I have an RTHD under contract , about five years old . Machine has shut down on loss of oil pressure twice . On the initial alarm I added two gallons of oil . Two weeks later another alarm .
The machine opperates at approximatly 60 to 70 % demand this time of year . Oil pressure drop across the oil filter is approximately 5 psig or less . Oil pressure is approx 119 psig . Oil heaters working . Condensor tubes clean . Leak checked , and charge recently weighed back due to a previous leak . Oil return gas pump is cycling normaly .
I have recently observed the liquid level sensor fluctuate between 2 and -2 causing the approach to increase and decrease by 3.5 F , the expansion valves appear to be opperating well . If my refrigerant level is not consistant would this not cause poor oil return and thus cause my oil reservoir sensor to go " dry " causing the machine to trip on loss of oil ?. I believe the replacement liquid level sensor is of new design , perhaps for a reason such as this one ? .
Your thoughts on this would be greatly appreciated .