Had no problems until i adjusted the temperature to ferment a lager beer at 45 degrees. adjusted to near 50 degrees for a few weeks and now the unit will not cool less than 50. the coils were really dirty so i cleaned them and still no change. if i turn the thermostat to off the compressor turns off. the fan works fine. its an older unit, the date on the compressor is 1993. i dont usually mess with the thermostat and i wonder if this is the problem or if i need to have the freon recharged. any help would be great because there's beer at stake here. many thanks.
Seems like the T-stat may have a dead spot on it since it started when you changed the settings. It is possible to trick (short) the t-stat to cause it to cool FOREVER, that would check your refrigerant charge is good. Would lean more toward t-stat problem first.
Check the seal on door, make sure its sealing properly, if yes check coils internal & external, make sure they're clean, check freon level as a last result
SOURCE: I have a Beverage Air
You'll need to check the back-pressure on the low-side of the system, you have a faulty compressor. If there is a condenser fan motor make sure it is running when the compressor is on.
If you are
making your own Ale, then around 65-70 degrees F is a good temperature. Largers ferment better around 50 degreees
Be careful because if you ferment your beer too warm it could have an unpleasant flavor. And if you make the temperature too cold, the yeast might stop working. So it's hard to get the balance right but experience helps.
a 5 gallon batch of beer will produce around 3 degrees Fahrenheit of heat
during the fermentation.
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