165 / | HD | HEAT EXCHANGE |
200 | DF | WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14} |
201 | DF | .~ Having heating and cooling capability {13} |
231 | DF | .~.~ Congealed material (e.g., frost, etc.) or condensation removal or prevention {2} |
233 | .~.~.~ Operated by temperature sensor |