| 165 / | HD | HEAT EXCHANGE |
| 200 | DF | WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14} |
| 201 | DF | .~ Having heating and cooling capability {13} |
| 205 | DF | .~.~ Plural temperature regulators for plural zones {8} |
| 212 | DF | .~.~.~ Central temperature conditioned air supplied to each zone {4} |
| 215 | ![]() | .~.~.~.~ Reheat adjacent zone air inlet |