The C-305-S features ODF solder (sweat) connections

an "OL" reading indicates an open circuit

you can swap this replacement TXV power head by removing the two included capscrews

featuring reinforced end caps to handle temperature cycles

Calibration is performed by adjusting the zero and span settings to ensure the 3-15 psig output aligns precisely with the 50-150°F scale using a precise pressure gauge and a known temperature reference

Trane COM6438 Compressor 320788-704 The C-305-S features ODF solderEngineered for high capacity commercial climate control, the Trane COM6438 is a durable 15 ton scroll compressor designed to maintain peak performance in demanding 460V 3 phase environments. Delivering a robust 180,000 BTU H cooling capacity, this workhorse is the standard for large scale rooftop units and industrial chillers. Utilizing a hermetically sealed scroll design, it provides superior efficiency and quieter operation compared to reciprocating