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 | DF | .~.~ Of collector {2} |
595 | .~.~.~ Temperature responsive {4} | |
596 | DF | .~.~.~.~> Set point control |
597 | DF | .~.~.~.~> Differential temperature control |
598 | DF | .~.~.~.~> Freezing prevention |
599 | DF | .~.~.~.~> Overheating prevention |