| 126 / | HD | STOVES AND FURNACES |
| 569 | DF | SOLAR HEAT COLLECTOR {18} |
| 572 | DF | .~ With control means energized in response to actuator stimulated by condition sensor {3} |
| 593 | | .~.~ Of collector {2} |
| 594 | DF | .~.~.~> Pressure responsive |
| 595 | DF | .~.~.~> Temperature responsive {4} |