165 / | HD | HEAT EXCHANGE |
200 | DF | WITH TIMER, PROGRAMMER, TIME DELAY, OR CONDITION RESPONSIVE CONTROL {14} |
201 | DF | .~ Having heating and cooling capability {13} |
244 | DF | .~.~ Means to control fan or pump to regulate supply air flow or supply water flow {3} |
245 | .~.~.~ Low flow during heating and high flow during cooling |