Abstract: A ventilation and air-conditioning system includes: a heat-exchange ventilation apparatus discharging air in space to be ventilated drawn in from a first inlet to outdoors via a heat-exchange element, and blowing air in outdoors from a first outlet into the space to be ventilated via the heat-exchange element; and an air-conditioning apparatus including an indoor unit including a second inlet and a second outlet each installed in the space to be ventilated, and an outdoor unit installed outside the space to be ventilated, and drawing in air in the space to be ventilated from the second inlet and blowing the air from the second outlet into the space to be ventilated. The air-conditioning apparatus performs anti-freezing operation assist operation to blow air from the second outlet toward the first inlet, based on an anti-freezing operation assist request level indicating magnitude of risk of freezing occurring in the heat-exchange element.

Abstract: A liquid ejection apparatus includes a controller configured to perform: causing a voltage application circuit to apply a voltage between a liquid ejection head having a plurality of nozzles and an electrode; driving the liquid ejection head for causing a certain nozzle to eject liquid toward a cap in a state where the plurality of nozzles face the cap; receiving a signal from a signal output circuit; determining, based on the received signal, whether the certain nozzle has ejected liquid normally; determining, based on the received signal, whether a leakage current has occurred between the certain nozzle and the electrode; and specifying the certain nozzle as a leakage nozzle if the leakage current has occurred between the certain nozzle and the electrode.

Abstract: A printer includes a head, an electrode, a moving unit, a voltage application circuit, and a controller. The head has an ejection surface having a nozzle. The head is configured to eject liquid from the nozzle. The moving unit is configured to move at least one of the electrode or the head. The voltage application circuit is configured to apply a certain voltage between the head and the electrode. The controller is configured to: drive the moving unit such that the ejection surface faces the electrode; drive the voltage application circuit to apply the certain voltage between the head and the electrode; compare a level of an output signal input to the controller from the electrode with a particular threshold; and based on the comparison result, determine that liquid is present between the ejection surface and the electrode.

Abstract: There is provided a liquid ejection apparatus, including: a head; a signal output circuit; a discharge mechanism; a controller; and a memory in which association information is stored. The controller is configured to: diagnose a degree of defectiveness of the head based on a signal from the signal output circuit; and receive, from a user, an input of discharge amount information. In response to the input of the discharge amount information, the controller is configured to: control the discharge mechanism to discharge a liquid by a discharge amount corresponding to the discharge amount information; and change the association in the association information based on the discharge amount corresponding to the discharge amount information and a discharge amount that corresponds to the degree of the defectiveness of the head.

Abstract: A liquid droplet discharging apparatus includes: a discharging head having: a liquid channel including a nozzle; and an energy applying part which applies, to liquid inside the liquid channel, discharge energy for discharging a liquid droplet from the nozzle; a signal outputting circuit which outputs signals depending on whether the nozzle satisfies a predetermined discharging performance; and a controller. The controller determines whether the nozzle satisfies the predetermined discharging performance, and estimates viscosity of the liquid inside the discharging head based on: viscosity estimation data in which discharge energy information and viscosity information are associated with each other, and a result of the determination performed in a case that the controller controls the energy applying part based on the discharge energy information and that the discharge energy is thereby applied to the liquid inside the liquid channel.

Abstract: A liquid ejection apparatus includes a liquid ejection head having an array of nozzles each configured to eject liquid, a storage, and a controller. The storage stores first data including distribution patterns and causes of an ejection failure and second data including causes of an ejection failure and maintenance manners. In a case where the nozzles include a failure nozzle, the controller determines a cause of a currently-occurring ejection failure based on the first data, perform maintenance in a first maintenance manner associated with the cause based on the second data. In a case where the currently-occurring ejection failure due to the cause has been recovered a predetermined number of times by maintenance in the first maintenance manner, the controller is configured to change the first maintenance manner associated with the cause to a second maintenance manner in the second data.

Abstract: An image recording system includes a plurality of image recording apparatuses. In a case where a certain image recording apparatus of the image recording apparatuses has a failure nozzle proportion of failure nozzles of all the nozzles of the recording head smaller than or equal to a threshold, image recording is performed on the certain image recording apparatus based on a recording instruction. In a case where the certain image recording apparatus has a failure nozzle proportion exceeding the threshold, a recording instruction is transmitted to a different image recording apparatus having a failure nozzle proportion smaller than that of the certain image recording apparatus, and image recording is performed on the different image recording apparatus based on the recording instruction.

Abstract: A liquid discharging apparatus includes: a liquid discharging head having nozzles; a purge mechanism which performs purge of discharging liquid from the nozzles; a signal outputting circuit which outputs signals depending on whether each of the nozzles is a failure nozzle which does not satisfy a predetermined discharging performance; a memory which stores, with respect to each of the nozzles, a value of an failure parameter regarding a number of times each of the nozzles is continuously determined to be the failure nozzle; and a controller. The controller performs failure nozzle determination with respect to at least a part of the nozzles as to whether each of at least the part of the nozzles is the failure nozzle, based on a signal from the signal outputting circuit, and updates the value of the failure parameter in the memory, based on a result of the failure nozzle determination.

Abstract: An image recording system includes a plurality of image recording apparatuses. In a case where a certain image recording apparatus of the image recording apparatuses has a failure nozzle proportion of failure nozzles of all the nozzles of the recording head smaller than or equal to a threshold, image recording is performed on the certain image recording apparatus based on a recording instruction. In a case where the certain image recording apparatus has a failure nozzle proportion exceeding the threshold, a recording instruction is transmitted to a different image recording apparatus having a failure nozzle proportion smaller than that of the certain image recording apparatus, and image recording is performed on the different image recording apparatus based on the recording instruction.

Abstract: A liquid ejection apparatus includes a controller configured to perform: causing a voltage application circuit to apply a voltage between a liquid ejection head having a plurality of nozzles and an electrode; driving the liquid ejection head for causing a certain nozzle to eject liquid toward a cap in a state where the plurality of nozzles face the cap; receiving a signal from a signal output circuit; determining, based on the received signal, whether the certain nozzle has ejected liquid normally; determining, based on the received signal, whether a leakage current has occurred between the certain nozzle and the electrode; and specifying the certain nozzle as a leakage nozzle if the leakage current has occurred between the certain nozzle and the electrode.

Abstract: A printer includes a head, an electrode, a moving unit, a voltage application circuit, and a controller. The head has an ejection surface having a nozzle. The head is configured to eject liquid from the nozzle. The moving unit is configured to move at least one of the electrode or the head. The voltage application circuit is configured to apply a certain voltage between the head and the electrode. The controller is configured to: drive the moving unit such that the ejection surface faces the electrode; drive the voltage application circuit to apply the certain voltage between the head and the electrode; compare a level of an output signal input to the controller from the electrode with a particular threshold; and based on the comparison result, determine that liquid is present between the ejection surface and the electrode.

Abstract: A liquid ejection apparatus includes a liquid ejection head having an array of nozzles each configured to eject liquid, a storage, and a controller. The storage stores first data including distribution patterns and causes of an ejection failure and second data including causes of an ejection failure and maintenance manners. In a case where the nozzles include a failure nozzle, the controller determines a cause of a currently-occurring ejection failure based on the first data, perform maintenance in a first maintenance manner associated with the cause based on the second data. In a case where the currently-occurring ejection failure due to the cause has been recovered a predetermined number of times by maintenance in the first maintenance manner, the controller is configured to change the first maintenance manner associated with the cause to a second maintenance manner in the second data.

Abstract: An air-conditioning system includes: a ventilator that ventilates the inside of a room and includes an exhaust fan that sends air taken from the room to the outside, a supply fan that sends air taken from the outside into the room, and a control unit that controls a ventilation air volume of operation with the exhaust fan and the supply fan; and a human detection sensor that detects the presence or absence of a human in the room. The control unit is capable of switching the ventilation air volume to at least a first air volume and a second air volume higher than the first air volume, and sets the ventilation air volume to the first air volume when the presence of a human is not detected by the human detection sensor.

Abstract: A liquid ejection apparatus is provided, comprising a liquid ejection head, a signal output circuit which outputs different signals depending on the number of ejection-defective nozzles in which any defective discharge of a liquid occurs, and a controller. The controller executes judgment to judge whether a first condition that any ejection-defective nozzle is absent in two or more nozzles for constructing a first nozzle group is satisfied, a second condition that all of the nozzles are the ejection-defective nozzles is satisfied, or a third condition that only some of the nozzles are the ejection-defective nozzles is satisfied, on the basis of the signal outputted from the signal output circuit.

Abstract: There is provided a liquid ejection apparatus, including: a head; a signal output circuit; a discharge mechanism; a controller; and a memory in which association information is stored. The controller is configured to: diagnose a degree of defectiveness of the head based on a signal from the signal output circuit; and receive, from a user, an input of discharge amount information. In response to the input of the discharge amount information, the controller is configured to: control the discharge mechanism to discharge a liquid by a discharge amount corresponding to the discharge amount information; and change the association in the association information based on the discharge amount corresponding to the discharge amount information and a discharge amount that corresponds to the degree of the defectiveness of the head.

Abstract: A liquid ejection apparatus is provided, comprising a liquid ejection head, a signal output circuit which outputs different signals depending on the number of ejection-defective nozzles in which any defective discharge of a liquid occurs, and a controller. The controller executes judgment to judge whether a first condition that any ejection-defective nozzle is absent in two or more nozzles for constructing a first nozzle group is satisfied, a second condition that all of the nozzles are the ejection-defective nozzles is satisfied, or a third condition that only some of the nozzles are the ejection-defective nozzles is satisfied, on the basis of the signal outputted from the signal output circuit.

Abstract: A liquid discharging apparatus includes: a liquid discharging head having nozzles; a purge mechanism which performs purge of discharging liquid from the nozzles; a signal outputting circuit which outputs signals depending on whether each of the nozzles is a failure nozzle which does not satisfy a predetermined discharging performance; a memory which stores, with respect to each of the nozzles, a value of an failure parameter regarding a number of times each of the nozzles is continuously determined to be the failure nozzle; and a controller. The controller performs failure nozzle determination with respect to at least a part of the nozzles as to whether each of at least the part of the nozzles is the failure nozzle, based on a signal from the signal outputting circuit, and updates the value of the failure parameter in the memory, based on a result of the failure nozzle determination.

Abstract: A liquid droplet discharging apparatus includes: a discharging head having: a liquid channel including a nozzle; and an energy applying part which applies, to liquid inside the liquid channel, discharge energy for discharging a liquid droplet from the nozzle; a signal outputting circuit which outputs signals depending on whether the nozzle satisfies a predetermined discharging performance; and a controller. The controller performs determination as to whether the nozzle satisfies the predetermined discharging performance, and estimates viscosity of the liquid inside the discharging head based on: viscosity estimation data in which discharge energy information and viscosity information are associated with each other, and a result of the determination performed in a case that the controller controls the energy applying part based on the discharge energy information and that the discharge energy is thereby applied to the liquid inside the liquid channel.