| 摘要 |
A room heating unit comprises a casing 1 fixed against a wall 3 and resting on the floor of the room. Within the casing 1 is an aluminium block heater 9 incorporating a spirally wound resistance heating element 11. When power is supplied to the heater 9 warm air is fed into the room through a grille 8 and cool air is drawn into the casing (for heating) through a lower grille 7. Several heaters 9 are independently connected to a microprocessor control unit which switches the heating units on in a predetermined sequence so that the instantaneous power consumption is low and the units can be supplied at low voltage. <IMAGE> |
