Warm air furnace

Abstract

A warm air furnace prevents household articles from freezing in the case where combustion is discontinued due to lack of gas during combustion operation when a house is emptied. The warm air furnace is equipped with a retry operation controller 33 which carries out ignition action of a combustor 5 , in the case where a predetermined period of time lapsed from the time it is determined that combustion at the combustor 5 is discontinued during combustion operation by a combustion operation controller which controls operation of the combustor, determines whether or not combustion at the combustor 5 is started, and repeats the ignition action for igniting the combustor 5 until it is determined that combustion at the combustor 5 is started, in the case where a predetermined time lapsed from the time it is determined that the combustion at the combustor 5 is not started.

1 . A warm air furnace which carries out an ignition action again in the case where combustion discontinues due to lack of fuel gas during combustion operation, comprising:
 an air intake which takes in air;   a combustor which is supplied with air taken in by the air intake and the fuel gas, and which combusts the same;   an exhauster which exhausts a combustion gas combusted at the combustor to outdoors;   a heat exchanger which is provided at the exhauster and which is for conducting heat of the combustion gas to indoor air;   an air blower which blows the indoor air so as to receive heat from the heat exchanger;   a combustion operation controller which controls operation of the combustor; and   a retry operation controller which carries out the ignition action of the combustor in the case where a predetermined period of time lapsed from the time it is determined that the combustion at the combustor is discontinued during combustion operation by the combustion operation controller, determines whether or not the combustion at the combustor is started, and repeats the ignition action of igniting the combustor, in the case where it is determined that the predetermined period of time lapsed from the time it is determined that the combustion at the combustor is not started, until it is determined that the combustion at the combustor is started.   
     
     
         2 . The warm air furnace according to  claim 1 , wherein
 the retry operation controller carries out the ignition action of igniting the combustor in the case where a difference between a target room temperature set by a room temperature setting switch and a detected room temperature detected by a room temperature sensor becomes equal to or more than a predetermined temperature, and the predetermined time lapses.   
     
     
         3 . The warm air furnace according to  claim 1 , wherein
 the air intake is comprised of an air intake tube which takes in outdoor air.   
     
     
         4 . The warm air furnace according to  claim 1 , wherein
 the air intake is comprised of an air intake tube which takes in indoor air.