Patent ID: 11933521
Assignee: NORITZ CORPORATION
Field: Thermal processes and apparatus (Mechanical engineering)
Classification: CPC F | IPC F

Claim 0:
1. A hot water supply device, comprising:
a combustion part;
a gas supply part for supplying fuel gas to the combustion part;
a combustion fan for supplying combustion air to the combustion part;
a heat exchange part;
a water supply part;
an exhaust port for exhausting combustion gas to outside;
a hot water discharge part; and
a control part,
wherein the hot water supply device is configured to perform a heating operation in which hot water supplied from the water supply part is heated in the heat exchange part by combustion heat generated in the combustion part to discharge the hot water at the hot water discharge part, and the control part performs detection and notification of a failure sign of a plurality of elemental components configuring the hot water supply device based on responsiveness and deviation with respect to a control target value in the heating operation,
wherein in the hot water supply device,
the heating operation is operated by controlling a plurality of steps set for each of the plurality of elemental components, and
the control part determines a status of the hot water supply device based on responsiveness and deviation with respect to a control target value detected in an initial step among the plurality of steps, and when it is determined that the status is normal, the control part performs the detection of the failure sign based on responsiveness and deviation with respect to a control target value detected in a next step following the initial step,
wherein the control part performs detection and notification of a failure sign of the combustion fan based on rotational responsiveness and deviation of the combustion fan with respect to a target rotation speed,
the heating operation comprises:
a pre-purge step, which is the initial step that drives the combustion fan for a predetermined time with the target rotation speed set to a predetermined scavenging rotation speed; and
an ignition step, which is the next step that drives the combustion fan with the target rotation speed set to a predetermined ignition rotation speed after the pre-purge step and performs an ignition operation, and

in the pre-purge step, the control part determines a presence or absence of a disturbance factor from the outside based on the rotational responsiveness and the deviation of the combustion fan with respect to the scavenging rotation speed, which is the control target value, wherein when there is wind blowing into the exhaust port from the outside and flowing back to the outside, thereby causing a rotation speed of the combustion fan to be decreased, the control part determines that there is a disturbance factor and continues the heating operation by proceeding to the ignition step without performing the detection of the failure sign of the combustion fan, and when it is determined that there is no disturbance factor, the control part proceeds to the ignition step and performs the detection of the failure sign based on the rotational responsiveness and the deviation of the combustion fan with respect to the ignition rotation speed, which is the control target value.