| 摘要 |
<p>The device has valves (A18, A26) that are in open position during heating mode for circulating air towards top in an air space (07), descending the air in an air space (22) through an air space (19) and returning the air towards the space (07) through an air space (14). The valves are in open position and the air circulates in inverse direction in the air spaces during cooling mode. The valves are in closed position to block the entry of the air in the spaces (19, 22) during stop mode. Motors (M18, M19) have pistons (P20, P21) for activating the valves.</p> |
