PURPOSE: To prevent cold draft by controlling the amount of air blown out of an indoor unit during heating retrigerant in connection with a relay or the like controlling fuel supply to a heat source for heating a heating agent in a refrigerant heating device.
CONSTITUTION: A control circuit consists of a relay or the like 13 for a fam motor which controls the speed of the motor 12 for the blower stepwise or steplessly in connection with a relay or a valve mechanism controlling fuel supply. When controlling heating operation using a refrigerant heater 6, the motor 12 for blower located in the indoor unit A is operated as follows: When the fuel supply control relay 10 supplies fuel, the motor 12 is turned at a preset speed, while when the relay does not supply fuel, the speed of the motor 12 is decreased stepwise or steplessly.
TAGUCHI AKIRA
MORI YUUJI
OOSHIRO SHIGERU
