The end result is this. ALL those times short and long you ran off level cause extremely small (unless it is 24 hour or more) blockages. You never notice it because the affect is not felt until years down the line. Then one day, it is hot and your refer just seems to NOT cool that well. Then you blame the refer. Others also, if you post on a forum. Remember, in Transit, all those times you stopped overnight or for sightseeing or lunch and the refer was OFF Level, even for 15 minutes, that causes a blockage, like Heart Disease, it finally causes a major problem. The reason I stated 24 hours is to get the refer to STOP percolating and allow the Ammonia to return to its cooled normal state. You did do some harm but you want to minimize it. LP or 120 it makes no difference on unlevel operation. Doug