| 165 / | HD | HEAT EXCHANGE |
| FOR 104 | DF | AUTOMATIC CONTROL (165/13) {2} |
| FOR 123 | DF | .~ Temperature or pressure (165/32) {4} |
| FOR 125 | DF | .~.~ Branched flow of exchanging fluid (165/34) {1} |
| FOR 126 | DF | .~.~.~ By-pass of heat exchanger (165/35) {2} |
| FOR 129 | | .~.~.~.~ Pressure controlled (165/38) |