Patent ID: 8001797
Filing Date: 2011-08-23
Classification: F25B

Abstract:
1. A monitor and alarm system for an air conditioning unit having a suction refrigerant line and a liquid refrigerant line, comprising: a) a low pressure sensor mounted on the suction refrigerant line; b) a mid/low pressure sensor mounted on the suction refrigerant line; c) a high pressure sensor mounted on the liquid refrigerant line; d) a 12-volt back-up battery; e) a 110 V AC to 16 V AC transformer; f) a 16 V AC to 12 V DC converter board having three connection points; g) a double pole double throw (DPDT) relay; h) a terminal board having a plurality of terminals for connection to the converter board and the relay, and to a warning device and to the pressure sensors on the suction and liquid refrigerant lines; and i) wherein the back-up battery, transformer, converter board, relays and terminal board are located within an enclosure,