing air, it's the most likely suspect. also an empty machine will cycle more frequentlty than a fully loaded machine, but yours sounds like a bad thermostat to me.

[SquareTopCollector]

Compressor is on until machine hits 32 degrees and it turns back on at 36 degrees. I am looking for possible leaks in the insulation

[johnieG]

Check to make sure the bottle door is sealing correctly against it's gasket, if you can here the evap' fan running loudly (when the compressor is off) try pushing the door shut with your hand, if the noise greatly decreases, then you can try to adjust the door hinge screws by loosening then & adjusting the door so it sits "squarely" against the gasket, the door tend to get a lot of abuse & can be out of alignment , ( the hinge side will contact the gasket first & hold the door-handle side open allowing warm air to constantly "leak" into the cabinet.

another quick check is to put a work light inside the cabinet, close the main door, dim the room lights & see if the main door is sealing all the way around the perimeter of the chassis/frame ( pass the ligths cord through the bottle door so you don't affect the main doors gasket seal ie; cause a gap with the line cord of the test light)

If there is a gap, try adjusting the door latches striker plate so it "pulls" the door snugger against the frame, butif you set it to tight, you'll need a large gorila to close the latch!

hope these suggestions help narrow down you problem.

[BryanH]

Is the machine empty or loaded.  If its empty try putting some bottles in it.

[globalcompressors]

Every 10-15 minutes, on an empty machine is about par.
I noticed your other post, about frost, on the other thread...Frost is normal when the machine has reached temperature and you simply opened the main door.

If you have a heavy build up, you may want to run the box a bit warmer, and like jonnie said above, check the door gaskets...both of them.

Worst case, buy a new thermostat.  


When you're checking temperature, and want to
check cycle times, leave the door closed for several hours while running the machine. Only look through the glass at the thermometer...do not open the machine, you'll throw off the timing and won't get an accurate count.

Remember....several hours!


Eric

[SquareTopCollector]

I filled the machine with water bottles and now the compressor is turning on less often. Now I am concerned about the uss-8-64 because the coils on the evaporator are forming thick amounts of frost on them.  What do I need to do to correct it? I can post photos this afternoon

[BryanH]

Is the cooling area sealed properly?  If your seals aren't tight then air and moisture get inside, condense and freeze on the coils.  JohnieG's suggestions above can help find a bad seal.

[MoonDawg]

(SquareTopCollector @ Apr. 23 2007,6:15)

QUOTE

the coils on the evaporator are forming thick amounts of frost on them.  

This happens when the evaporator fan is not pushing air through the coils. Is the fan working?

[SquareTopCollector]

fan is running and I did the light test. I had to adjust the cabinet door since it was leaning. I will let it set over night and see if there is a difference tomorrow morning. Thanks guys