Water heater

Abstract

Processing executed by a water heater includes: performing a first ignition operation in a first test operation mode; in the case where ignition is detected, determining a combination of gas and an adjustment part to be abnormal; performing a second ignition operation in a second test operation mode; in the case where ignition is detected, determining a combination of gas and an adjustment part to be normal; and, in the case where no ignition is detected, determining a combination of gas and an adjustment part to be abnormal.

What is claimed is: 
     
         1 . A water heater, capable of using each of a plurality of types of gas as fuel, a first type of gas among the plurality of types of gas having a greater calorific value than a second type of gas, wherein the water heater comprises:
 a venturi, comprising an air intake port and a gas intake port, comprising a supply path of air and gas to a combustion chamber, and where the gas is drawn in response to negative pressure generated by passing air;   an adjustment part, replaceably incorporated into a gas supply path, having an inner diameter according to a gas type;   a fan, mixing air and gas and supplying the mixed air and gas to the combustion chamber;   a burner, for combusting gas;   an ignition part, igniting the burner;   a sensor, detecting that combustion is being performed in the combustion chamber; and   a control device, operating the water heater in a plurality of test operation modes,   wherein the control device:
 in a first test operation mode among the plurality of test operation modes, causes the fan to rotate at a rotation speed preset to be lower than a rotation speed during normal ignition; 
 causes the ignition part to ignite the burner; and, 
 in response to combustion being detected before a predetermined first time elapses from the ignition of the burner, considering that the first type of gas is being supplied to the combustion chamber and an adjustment part for the second type of gas is incorporated into the water heater, determines a combination of the gas used as fuel and the adjustment part to be erroneous. 
   
     
     
         2 . The water heater according to  claim 1 , wherein
 the control device:
 in response to no combustion being detected in the first test operation mode, ends the first test operation mode and transitions to a second test operation mode different from the first test operation mode; 
 causes the fan to rotate at a rotation speed pre-defined as the rotation speed during normal ignition; 
 causes the ignition part to ignite the burner; 
 in response to no combustion being detected before a predetermined second time elapses from the ignition of the burner, considering that the second type of gas is being supplied to the combustion chamber and an adjustment part for the first type of gas is incorporated into the water heater, determines a combination of the gas used as fuel and the adjustment part to be erroneous; and, 
 in response to combustion being detected before the second time elapses, determines the combination to be correct. 
   
     
     
         3 . The water heater according to  claim 1 , wherein
 the first type of gas is liquefied petroleum gas; and   the second type of gas is natural gas.   
     
     
         4 . The water heater according to  claim 2 , wherein
 the first type of gas is liquefied petroleum gas; and   the second type of gas is natural gas.   
     
     
         5 . The water heater according to  claim 1 , further comprising:
 a reporting part, reporting a result of any of the determinations.   
     
     
         6 . The water heater according to  claim 2 , further comprising:
 a reporting part, reporting a result of any of the determinations.   
     
     
         7 . The water heater according to  claim 5 , wherein
 the reporting part comprises:
 a display device or a speaker, provided in the water heater; or 
 a remote controller capable of wireless communication with the water heater, or a transmitter transmitting a signal indicating a result of the reporting to an information communication terminal capable of wireless communication with the water heater. 
   
     
     
         8 . The water heater according to  claim 6 , wherein
 the reporting part comprises:
 a display device or a speaker, provided in the water heater; or 
 a remote controller capable of wireless communication with the water heater, or a transmitter transmitting a signal indicating a result of the reporting to an information communication terminal capable of wireless communication with the water heater.