Split system subcooling charge check

Required liquid pressure for 4TTR7024A, 4TTR7036A, 4TTR7048A, 4TTX8036A, 4TWR6042H and 4A6H6036E: design subcooling plus each model's line length and lift correction, add or recover verdict, tubing-table weigh-in and the 4A6H6 below-55 °F rule.