| 165 / | HD | HEAT EXCHANGE |
| DIG 92 | DD | WITH VALVE OR MOVABLE DEFLECTOR FOR HEAT EXCHANGE FLUID FLOW {6} |
| DIG 109 | | .~ With by-pass of heat exchanger or heat exchanger section {2} |
| DIG 110 | DD | .~.~> Bypass within or surrounds heat exchanger {4} |
| DIG 120 | DD | .~.~> U or serpentine heat exchange flow path {2} |