Patent Description:
<CIT> proposes a heat-pump system comprising a plurality of usage-side units and a plurality of indicators for outputting information relating to the heat-pump system. The indicators are connected to the usage-side units, respectively. Each usage-side unit is configured to send alarm information to the connecting indicator when a refrigerant leakage has occurred. Each indicator is configured to, when it has received the alarm information from the connecting usage-side unit, output the alarm information on its display. Thereby, it is possible to inform a user of each usage-side unit of the occurrence of the refrigerant leakage.

<CIT> discloses an indicator for outputting information relating to a heat-pump system including a plurality of usage-side units which form a communication network, comprising: a mode management section configured to accept selection from a plurality of operation modes of the indicator including a first mode and a second mode; and an indicator output section configured to output information.

Meanwhile, there are cases in which alarm information of any of the usage-side units is desired to be outputted in one location. For example, in a monitoring room of a hotel, it is necessary for a monitoring person to promptly discern alarm information of any of air-conditioning units installed in different guest rooms. However, it is costly and burdensome to connect an information output device in the monitoring room to each of the air-conditioning units disposed in separate locations in order to obtain information therefrom.

Thus, as also proposed by <CIT>, the usage-side units may form a communication network, and the information output device may be connected to this network via one of the usage-side units. Information originating from any of the usage-side units is transmitted in the network by means of communication signals, and then transferred to the information output device via one of the usage-side unit. Thereby, it is possible to allow the information output device to obtain information from each of the usage-side units without individual connections. Hence, the alarm information can be outputted from not only the indicator connected to the usage-side unit with an abnormality but also the information output device.

However, providing the information output device which has a configuration different from the indicators would also increase the system cost. Moreover, when the location in which all the alarm information should be outputted needs to be changed, moving and reconnecting the information output device would be burdensome.

The object of the present invention is to provide an indicator for outputting information relating to a heat-pump system with high manageability and high usability at a low cost.

The object above is achieved by the indicator as defined in the appended claim <NUM>. Further advantageous effects can be obtained by the preferred embodiments defined by the appended dependent claims.

A first reference example of a heat-pump system comprises a plurality of usage-side units and a plurality of indicators for outputting information relating to the heat-pump system, wherein: each usage-side unit has an indicator-side communication section configured to transmit first and second unit signals to a predetermined indicator which is one of the indicators, an inter-unit communication section configured to transmit and receive inter-unit signals to and from the other usage-side unit, an information originating section configured to originate alarm information, send the originated alarm information to the predetermined indicator by means of a first unit signal, and send the originated alarm information to the other usage-side unit by means of an inter-unit signal, and an inter-unit signal processing section configured to, when alarm information has been received from the other usage-side unit by means of an inter-unit signal, transfer the received alarm information to the predetermined indicator by means of a second unit signal, and, if there is the rest usage-side unit which has not originated nor received the received alarm information, transfer the received alarm information to the rest usage-side unit by means of another inter-unit signal; and each indicator has a mode management section configured to accept selection from a plurality of operation modes of the indicator including a first mode, a unit-side communication section configured to receive or acquire first and second unit signals from the usage-side unit, and an indicator output section configured to, when alarm information has been received or acquired by means of a second unit signal during the indicator is operating in the first mode, output the alarm information.

With this heat-pump system according to the first reference example, it is possible to switch, just by selecting the first mode or not, the behaviour of each indicator regarding whether to output alarm information originated by the usage-side unit other than the predetermined usage-side unit which transmits first and second unit signals to the indicator. Thereby, it is possible to easily and arbitrarily impart, to any of the indicators, a function to output alarm information regardless of its origin. An information output device having a configuration different from the indicators and dedicated to outputting all alarm information is not required anymore. Moreover, compared with a system in which an information output device is connected to each of the usage-side units, it is possible to easily install a central information output function. Hence, a refrigerant system with high manageability and high usability can be provided at a low cost.

According to the refrigerant system mentioned above, the indicator output section may be further configured to, when alarm information has been received or acquired by means of a first unit signal, output the alarm information.

With this configuration, the indicator can output alarm information regardless of its operation mode if the alarm information is originated by the predetermined usage-side. In the above-mentioned case of the hotel for instance, only information originated by the air-conditioning unit in the guest room may be important for a guest using the guest room, while all alarm information originated by any of the indoor-units may be important for the monitoring person. Thus, by the heat-pump system mentioned above, both an information output suitable for a supervisor of the whole system and an information output suitable for a user of a specific usage-side unit can be achieved by the same indicator, and these different types of information output are selectable for each indicator as desired. Hence, it is possible to further improve the usability of the refrigerant system at low cost.

A second reference example of an indicator for outputting information relating to a heat-pump system including a plurality of usage-side units which form a communication network, comprises: a mode management section configured to accept selection from a plurality of operation modes of the indicator including a first mode; a unit-side communication section configured to receive or acquire first and second unit signals from a predetermined usage-side unit which is one of the usage-side units, the first unit signal being used for information originated by the predetermined usage-side unit, the second unit signal being used for information not originated by the predetermined usage-side unit; and an indicator output section configured to, when alarm information has been received or acquired by means of a second unit signal during the indicator is operating in a first mode, output the alarm information.

With this indicator according to the second reference example, it is possible to switch, just by selecting the first mode or not, the behaviour of each indicator regarding whether to output the alarm information originated by the usage-side unit other than the predetermined usage-side unit which transmits first and second unit signals to the indicator. Thereby, it is possible to easily and arbitrarily impart, to any of the indicators, a function to output alarm information regardless of its origin. An information output device having a configuration different from the indicators and dedicated to outputting all alarm information is not required anymore. Hence, a refrigerant system with high manageability and high usability can be provided at a low cost.

According to the indicator mentioned above, the indicator output section may be further configured to, when alarm information has been received or acquired by means of a first unit signal, output the alarm information.

With this configuration, the indicator can output alarm information regardless of its operation mode if the alarm information is originated by the predetermined usage-side unit. Hence, it is possible to further improve the usability of the refrigerant system at low cost.

According to any one of the indicators mentioned above, the indicator may further comprise: a unit signal processing section configured to, when information has been received or acquired by means of a second unit signal during the indicator is not operating in the first mode, restrain the information from being outputted by the indicator output section.

With this configuration, the indicator does not output the alarm information if the first mode is not selected and the alarm information is not originated by its predetermined usage-side unit, while allowing other information to be outputted. In other words, when the first mode is selected, the indicator outputs alarm information originating from any of the plurality of usage-side units, and, when the first mode is not selected, the indicator outputs alarm information only if it is originated by the predetermined usage-side unit. Thereby, it is possible to output various information from the indicators while limiting the output of alarm information to the case where the predetermined unit of the indicator has originated the alarm information and the case where the first mode has been selected to the indicator. Hence, it is possible to further improve the usability of the refrigerant system at low cost.

According to any one of the indicators mentioned above which has the unit signal processing section, the unit signal processing section may be further configured to, when non-alarm information has been received or acquired by means of any of first and second signals during the indicator is operating in the first mode, restrain the non-alarm information from being outputted by the indicator output section.

With this configuration, the indicator to which the first mode has been selected does not output information unless it is the alarm information. Thereby, it is possible to prevent the indicator operating in the first mode from outputting unnecessary information. Hence, it is possible to further improve the usability of the refrigerant system at low cost.

According to any one of the indicators mentioned above which has the unit signal processing section, the operation modes may further include a second mode; and the unit signal processing section may be further configured to, when non-alarm information has been received or acquired by means of a first unit signal during the indicator is operating in the second mode, restrain the non-alarm information from being outputted by the indicator output section.

With this configuration, the indicator does not output information if the second mode is selected and the information is originated by its predetermined usage-side unit but not the alarm information. Thereby, it is possible to easily and arbitrarily impart, to any of the indicators, a function to output only the alarm information originated by its predetermined usage-side unit. The user of the predetermined usage-side unit can discern the alarm information originated by the predetermined usage-side unit without being bothered by other unnecessary information. Hence, in a case where only alarm information is required, it is possible to further improve the usability of the refrigerant system at low cost.

According to any one of the indicators mentioned above, the indicator may further comprise: a terminal-side communication section configured to receive terminal signals from a mobile terminal by means of wireless communication, wherein the mode management section may be configured to, when a request on the selection from the operation modes has been received by means of a terminal signal, accept the request.

With this configuration, whether or not to operate in the first mode is changed according to the mode information received from the mobile terminal. Thereby, it is possible to select the first mode as desired by using the mobile terminal which is movable and different from the indicator. Thus, a human interface dedicated only for accepting the mode selection can be omitted from the indicator. Thereby, production cost of the indicator can be reduced, and usability of the refrigerant system is further improved.

According to any one of the indicators mentioned above which has the terminal-side communication section, the unit-side communication section may be further configured to transmit indicator signals to the predetermined usage-side unit and, when address information which is to be set as identification information of the predetermined usage-side unit has been received by means of a terminal signal, transfer the address information to the predetermined usage-side unit by means of an indicator signal.

With this configuration, the address information received from the mobile terminal is transferred the predetermined usage-side unit. Thereby, it is possible to set new identification information to the predetermined usage-side unit by using the mobile terminal which is movable and different from the indicator. A human interface dedicated only for receiving the new identification setting can be omitted from the indicator. Thereby, production cost of the indicator can be reduced, and usability of the refrigerant system is further improved.

According to any one of the indicators mentioned above, the alarm information may include identification information of usage-side units in which an abnormality has occurred.

With this configuration, when the alarm information is received or acquired, the indicator can notify a user of both the occurrence of the abnormality and the identification information of the usage-side unit in which the abnormality has occurred. Thereby, it is possible for the user to discern where the abnormality has occurred. Hence, the manageability of the heat-pump system can be further improved at a low cost.

According to any one of the indicators mentioned above with which the alarm information includes the identification information, the abnormality includes a refrigerant leakage.

With this configuration, it is possible to inform the user of the occurrence of the refrigerant leakage. Thus, it is possible to further improve the manageability and safety of the refrigerant system at low cost.

A third reference example of a usage-side unit as one of a plurality of usage-side units of a heat-pump system, comprises: an indicator-side communication section configured to transmit first and second unit signals to an indicator; an inter-unit communication section configured to transmit and receive inter-unit signals to and from the other usage-side unit; an information originating section configured to originate alarm information, send the originated alarm information to the indicator by means of a first unit signal, and send the originated alarm information to the other usage-side unit by means of an inter-unit signal; and an inter-unit signal processing section configured to, when alarm information has been received by means of an inter-unit signal, transfer the received alarm information to the indicator by means of a second unit signal, and, if there is the rest usage-side unit which has not originated nor received the received alarm information, transfer the received alarm information to the rest usage-side unit by means of another inter-unit signal.

With this usage-side unit according to the third reference example, the alarm information originated in any of the plurality of the usage-side unit is to be shared by them. The shared alarm information is sent by each usage-side unit to an indicator by means of a first unit signal when the alarm information has been originated by the usage-side unit itself, and by means of a second unit signal when the alarm information has been not originated by the usage-side unit itself. Thereby, it is possible to send all alarm information regardless of its origin to the indicator while allowing the indicator to know whether or not the sent alarm information was originated by the usage-side unit. This makes possible for the indicator to select, from among all shared alarm information, alarm information to be outputted according to origins of the alarm information.

According to the usage-side unit mentioned above, the indicator-side communication section is further configured to receive indicator signals from the indicator; the usage-side unit further comprises an indicator signal processing section configured to, when address information which is to be set as identification information of the usage-side unit has been received by means of an indicator signal, set the address information as identification information of the usage-side unit; and the information originating section is configured to, when an abnormality has occurred in the usage-side unit, originate alarm information including the set identification information.

With this configuration, it is possible to, when the abnormality has occurred in the usage-side unit, make the predetermined indicator notify a user of both the occurrence of the abnormality and the identification information of the usage-side unit in which the abnormality has occurred. Thereby, it is possible for the user to discern where the abnormality has occurred. Hence, the manageability of the heat-pump system can be further improved at a low cost.

A fourth reference example of an information output method in an indicator for outputting information relating to a heat-pump system including a plurality of usage-side units which form a communication network, comprises: accepting selection from a plurality of operation modes of the indicator including a first mode; receiving or acquiring any of first and second unit signals from a predetermined usage-side unit which is one of the usage-side units, the first unit signal being used for information originated by the predetermined usage-side unit, the second unit signal being used for information not originated by the predetermined usage-side unit; and, when alarm information has been received or acquired by means of a second unit signal during the indicator is operating in a first mode, outputting the alarm information.

With this information output method according to the fourth reference example, it is possible to switch, just by selecting the first mode or not, the behaviour of each indicator regarding whether to output the alarm information originated by the usage-side unit other than the predetermined usage-side unit which transmits first and second unit signals to the indicator. Thereby, it is possible to easily and arbitrarily impart, to any of the indicators, a function to output alarm information regardless of its origin. An information output device having a configuration different from the indicators and dedicated to outputting all alarm information is not required anymore. Hence, a refrigerant system with high manageability and high usability can be provided at a low cost.

According to the information output method mentioned above, the method may further comprise, when alarm information has been received or acquired by means of a first unit signal, outputting the alarm information.

With this configuration, the indicator can output alarm information indicated by a first unit signal regardless of its operation mode if the alarm information is originated by the predetermined usage-side unit. Hence, it is possible to further improve the usability of the refrigerant system at low cost.

A preferred embodiment of a heat-pump system according to the present invention will be described with reference to the drawings.

<FIG> shows a schematic configuration of a heat-pump system according to an embodiment of the present invention.

As shown in <FIG>. a heat-pump system <NUM> according to the present embodiment comprises a heat-source-side unit <NUM>, a plurality of usage-side units <NUM> each having a unit controller <NUM>, a plurality of indicators <NUM>, and a mobile terminal <NUM>. For instance, the heat-pump system <NUM> is an air-conditioning system, and the heat-source-side unit <NUM> and the usage-side units <NUM> are an outside unit and indoor units, respectively.

In this embodiment, the explanations will be made on a premise that: the first usage-side unit 220_1 having the first unit controller 300_1, and the first indicator 400_1 are disposed in a first target area 611_1; the second usage-side unit 220_2 having the second unit controller 300_2, and the second indicator 400_2 are disposed in a second target area 611_1; and the supervisor-use indicator 400_S is disposed in a monitoring room <NUM>. However, the arrangement of these devices is not limited to this. Two or more of the usage-side units <NUM> may be disposed in the same target area <NUM>. Two or more of the indicators <NUM> may be disposed in the same target area <NUM>. The supervisor-use indicator 400_S may be disposed in a different place, e.g. one of the target areas <NUM>. Two or more of the supervisor-use indicators 400_S may also be provided.

All the unit controllers <NUM> including the first and second unit controllers 300_1, 300_2 have substantially the same configuration. Thus, each of the unit controllers <NUM> will be called just as "the unit controller <NUM>" when the explanation is applicable to all the unit controllers <NUM>. Similarly, each of the usage-side units <NUM> including the first and second unit units 220_1, 220_2 will also be called just as "the usage-side unit <NUM>" when the explanation is applicable to all the usage-side units <NUM>. All the indicators <NUM> including the first and second indicators 400_1, 400_2 and the supervisor-use indicator 400_S also have substantially the same configuration. Thus, in this embodiment, each of the indicators <NUM> is also called just as "the indicator <NUM>" when the explanation is applicable to all the indicators <NUM>.

The heat-source-side unit <NUM> is configured to supply cold heat and/or hot heat to the usage-side units <NUM> by circulating refrigerant via refrigerant pipes (not shown). The heat-source-side unit <NUM> is also configured to communicate with the usage-side units <NUM> via wired/wireless communication paths <NUM>. These communication paths <NUM> may be established by LAN (Local Area Network).

The usage-side unit <NUM> is configured to utilize the cold heat and/or hot heat supplied from the heat-source-side unit <NUM>. For instance, the usage-side unit <NUM> has a heat exchanger and an air blower (not shown) to perform a heat exchange between the refrigerant and an air in the target area <NUM>. The usage-side unit <NUM> also has a leakage sensor <NUM> in addition to the unit controller <NUM>.

The leakage sensor <NUM> is configured to, when a refrigerant leakage has occurred in the usage-side unit <NUM>, detect this refrigerant leakage, and inform of it to the unit controller <NUM>. The leakage sensor <NUM> may be a semi-conductor gas sensor reactive to the refrigerant, and is disposed inside or outside the usage-side unit <NUM>. The usage-side unit <NUM> need not necessarily include the leakage sensor <NUM>, i.e. may utilize an external leakage sensor. In this case, the unit controller <NUM> has a wired/wireless communication interface for communicating with the external leakage sensor to transmit signals thereto or/and receive signals therefrom.

The unit controllers <NUM> of the usage-side units <NUM> are configured to form a communication network via wired/wireless communication paths <NUM>. This communication network may be established by LAN (Local Area Network). For instance, the unit controllers <NUM> are connected in series by the wired/wireless communication paths <NUM> as shown in <FIG>. In this embodiment, the explanations will be made on a premise that the first unit controller 300_1, the second unit controller 300_2, and the other unit controllers (not shown) are serially connected in this order. However, the connection configuration of the unit controllers <NUM> is not limited to this.

The unit controller <NUM> is configured to communicate with one or more of the indicators <NUM> via one or more of via wired/wireless communication paths <NUM>. These communication paths <NUM> may be established by LAN (Local Area Network). In this embodiment, the explanations will be made on a premise that the first indicator 400_1 and the supervisor-use indicator 400_S are connected with the first unit controller 300_1, and that the second indicator 400_2 is connected with the first unit controller 300_1. Thus, the first indicator 400_1 and the supervisor-use indicator 400_S can directly communicate with the first unit controller 300_1, but not with the any other unit controller <NUM> such as the second unit controller 300_2. The second indicator 400_2 can directly communicate with the second unit controller 300_2, but not with the any other unit controller <NUM> such as the first unit controller 300_1.

Hereinafter, the unit controller <NUM> with which the indicator <NUM> under explanation can communicate, without an intervention of any other unit controller <NUM>, will be referred to as "the connecting unit controller <NUM>" as necessary. Similarly, the usage-side unit <NUM> having the connecting unit controller <NUM> will be referred to as "the connecting usage-side unit <NUM>" as necessary. The indicator <NUM> with which the unit controller <NUM> under explanation can communicate, without an intervention of any other unit controller <NUM>, will also be referred to as "the connecting indicator <NUM>" as necessary.

The unit controller <NUM> is also configured to receive information from the connecting indicator <NUM>, and operate according to the received information. Thus, the first unit controller <NUM> operates according to information received from the first indicator 400_1 and the supervisor-use indicator 400_S, the second unit controller <NUM> operates according to information received from the second indicator 400_2. However, the supervisor-use indicator 400_S does not necessarily have a function of transmitting such information to the first indicator 400_1. This limitation of functions may be achieved by later-mentioned setting of a first mode.

The unit controller <NUM> is further configured to originate alarm information, and share the originated alarm information with all the other unit controllers <NUM> by using the above-mentioned communication network formed by the unit controllers <NUM>. The unit controller <NUM> is also configured to send the shared alarm information to the connecting indicator <NUM> regardless of whether or not the alarm information is originated by the unit controller <NUM> itself.

For instance, when the first unit controller 300_1 has originated alarm information, the first unit controller 300_1 transmits the originated alarm information to the second unit controller 300_2, the first indicator 400_1, and the supervisor-use indicator 400_S. The second unit controller 300_2 transfers the received alarm information to the second indicator 400_2 and the further other unit controller <NUM> (not shown). Meanwhile, when the second unit controller 300_2 has generated alarm information, the second unit controller 300_2 transmits the originated alarm information to the first unit controller 300_1, the further other unit controller (not shown), and the second indicator 400_2. The first unit controller 300_1 transfers the received alarm information to the first indicator 400_1 and the supervisor-use indicator 400_S.

In this embodiment, the explanations will be made on a premise that the unit controller <NUM> is configured to originate alarm information when a refrigerant leakage has occurred in the usage-side unit <NUM> to which the unit controller <NUM> belongs, e.g. when the leakage sensor <NUM> which belongs to the same usage-side unit <NUM> has detected a refrigerant leakage. However, a trigger of originating alarm information is not limited to this. The trigger may be an occurrence of another abnormality, such as an excessive increase in refrigerant pressure, an excessive increase in air resistance, and/or other malfunctions of the usage-side unit <NUM>.

The indicator <NUM> is configured to output information relating to the heat-pump system <NUM>. More specifically, the indicator <NUM> is configured to receive or acquire information from the connecting unit controller <NUM>, and output the received or acquired information. Here, outputting information may include outputting: a visual image such as a picture, a symbol, a text or light; a sound such as a buzzer or a speech sound; and/or a vibration which represent a type and/or a content of information and indicates a reception of the information. Meanwhile, as detailed later, the indicator <NUM> is also configured to restrict its information output depending on: whether or not the information has been originated by the connecting unit controller <NUM>; whether or not the information is alarm information; and whether or not the indicator <NUM> is operating in a specific mode.

In addition, the indicator <NUM> is configured to communicate with the mobile terminal <NUM> via a wireless communication path <NUM>. This wireless communication is preferably a short-range radio communication, such that only one of the indicators <NUM> can establish this communication with the mobile terminal <NUM> at a time. For instance, when the mobile terminal <NUM> in the first target area 611_1, only the first indicator 400_1 among the indicators <NUM> can communicate with the mobile terminal <NUM>. The indicator <NUM> is configured to receive information from the mobile terminal <NUM>, operate according to the received information, and further transfer the received information to the unit controller <NUM> depending on the type of the information.

<FIG> shows an example of appearance of the indicator <NUM>.

As shown <FIG>, the indicator <NUM> may have a casing <NUM>, an on/off button <NUM>, a display panel <NUM> including a display area <NUM> and an operation area <NUM>, a loudspeaker <NUM>, and an LED (Light Emitting Diode) <NUM>.

The casing <NUM> has a plate-like outer shape, and is formed with a back surface for being attached to a wall or the like and a main surface on the opposite side of the back surface. The casing <NUM> covers most part of the indicator <NUM>. The on/off button <NUM> is disposed on one of the surfaces of the casing <NUM>, and configured to receive user operations for switching on and off the indicator <NUM>. The display panel <NUM> is disposed on the main surface of the casing <NUM>, and configured to display information by means of texts, symbols, pictures or the like. The display panel <NUM> may be a touch panel display. The display area <NUM> is configured to change its display contents. The operation area <NUM> is configured to receive user operations for switching on and off the information display by the indicator <NUM>. The operation area <NUM> is also configured to receive user operations for changing the display contents, the operation of the indicator <NUM>, and the operation of the usage-side unit <NUM>. The loudspeaker <NUM> is configured to output information by means of a sound. The LED <NUM> is configured to output information by means of light.

The mobile terminal <NUM> of <FIG> is configured to receive requests relating to the heat-pump system <NUM> from a user <NUM> of mobile terminal <NUM>. The user <NUM> is a monitoring person of the heat-pump system <NUM> who normally resides in the monitoring room <NUM>, for instance. The mobile terminal <NUM> is also configured to transmit information based on the received request to the indicator <NUM> which is connected with the mobile terminal <NUM> via the wireless communication path <NUM>. The mobile terminal <NUM> may be further configured to receive information from the indicator <NUM>, and output the received information by means of a visual image, a sound, and/or a vibration. The mobile terminal <NUM> may be a smart phone, a tablet device or the like.

Although not shown, the unit controller <NUM>, the indicator <NUM>, and the mobile terminal <NUM> each include an arithmetic circuit such as a CPU (Central Processing Unit), a work memory used by the CPU such as a RAM (Random Access Memory), and a recording medium storing control programs and information used by the CPU such as a ROM (Read Only Memory). The unit controller <NUM>, the indicator <NUM>, and the mobile terminal <NUM> are each configured to perform information processing and signal processing by the CPU executing the control programs to control operation thereof, so as to achieve their functions and operations.

With the above heat-pump system <NUM>, it is possible to output information relating to the heat-pump system <NUM>, including alarm information relating to any of the usage-side units <NUM>, from any of the indicators <NUM>. Moreover, it is possible for the user <NUM> to operate each of the usage-side units <NUM> and each of the indicators <NUM> by using the mobile terminal <NUM> such that, for instance, desired information is outputted from the closest indicator <NUM>.

However, there are cases where outputting all the information originated by any of the usage-side units <NUM> is not preferable. For instance, when a refrigerant leakage has occurred in the second usage-side unit 220_2, the alarm information should be outputted from the second indicator 400_2 and the supervisor-use indicator 400_S, but not from the first indicator 400_1. Meanwhile, the information originated by the first usage-side unit 220_1 should be outputted from the first indicator 400_1 and the supervisor-use indicator 400_S, but not from the second indicator 400_2. In this regard, the heat-pump system <NUM> is configured to regulate the information output from the indicators <NUM> such that only necessary information output is performed in each of the indicators <NUM>.

<FIG> is a block diagram indicating a functional configuration of the unit controller <NUM>.

As shown in <FIG>, the usage-side unit <NUM> includes a system-side communication section <NUM>, an indicator-side communication section <NUM>, an inter-unit communication section <NUM>, an operation control section <NUM>, an abnormality detection section <NUM>, a unit storage section <NUM>, and a communication control section <NUM>.

The system-side communication section <NUM> is configured to establish the communication path <NUM> with the heat-source-side unit <NUM> to communicate therewith (see <FIG>).

The indicator-side communication section <NUM> is configured to establish the communication path <NUM> with the indicator <NUM> (a predetermined indicator) to communicate therewith (see <FIG>). In particular, the indicator-side communication section <NUM> is configured to transmit first unit signals and second unit signals to the indicator <NUM>, and receive indicator signals from the indicator <NUM>. Here, a first unit signal is a signal used for information originated by the unit controller <NUM> itself, and a second unit signal is a signal used for information not originated by the unit controller <NUM> itself. Details regarding the first and second unit signals will be explained later. The indicator-side communication section <NUM> may be connected with a plurality of the indicators <NUM>.

The inter-unit communication section <NUM> is configured to establish the communication path <NUM> with the other unit controller <NUM> to communicate therewith (see <FIG>). In particular, the inter-unit communication section <NUM> is configured to transmit and receive inter-unit signals to and from the other unit controller <NUM> of the other usage-side unit <NUM>. The inter-unit communication section <NUM> may be connected with a plurality of the other unit controllers <NUM>.

The system-side communication section <NUM>, the indicator-side communication section <NUM>, and the inter-unit communication section <NUM> may be a LAN interfaces, and may use the same communication protocol or different communication protocols.

The operation control section <NUM> is configured to control the operation of the usage-side unit <NUM> for utilizing the cold heat and/or hot heat supplied from the heat-source-side unit <NUM> according to operation information provided from the communication control section <NUM>. For instance, the operation control section <NUM> is configured to control the flow of the refrigerant in the heat exchanger and operation of the air blower. The operation information may include instructions for changing a target temperature of the air in the target area <NUM>, changing an air volume level of the air blower, changing an operation mode between a cooling operation mode and a heating operation mode, on/off of the operation for utilizing the cold heat and/or hot heat, and so on.

The abnormality detection section <NUM> is configured to, when a predetermined abnormality has occurred in the usage-side unit <NUM>, detect this occurrence of the abnormality. For instance, the abnormality detection section <NUM> is configured to receive the information from the leakage sensor <NUM> when a refrigerant leakage has occurred (see <FIG>).

The unit storage section <NUM> stores information in a form readable and rewritable by the communication control section <NUM>. The stored information includes identification (ID) information of the usage-side unit <NUM>. The unit storage section <NUM> may store an initial ID information which has been set to the usage-side unit <NUM> in advance. In this embodiment, the explanations will be made on a premise that a text "<NUM>" has been initially set to the first usage-side unit 220_1 and a text "<NUM>" has been initially set to the second usage-side unit 220_2.

The communication control section <NUM> is configured to control the communications with the heat-source-side unit <NUM>, the one or more of other unit controllers <NUM>, and the one or more of connecting indicators <NUM>. The communication control section <NUM> may be achieved by an application software installed to or updated in the unit controller <NUM>. The communication control section <NUM> includes an indicator signal processing section <NUM>, an information originating section <NUM>, and an inter-unit signal processing section <NUM>.

The indicator signal processing section <NUM> is configured to receive indicator signals transmitted from the connecting indicator <NUM> via the indicator-side communication section <NUM>, and process the received indicator signals. More specifically, the indicator signal processing section <NUM> is configured to, when operation information has been received by means of an indicator signal, pass it to the operation control section <NUM>. In addition, the indicator signal processing section <NUM> is configured to, when address information has been received by means of an indicator signal, rewrite the ID information stored in the unit storage section <NUM> by the obtained address information or add the obtained address information to the unit storage section <NUM> so as to set it as ID information of the usage-side unit <NUM>.

The indicator signal processing section <NUM> is also configured to, when indication information has been received by means of an indicator signal, pass it to the information originating section <NUM>. The indication information is information which indicates that status information indicating the operation status of the usage-side unit <NUM> is requested from the indicator <NUM>.

It should be noted that information which is sent, transferred, received, or acquired by means of a signal may be information contained in the signal, information a location of which is specified by the signal, or information an identification of which has been shared by a sender of the signal and a receiver of the signal in advance is specified by the signal. Thus, sending or transferring information by means of a signal may be transmitting a signal containing the information itself, transmitting a signal specifying a location of the information, or transmitting a signal specifying an identification of the information. Receiving or acquiring information by means of a signal may be extracting the information included in a signal, accessing a location specified by a signal to obtain the information, or identifying the information from an identification specified by a signal. A signal containing information, specifying a location of information, or specifying an identification of information may be expressed as a signal "indicating" the information.

The information originating section <NUM> is configured to originate information including alarm information. The information originating section <NUM> may originate, as mentioned above, alarm information when an occurrence of a refrigerant leakage has been informed of by the leakage sensor <NUM> via the abnormality detection section <NUM>. The information originating section <NUM> is further configured to send the originated information to the connecting indicator <NUM> by a first unit signal via the indicator-side communication section <NUM>, and also send the same originated information to the other usage-side unit <NUM> by means of an inter-unit signal via the inter-unit communication section <NUM>.

The information originating section <NUM> is preferably configured to read the latest ID information of the usage-side unit <NUM> from the unit storage section <NUM>, and embed the read ID information into the alarm information. Thereby, the alarm information includes ID information of the usage-side units <NUM> in which an abnormality has occurred. The latest ID information may be the initially set ID information if any other ID information has been set, or the ID information subsequently and lastly set by the indicator signal processing section <NUM>.

The information originating section <NUM> is also configured to originate the status information and send it to the indicator <NUM> by a first unit signal via the indicator-side communication section <NUM>. The status information may indicate the operation mode, the target temperature, the air volume level of the air blower or the like of the usage-side unit <NUM>. The information originating section <NUM> may send the status information autonomously and periodically, or send the status information passively upon receiving the indication information from the indicator <NUM> via the indicator signal processing section <NUM>.

The inter-unit signal processing section <NUM> is configured to receive inter-unit signals transmitted from the unit controller <NUM> of the other usage-side unit <NUM> via the inter-unit communication section <NUM>, and process the received inter-unit signals. More specifically, the inter-unit signal processing section <NUM> is configured to, when information has been received by means of an inter-unit signal, send it to the indicator <NUM> (a predetermined indicator) by a second unit signal via the indicator-side communication section <NUM>. Such information includes alarm information originated by one of the other usage-side units <NUM>.

The inter-unit signal processing section <NUM> is also configured to, if there is any rest usage-side unit <NUM>, transfer the information to the rest usage-side unit <NUM> by means of another inter-unit signal via the inter-unit communication section <NUM>. Here, the "rest usage-side unit <NUM>" means the other usage-side unit <NUM> which has not originated nor received the information that the inter-unit signal processing section <NUM> received.

The unit controller <NUM> may also be configured to operate according to commands from the heat-source-side unit <NUM>, and send information relating to the usage-side unit <NUM> to the heat-source-side unit <NUM>.

With the above configuration, the unit controller <NUM> can originate alarm information including ID information, share alarm information with the other the unit controller <NUM> and the connecting indicator <NUM> regardless of the origin of the alarm information. The unit controller <NUM> can also differentiate alarm information originated by itself and other alarm information from each other by using a first unit signal for the former alarm information and a second unit signal for the latter alarm information.

The difference of a first unit signal and a second unit signal is not limited to a certain form, but need to be shared between the usage-side unit <NUM> and the connecting indicator <NUM> in advance such that the indicator <NUM> can distinguish them. For instance, a first unit signal and a second unit signal are: transmitted using predetermined different commands; transmitted in predetermined different timings in a transmission frame; and/or appended with predetermined different symbols. The indicator <NUM> may request the connecting usage-side unit <NUM> to send information to the indicator <NUM> specifying the origin of the information. In this case, the transmitted signal in reply to the request specifying the connecting usage-side unit <NUM> may be a first unit signal, and the transmitted signal in reply to the request not specifying the connecting usage-side unit <NUM> may be a second unit signal.

<FIG> is a block diagram indicating a functional configuration of the indicator <NUM>.

As shown in <FIG>, the indicator <NUM> includes a terminal-side communication section <NUM>, a unit-side communication section <NUM>, an indicator input section <NUM>, an indicator output section <NUM>, an indicator storage section <NUM>, and an indicator control section <NUM>.

The terminal-side communication section <NUM> is configured to establish the communication path <NUM> with the mobile terminal <NUM> to communicate therewith (see <FIG>). In particular, the terminal-side communication section <NUM> is configured to receive terminal signals from the mobile terminal <NUM>. The terminal-side communication section <NUM> may be a short-range radio communication interface device.

The unit-side communication section <NUM> is configured to establish the communication path <NUM> with the unit controller <NUM> (a predetermined usage-side unit) to communicate therewith (see <FIG>). In particular, the unit-side communication section <NUM> is configured to transmit indicator signals to the unit controller <NUM>, and receive or acquire first and second unit signals from the unit controller <NUM>. The system-side communication section <NUM> may be a LAN interface.

The indicator input section <NUM> is configured to receive user operations to the indicator <NUM>. The indicator input section <NUM> may be a mechanical key, a mechanical dial, a touch panel, a microphone, or the like. The indicator input section <NUM> may include the above-mentioned on/off button <NUM> and/or operation area <NUM> (see <FIG>).

The indicator output section <NUM> is configured to output information provided from the indicator control section <NUM> by a visual image and/or a sound. The information to be outputted includes alarm information and status information. The indicator output section <NUM> may be a loudspeaker, a display device, an electric light, a vibrator, or the like. The indicator output section <NUM> may include the above-mentioned display area <NUM>, loudspeaker <NUM>, and/or LED <NUM>.

The indicator storage section <NUM> stores information in a form readable and rewritable by the indicator control section <NUM>. The information to be stored includes mode setting information that indicates which of a plurality of predetermined operation modes has been set to indicator <NUM>. In the different predetermined operation modes, the indicator <NUM> behaves in different manners.

In this embodiment, the predetermined operation modes includes a first mode, a second mode, and a third mode. The first mode is an operation mode for outputting information from the indicator <NUM> regardless of the origin of the information. The second mode is an operation mode for outputting only alarm information originated by the connecting unit controller <NUM>. The third mode is an operation mode for outputting only information originated by the connecting unit controller <NUM>. However, the predetermined operation modes are not limited to these modes. For instance, the predetermined operation modes may include only the first and second modes, or only the first and third modes. The indicator storage section <NUM> may store mode setting information indicating the third mode as an initial operation mode which has been set to the indicator storage section <NUM> in advance.

The indicator control section <NUM> is configured to control the communications with the connecting unit controller <NUM> and the communications with the mobile terminal <NUM>, and the operations of the indicator <NUM>. The indicator control section <NUM> may be achieved by an application software installed to or updated in the indicator <NUM>. The indicator control section <NUM> includes a terminal signal processing section <NUM>, a mode management section <NUM>, and a unit signal processing section <NUM>.

The terminal signal processing section <NUM> is configured to receive terminal signals transmitted from the mobile terminal <NUM> via the terminal-side communication section <NUM>, and process the received indicator signals. More specifically, terminal signal processing section <NUM> is configured to, when mode information has been received by means of a terminal signal, pass it to the mode management section <NUM>. The mode information is information indicating a request on a selection from the above-mentioned predetermined operation modes, i.e. which of the first to third modes should be set to the indicator <NUM>.

In addition, the terminal signal processing section <NUM> is configured to, when any one of the operation information, the address information, and the indication information has been received by means of a terminal signal, transfer it to the connecting unit controller <NUM> by means of an indicator signal via the terminal-side communication section <NUM>.

The mode management section <NUM> is configured to accept selection from the above-mentioned predetermined operation modes of the indicator <NUM>. More specifically, the mode management section <NUM> is configured to, when the mode information is received from the terminal signal processing section <NUM>, rewrite the mode setting information stored in the indicator storage section <NUM> or add the mode setting information to the indicator storage section <NUM> as indicated by the received mode information. Thereby, the mode management section <NUM> sets the operation mode to the indicator <NUM> according to the received mode information. For instance, the received mode information indicates the first mode, the mode management section <NUM> sets the first mode to the indicator <NUM>. The mode management section <NUM> may also accept the request on the operation mode selection from the user <NUM> via the indicator input section <NUM> (see <FIG>).

The unit signal processing section <NUM> is configured to receive or acquire unit signals, which include the first and second unit signals mentioned above, transmitted from the connecting unit controller <NUM> via the unit-side communication section <NUM>, and process the received unit signals. More specifically, the unit signal processing section <NUM> is configured to, when information has been received by means of any one of first and second unit signals, pass it to the indicator output section <NUM> such that the information is outputted. Meanwhile, the unit signal processing section <NUM> is also configured to regulate information output from indicator output section <NUM> such that only information necessary for the indicator <NUM> is outputted therefrom.

<FIG> is a schematic table indicating operation patterns of the indicator <NUM> upon receiving a signal from the unit controller.

As shown in the schematic table <NUM> of <FIG>, the unit signal processing section <NUM> switches its behaviour depending on: which of first unit signal and second unit signal has been received; whether the information indicated by the received unit signa is alarm information; and which of the first to third modes has been set to the indicator <NUM>.

When the indicator <NUM> is operating in the first mode, the unit signal processing section <NUM> is configured to restrain information indicated by a received second unit signal and information which is not alarm information (hereinafter referred to as "non-alarm information") from being outputted by the indicator output section <NUM>. On the other hand, if the received signal indicates alarm information, the unit signal processing section <NUM> allows the indicator output section <NUM> to output the alarm information regardless of whether the received signal is a first unit signal or a second unit signal.

When the indicator <NUM> is operating in the second mode, the unit signal processing section <NUM> is configured to restrain the information which is indicated by a second unit signal and non-alarm information from being outputted by the indicator output section <NUM>. On the other hand, if the received signal is a first unit signal indicating alarm information, the unit signal processing section <NUM> allows the indicator output section <NUM> to output the alarm information.

When the indicator <NUM> is operating in the third mode, the unit signal processing section <NUM> is configured to restrain the information which is indicated by a second unit signal from being outputted by the indicator output section <NUM>. On the other hand, if the received signal is a first unit signal, the unit signal processing section <NUM> is configured to operate according to information indicated by a first unit signal. For example, the unit signal processing section <NUM> allows the indicator output section <NUM> to output alarm information and status information indicated by a first unit signal.

In other words, the unit signal processing section <NUM> is configured to, when alarm information has been received or acquired by means of a second unit signal during the indicator <NUM> is operating in the first mode, or when alarm information has been received or acquired by means of a first unit signal, allows the indicator output section <NUM> to output the alarm information. Consequently, the indicator output section <NUM> is configured to output information indicated by a unit signal received or acquired from the usage-side unit <NUM>, on condition that the unit signal is a second unit signal indicating alarm information and has been received or acquired during the indicator <NUM> is operating in the first mode, or that the unit signal is a first unit signal indicating alarm information. The unit signal processing section <NUM> may determine which mode has been set to the indicator <NUM> (i.e. in which mode the indicator <NUM> is operating) by referring to the mode setting information stored in the indicator storage section <NUM>.

With the above configuration, the operation mode of the indicator <NUM> can be switched as desired among the first mode in which alarm information is outputted regardless of its origin, the second mode in which only alarm information originated by the connecting unit controller <NUM> is outputted, and the third mode in which only information originated by the connecting unit controller <NUM> is outputted. For instance, the first mode is suitable for the supervisor-use indicator 400_S, the third mode is suitable for the first and second indicators 400_1, 400_2, and the second mode is suitable for the indicator <NUM> (not shown) additionally connected to the first unit controller 300_1 or the second unit controller 300_2 (see <FIG>).

<FIG> is a block diagram indicating a functional configuration of a mobile terminal shown in <FIG>.

As shown <FIG>, the mobile terminal <NUM> includes a terminal communication section <NUM>, a terminal input section <NUM>, and a terminal control section <NUM>.

The terminal communication section <NUM> is configured to establish the communication path <NUM> with the indicator <NUM> to communicate therewith (see <FIG>). In particular, the terminal communication section <NUM> is configured to transmit terminal signals to the indicator <NUM>. The terminal communication section <NUM> may be further configured to receive signals from the indicator <NUM>. The terminal communication section <NUM> may be a short-range radio communication interface device.

The terminal input section <NUM> is configured to receive user operations to the mobile terminal <NUM>. The terminal input section <NUM> may be a touch panel display, mechanical keys, a microphone, or the like.

The terminal control section <NUM> is configured to receive requests relating to the heat-pump system <NUM> from the user <NUM> via terminal input section <NUM>, and send information according to the received request to the indicator <NUM> by a terminal signal via the terminal communication section <NUM>.

More specifically, when a request for setting one of the predetermined operation modes to the indicator <NUM> has been received, the terminal control section <NUM> is configured to send mode information indicating the request. When a request for setting selected or inputted address information to be set to the user-side unit <NUM> has been received, the terminal control section <NUM> is configured to send address information indicating the request. When a request for controlling the operation of the usage-side unit <NUM> in a certain manner has been received, the terminal control section <NUM> is configured to send operation information indicating the request. When a request for outputting certain information on the operation of the usage-side unit <NUM>, the terminal control section <NUM> is configured to send operation information indicating the request. The terminal control section <NUM> may also be configured to output or response to signals received from the indicator <NUM>. The terminal control section <NUM> may be achieved by an application software installed to or updated in the mobile terminal <NUM>.

With the above configuration, the mobile terminal <NUM> can send information for controlling operations of the usage-side unit <NUM> and the indicator <NUM> according to the operation by the user <NUM>. Thus, the mobile terminal <NUM> allows the user <NUM> to select the operation mode of the indicator <NUM>, change the ID information of the usage-side unit <NUM>, control the operation of the usage-side unit <NUM>, and know the operation status of the usage-side unit <NUM>. As a result, human interfaces of the indicator <NUM> can be simplified, and the user <NUM> can make the above operations without touching the indicator <NUM>.

It is preferable that there are two types of the terminal control section <NUM>. The first type is for a supervisory use and configured to send at least the mode information and the address information among the above information. The first type is for a private use and configured to send at least the operation information and the indication information among the above information. In this case, it is also preferable that the terminal control section <NUM> can be switched between these types only by authorized people or authorized devices.

<FIG> is a flow chart indicating a process performed by the communication control section <NUM> of the unit controller <NUM>.

In step S1010, the indicator signal processing section <NUM> determines whether an indicator signal has been received. If an indicator signal has been received (S1010: Yes), the indicator signal processing section <NUM> proceeds to step S1020, and if not (S1010: No), proceeds to later-mentioned step <NUM>.

In step S1020, the indicator signal processing section <NUM> determines whether the received indicator signal indicates address information. If address information is indicated (S1020: Yes), the indicator signal processing section <NUM> proceeds to step S1030, and if not (S1020: No), proceeds to later mentioned step <NUM>. In step <NUM>, the indicator signal processing section <NUM> sets the indicated address information as ID information of the usage-side unit <NUM>.

In step S1040, the indicator signal processing section <NUM> determines whether the received indicator signal indicates operation information. If operation information is indicated (S1040: Yes), the indicator signal processing section <NUM> proceeds to step S1050, and if not (S1040: No), proceeds to later-mentioned step <NUM>. In step <NUM>, the indicator signal processing section <NUM> passes the indicated operation information to the operation control section <NUM> so as to control the usage-side unit <NUM> according to the operation information.

In step S1060, the indicator signal processing section <NUM> determines whether the received indicator signal indicates indication information. If indication information is indicated (S1060: Yes), the indicator signal processing section <NUM> proceeds to step S1070, and if not (S1060: No), proceeds to later-mentioned step <NUM>. Before proceeding to step <NUM>, the indicator signal processing section <NUM> may execute a certain process based on the received indicator signal. In step <NUM>, the indicator signal processing section <NUM> passes the indicated indication information to the information originating section <NUM> so as to originate status information of the usage-side unit <NUM> and send it to the indicator <NUM> by a first unit signal.

In step S1080, the inter-unit signal processing section <NUM> determines whether an inter-unit signal has been received. If an inter-unit signal has been received (S1080: Yes), the inter-unit signal processing section <NUM> proceeds to step S1090, and if not (S1080: No), proceeds to later-mentioned step <NUM>. In step S1090, the inter-unit signal processing section <NUM> transfers information indicated by the received inter-unit signal to the indicator <NUM> by means of a second unit signal. If there is the rest usage-side unit <NUM>, the inter-unit signal processing section <NUM> transfers the same information to the rest usage-side unit <NUM> as well.

In step S1100, the information originating section <NUM> determines whether alarm information need to be outputted, e.g. whether an abnormality such as a refrigerant leakage has occurred in the usage-side unit <NUM>. If alarm information need to be outputted (S1100: Yes), the information originating section <NUM> proceeds to step S1110, and if not (S1100: No), proceeds to later-mentioned step <NUM>. In step S1110, the information originating section <NUM> originates alarm information. In other words, the information originating section <NUM> sends alarm information including the ID information of the usage-side unit <NUM> to the indicator <NUM> by a first unit signal, and send the same information to the other unit controller <NUM> (the other usage-side unit <NUM>).

The information originating section <NUM> may execute other process depending on the type of the occurred abnormality. For instance, when a refrigerant leakage has occurred, the information originating section <NUM> may control the operation control section <NUM> to shut off refrigerant valves (not shown) of the usage-side unit <NUM>, output a flash or a buzzer from the usage-side unit <NUM>, and/or send a request to the heat-source-side unit <NUM> to stop its operation.

In step S1120, the communication control section <NUM> determines whether a termination of operation has been designated. The designation may be made by a user operation, another device, or the communication control section <NUM> itself. If the termination of the operation has not been designated (S1120: No), the communication control section <NUM> proceeds back to step S1010, and if designated (S1120: Yes), terminates its operation.

By the above process, the usage-side unit <NUM> can properly and swiftly react to signal receptions and abnormality occurrences. It should be noted that the execution order of above-mentioned steps S1010 to S1070, steps S1080 and S1090, and steps S1100 and S1110 may be changed. The execution order of the execution order of steps S1020 and S1030, steps S1040 and S1050, and steps S1060 and S1070 may also be changed.

<FIG> is a flow chart indicating a process performed by the indicator control section <NUM> of the indicator <NUM>.

In step S2010, the terminal signal processing section <NUM> determines whether a terminal signal has been received. If a terminal signal has been received (S2010: Yes), the terminal signal processing section <NUM> proceeds to step S2020, and if not (S2010: No), proceeds to later-mentioned step <NUM>.

In step S2020, the terminal signal processing section <NUM> determines whether the received terminal signal indicates mode information. If mode information is indicated (S2020: Yes), the terminal signal processing section <NUM> proceeds to step S2030, and if not (S2020: No), proceeds to later mentioned step <NUM>. In step <NUM>, the terminal signal processing section <NUM> passes the indicated mode information to the mode management section <NUM> so as to set the operation mode of the indicator <NUM> as requested by the mode information. In other words, the indicator <NUM> accepts, from the user <NUM>, selection from the plurality of operation modes of the indicator <NUM>.

In step S2040, the terminal signal processing section <NUM> determines whether the received terminal signal indicates one of address information, operation information, and indication information. If any one of them is indicated (S2040: Yes), the terminal signal processing section <NUM> proceeds to step S2050, and if not (S2040: No), proceeds to later-mentioned step <NUM>. Before proceeding to step <NUM>, the terminal signal processing section <NUM> may execute a certain process based on the received terminal signal. In step <NUM>, the terminal signal processing section <NUM> transfers the indicated information to the usage-side unit <NUM>.

In step S2060, the unit signal processing section <NUM> determines whether a first unit signal has been received. If a first unit signal has been received (S2060: Yes), the unit signal processing section <NUM> proceeds to step S2070, and if not (S2060: No), proceeds to later-mentioned step <NUM>.

In step S2070, the unit signal processing section <NUM> determines whether the received first unit signal indicates alarm information. If alarm information is indicated (S2070: Yes), the unit signal processing section <NUM> proceeds to later-mentioned step S2120, and if not (S2070: No), proceeds to step <NUM>. In step <NUM>, the unit signal processing section <NUM> determines whether the indicator <NUM> is operating in any one of the first mode and the second mode. If the indicator <NUM> is operating in any one of the first mode and the second mode (S2080: Yes), the unit signal processing section <NUM> proceeds to later-mentioned step S2100, and if not (S2080: No), proceeds to step S2090.

In step <NUM>, the unit signal processing section <NUM> determines whether the received first unit signal indicates status information. If status information is indicted (S2090: Yes), the unit signal processing section <NUM> proceeds to later-mentioned step S2120, and if not (S2080: No), proceeds to step S2100. Before proceeding to step <NUM>, the unit signal processing section <NUM> may execute a certain process based on the received first unit signal.

In step S2100, the unit signal processing section <NUM> determines whether a second unit signal has been received. If a second unit signal has been received (S2100: Yes), the unit signal processing section <NUM> proceeds to step S2110, and if not (S2100: No), proceeds to later-mentioned step <NUM>.

In step S2110, the unit signal processing section <NUM> determines whether the received second unit signal indicates alarm information and the indicator <NUM> is operating in the first mode. If alarm information is indicated and the indicator <NUM> is operating in the first mode (S2110: Yes), the unit signal processing section <NUM> proceeds to step S2120, and if not (S2110: No), proceeds to later mentioned step S2130. Before proceeding to step <NUM>, the unit signal processing section <NUM> may execute a certain process based on the received second unit signal.

In step S2120, the unit signal processing section <NUM> passes the indicated information to the indicator output section <NUM> so as to output the information from the indicator <NUM>. In other words, when alarm information has been received or acquired by means of a first unit signal, when a first unit signal indicating status information has been received or acquired during the indicator <NUM> is operating in the third mode, and when alarm information has been received or acquired by means of a second unit signal during the indicator <NUM> is operating in the first mode, the indicator <NUM> outputs the information.

In step S2130, the indicator control section <NUM> determines whether a termination of operation has been designated. The designation may be made by a user operation, another device, or the indicator control section <NUM> itself. If the termination of the operation has not been designated (S2130: No), the indicator control section <NUM> proceeds back to step S2010, and if designated (S2130: Yes), terminates its operation.

By the above process, the indicator <NUM> can properly and swiftly react to signal receptions, in particular, properly regulate its information output. It should be noted that the execution order of above-mentioned steps S2010 to S2050, steps S2060 to S2090, and steps S2100 and S2110 may be changed. Moreover, the execution order of the above-mentioned steps S2020 and S2030, and steps S2040 and S2050 may also be changed.

The terminal control section <NUM> of the mobile terminal <NUM> repeatedly determines whether the requests on the heat-pump system <NUM> mentioned above has been inputted by the user <NUM>, and transmits, when the request has been inputted, the corresponding information to the indicator <NUM>, including mode information, address information, operation information, and indication information. Thereby, the mobile terminal <NUM> can properly and swiftly make a request according to intentions of the user <NUM>, in particular, properly select the operation mode of each indicator <NUM> and set ID information to each usage-side unit <NUM>.

<FIG> is a sequential diagram indicating an example of an operation the heat-pump system <NUM>.

As shown in <FIG>, the second mode is set to the indicators 400_S, 400_1, 400_2 and ID information "<NUM>" is set to the usage-side units 220_1, 200_2 for instance. When a request of setting the first mode is made in the mobile terminal <NUM> when it is in the vicinity of the supervisor-use indicator 400_S (S4110), the mobile terminal <NUM> send mode information indicating the first mode to the supervisor-use indicator 400_S (S4120). As a result, the supervisor-use indicator 400_S sets the first mode to itself (S4130).

Then, when the mobile terminal <NUM> is brought to the vicinity of the second indicator 400_2 and a request of setting an address "<NUM>" is made in the mobile terminal <NUM> (S4210), the mobile terminal <NUM> sends address information indicating the address "<NUM>" to the second indicator 400_2 (S4220). The second indicator 400_2 (S4220) transfers this address information to the second usage-side unit 220_2 (S4230), and the second usage-side unit 220_2 sets the address "<NUM>" as its new ID information (S4240). These steps S4110 to S4240 belong to a setting phase of the heat-pump system <NUM> for achieving appropriate information output.

After the above setting phase, if an abnormality has occurred in the second usage-side unit 220_2 (S4310), the second usage-side unit 220_2 originates alarm information and send it to the second indicator 400_2 by a first unit signal, and to the first usage-side unit 220_1 by an inter-unit signal (S4320). As a result, the second indicator 400_2 outputs a buzzer and displays the text "<NUM>" (S4320), because the alarm information has been indicated by a first unit signal.

The first usage-side unit 220_1 transfers the alarm information to the first indicator 400_1 and the supervisor-use indicator 400_S by second unit signals (S4340). However, the first indicator 400_1 does not output a buzzer nor display the text "<NUM>" (S4350), because the alarm information has been indicated by a second unit signal and the first indicator 400_1 is operating in the second mode. Meanwhile, the supervisor-use indicator 400_S outputs a buzzer and displays the text "<NUM>" (S4360), because the supervisor-use indicator 400_S is operating in the first mode. These steps S4310 to S4360 belong to a use phase the heat-pump system <NUM> for outputting information when necessary.

Accordingly, the indicator <NUM> can behave in different ways to output information depending on which operation mode is set and whether the information has been originated by the connecting usage-side unit <NUM>.

<FIG> are plan views of the indicator <NUM> showing examples of a display state thereof.

When the indicator <NUM> is not operating or has not received any information, it displays no information as shown in <FIG>. When the indicator <NUM> has received status information such as a target temperature by a first unit signal, it displays the received information as shown in <FIG>. When the indicator <NUM> operating in the first mode has received alarm information, it displays the received information as shown in <FIG> if the originating usage-side unit <NUM> maintains the ID information as initially set. On the other hand, if the originating usage-side unit <NUM> has changed its ID information based on the address information, the new ID information is displayed as shown in <FIG>.

Hence, the ID information to be displayed in the indicators <NUM> can be changed as desired by the user <NUM>. This helps the user <NUM> as a monitoring person of the heat-pump system <NUM> to grasp the relationship between the displayed alarm information and the usage-side unit <NUM> which is the origin of the alarm information. For instance, it is allowed to the user <NUM> to swiftly know in which usage-side unit <NUM> an abnormality has occurred.

It should be noted that a plurality of the usage-side units <NUM> may form a unit group in which the usage-side units <NUM> operate in the same manner or cooperating manner. In such a unit group, a plurality of the indicators <NUM> may include a main usage-side unit <NUM> which represents the unit group to originate alarm information towards the outside of the unit group and transfer alarm information from the outside of the unit group. In this case, the ID information change may be necessary for only the main usage-side unit <NUM>. In general, the usage-side units <NUM> initially have sequential serial numbers within the unit group as their ID information. Thus, the indicator <NUM> connected to the usage-side unit <NUM> other than the main usage-side unit <NUM> may display such initial ID information as shown in <FIG>, while the supervisor-use indicator 400_S displays the new ID information of the main usage-side unit <NUM> as shown in <FIG>. When this indicator <NUM> is activated in the first mode, it may display an alarm mark as shown in <FIG>.

According to the heat-pump system <NUM>, it is possible to output alarm information originated by one of the usage-side units <NUM> from only the indicator <NUM> directly connecting to the usage-side units <NUM> which originated the alarm information and the other arbitrarily selected indicator <NUM>. Moreover, such a regulated information output can be achieved without providing any information output device having a different configuration from the indicators <NUM>. Hence, the manageability and usability of the refrigerant system <NUM> can be improved at a low cost.

The abnormalities which trigger alarm information are not limited to the above-mentioned abnormalities. For instance, abnormalities in the heat-source-side unit <NUM> may also trigger origination of alarm information. Such abnormalities may include a case where discharge temperature of a refrigerant compressor (not shown) of the heat-source-side unit <NUM> has exceeded a predetermined value, a case where rotational speed of the refrigerant compressor has exceeded a predetermined value, or the like. In this case, any one of the heat-source-side unit <NUM> and the usage-side units <NUM> may detect occurrence of the abnormality to originate alarm information. In any case, the originating unit should originate alarm information indicating the heat-source-side unit <NUM> as a location of the abnormality has occurred. The indicator <NUM> outputs the alarm information to indicate that an abnormality has occurred in the heat-source-side unit <NUM>. It is preferable that only the indicator <NUM> which is operating in the first mode outputs such alarm information.

Claim 1:
An indicator (<NUM>) for outputting information relating to a heat-pump system (<NUM>) including a plurality of usage-side units (<NUM>) which form a communication network, comprising:
a mode management section (<NUM>) configured to accept selection from a plurality of operation modes of the indicator including a first mode; and
an indicator output section (<NUM>) configured to output information,
characterized by:
a unit-side communication section (<NUM>) configured to receive or acquire first and second unit signals from a predetermined usage-side unit which is one of the usage-side units, the first unit signal being used for information originated by the predetermined usage-side unit, the second unit signal being used for information not originated by the predetermined usage-side unit; and
a unit signal processing section (<NUM>) configured to, when information has been received or acquired by means of a second unit signal during the indicator is not operating in the first mode, restrain the information from being outputted by the indicator output section,
wherein
the indicator output section is configured to,
when alarm information has been received or acquired by means of a second unit signal during the indicator is operating in the first mode, output the alarm information, and,
when alarm information has been received or acquired by means of a first unit signal, output the alarm information.