JP2661299B2 - Air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a duct type air conditioner employing a variable air volume control system capable of independently adjusting the room temperature of each room, and in particular, to a duct resistance of the duct type. The present invention relates to an air conditioner that detects a difference and estimates an air volume of a terminal duct.

2. Description of the Related Art As a conventional variable air volume control type air conditioner, there is an air conditioner that distributes cool air or hot air to each room via a duct by a blower. However, the branch ducts branched into the respective rooms usually have different lengths from the branch point to the respective rooms, and the airflow resistances of the respective branch ducts have respective differences. In addition, the ventilation resistance of each duct is also affected by defects in the duct installation work, for example, deformation such as distortion of the duct cross-sectional shape, or the presence of foreign matter in the duct.

In this state, especially in the latter case, if the pressure of the common air passage, that is, the pressure at the root of the duct is detected to control the drive of the blower, the difference in pressure loss on the downstream side will be ignored. , Precise ventilation control for each room,
Consequently, room temperature cannot be controlled.

The conventional example described below detects the pressure at the base of the duct before being blown to each room, and controls the drive of the blower.

As a specific example representative of these conventional examples, see FIG. 2 ・ 10 described in Chapter 2 of the Refrigeration and Air Conditioning Handbook issued by the Japan Refrigeration Association (New Edition, 4th Edition Application), page 41 of the air conditioning system.
(A) is selected and the operation of the conventional example will be described.

FIG. 5 is a block diagram showing a conventional air conditioner described in the aforementioned refrigeration / air conditioning handbook.

In the figure, (1) is an air-conditioned room to be air-conditioned, and this figure shows a case of four rooms. (2) an indoor unit disposed in the ceiling of the room to be air-conditioned (1) or the like and functioning as a cooling air or hot air blowing source, and (3) an air filter for purifying air by removing dust and the like in the air. , (4) is a heat exchanger that cools or heats air, and (5) is a blower that blows cold or hot air. The indoor unit (2) includes an air filter (3), a heat exchanger (4), and a blower (5).
It is composed of (6) is a main duct communicating with the air outlet of the indoor unit (2), (7) is a branch duct branched from the main duct (6) according to the number of the air-conditioned rooms (1),
(8) is a throttle type ventilation adjustment unit which is attached to each branch duct (7) and adjusts the air volume to each air-conditioned room (1). (9) is inside the throttle type ventilation adjustment unit (8). (10) is an outlet located at the end of the branch duct (7), and (11) is a suction port provided below a door of the room to be air-conditioned (1). , (12) is a ceiling suction port provided on the ceiling surface of the corridor outside the room to be air-conditioned (1), and (13) is a suction port communicating with the ceiling suction port (12) and the suction port of the indoor unit (2). It is a duct. (14) A room thermostat for setting and detecting the room temperature installed in each room to be air-conditioned (1), and (15) a temperature detector for detecting the temperature of air blown from the blower (5) in the main duct (6). , (16) are pressure detectors for detecting wind pressure generated by the blower (5) in the main duct (6), and (17) is a heat exchanger (4).
And a heat source device such as a heat pump that controls the heat conversion operation in the heat exchanger (4).

The conventional duct type air conditioner for centralized cooling and heating is configured like steam, and the air cooled or heated by the heat exchanger (4) is converted into cool air or hot air by the blower (5) and the duct (6) and the air. And / or centralized ventilation means for distributing and blowing air into each of a plurality of air-conditioned rooms (1) via branch ducts (7), and each of the air-conditioned rooms (1) attached to each branch duct (7) portion Damper (9)
And a throttle-type air-blowing adjustment unit (8) as air-blowing adjusting means for adjusting by opening and closing.

Next, the operation of the conventional air conditioner having the above configuration will be described.

First, the opening degree of the damper (9) of the throttle-type ventilation adjustment unit (8) according to the temperature difference between the set temperature set by the user or the like in each room thermostat (14) and the current actual room temperature detected. Is adjusted to an arbitrary position. The pressure in the main duct (6) also changes according to the degree of opening of the damper (9). This change in pressure is detected by the pressure detector (16), and the blowing capacity of the blower (5) is adjusted so as to be a preset pressure. Further, since the blast temperature at the outlet side of the heat exchanger (4) also changes with the change in the blast volume, the temperature detector (15) detects this change and sets the heat source ( 17) control the ability.

By such a series of controls, an appropriate amount of appropriate temperature air adjusted to a substantially constant temperature is blown from the air outlet (10) into the room to be air-conditioned (1). In other words, the air is blown at an air volume according to the magnitude of the heat load in each air-conditioned room (1). The air conditioned inside the room to be air-conditioned (1) flows into the ceiling suction port (12) from the suction port (11) through a space such as a corridor, and flows into the suction duct (13).
And returns to the indoor unit (2) again. Then, the same flow is repeated again according to the above operation.

As described above, in the duct type air conditioner for centralized cooling and heating using the conventional general throttle type air conditioning unit (8), the air conditioner according to the fluctuation of the heat load in each air-conditioned room (1). The optimum values of the blowing temperature and the blowing pressure are determined, and the capacities of the heat source device (17) and the blowing device (5) are appropriately controlled so that these values become substantially constant.

[Problem to be Solved by the Invention] In the conventional air conditioner as described above, the amount of air blown by the blower (5) is controlled using the pressure change in the main duct (6) during blowing as a control index. Was.

However, in controlling the blowing capacity of the blower (5) using the root pressure as a control index so as to keep the root pressure of the main duct (6) constant, the blowing resistance of each branch duct is different, so that each branch duct is different. , That is, the amount of air supplied to each air-conditioned room (1) could not be properly maintained.

In addition, in the case where there is a ventilation failure in the branch duct due to a defect in the duct installation work, for example, deformation such as distortion of the tact cross-sectional shape, or the presence of foreign matter in the duct, each of the air-conditioned rooms (1). It was particularly difficult to properly maintain the amount of air supplied to the system.

A device that does not use the pressure change in the main duct (6) as a control index as described above has been disclosed in Japanese Patent Publication No. 60-47497. This is to control the blower (5) and the like by providing the terminal air volume control unit of each outlet with a function as a wind speed sensor. In this device, when the damper (9) is fully opened and the blower adjusting unit having the most inferior blowing condition outputs an output less than or equal to the set airflow, the airflow of the blower (5) is adjusted based on the output. The blower (5) was always controlled to the minimum required capacity.

However, in the technology disclosed in the above-mentioned publication, although an appropriate air volume can be obtained at each outlet, each terminal air volume control unit and the like become large and extremely expensive due to the presence of the wind speed sensor. Usually, the number of terminals of this type of air conditioner is about 5 to 15, and the price is extremely important.

Therefore, an object of the present invention is to provide an air conditioner that can appropriately control the capacity of a blower with a simple configuration and means.

[Means for Solving the Problems] An air conditioner according to the present invention provides a plurality of air-conditioned rooms through a main duct and a branch duct as air cooled or heated by a heat exchanger as cool air or hot air. Centralized air blowing means for distributing and blowing air into a room, air blowing adjusting means mounted on each of the branch ducts to adjust the amount of cold air or hot air to each of the air-conditioned rooms by opening and closing dampers, and a damper for the air blowing adjusting means In the test operation mode, the opening / closing of the damper is controlled by changing the degree of opening / closing for each unit and completely closing the other, and the amount of air blown from the blower is detected by an air volume detector, and the actual air volume is measured. Air volume measuring means, pressure difference measuring means for detecting a pressure difference between an outlet air pressure and an inlet air pressure of the centralized blowing means with a pressure difference detector, and measuring a blowing pressure difference with respect to an actual duct system, and the pressure difference measuring means And wind Based on the outputs of the volume measuring means and the damper control means, calculate the correlation between the amount of air passing through each of the air flow adjusting means, the degree of opening / closing of the damper, and the air pressure difference, and perform air flow control for obtaining air flow resistance in each duct. Air volume calculation means for calculating initial setting information, initial setting information obtaining means for obtaining the initial setting information comprising the damper control means, pressure difference detector, pressure difference measuring means, and air volume calculating means; and Initial setting information storage means for storing, detecting in advance the difference in air path resistance of each duct, indirectly estimating the air volume of each terminal air volume control unit, the blowing pressure difference with respect to the set air volume and the damper of the damper The degree of opening and closing is determined.

[Operation] In the air conditioner of the present invention, in the test operation mode, the damper control means changes the degree of opening and closing for each of the dampers of the air blowing adjusting means and completely closes the other damper, and the air blower at this time is closed. The air volume is measured by the air volume measuring unit by the air volume detector, and the pressure difference between the outlet air pressure and the inlet air pressure of the centralized air blowing unit is measured by the pressure difference detector by the pressure difference measuring unit. Then, the air volume calculation means calculates these relations from the damper opening / closing information by the damper control means, the air volume information by the air volume measurement means, and the blowing pressure difference information by the pressure difference measurement means, and forms or tabulates these relationships. This series of operations is performed by the initial setting information acquisition means by the number of the air blowing adjustment means. In order to blow a predetermined air volume to each branch duct or the like, how to control the air blowing pressure difference and the degree of opening / closing of the damper of the air blowing adjusting means. The information of the fish is sequentially stored in the initial setting information storage means as initial setting information. On the other hand, in the actual operation mode, the degree of opening and closing of the blower and the damper of the blower adjusting means is appropriately controlled based on the information stored in the initial setting information storage means, and an appropriate amount of cold air or hot air is supplied to each air-conditioned room. Supply properly according to the set air volume.

Embodiment FIG. 1 is a configuration diagram showing an entire system of an air conditioner according to an embodiment of the present invention. In the figure, (2),
(4) to (7), (9) and (16) are the same as or correspond to the components of the above-described conventional example, and therefore, duplicate description will be omitted here. In addition, similarly to the conventional example, this air conditioner converts a plurality of air cooled or heated by the heat exchanger (4) into a cool air or a hot air by a blower (5) through a duct (6) and a branch duct (7). A centralized air blowing means for distributing and blowing air into each room of the air-conditioned room (1), and a damper (a) which is attached to each of the branch ducts (7) and sends a flow of cold air or hot air to each of the air-conditioned rooms (1). And 9) a blower adjusting means for adjusting by opening and closing. Since a normal operation control operation based on the operation mode of the air conditioner has been conventionally known, the test operation mode of the air conditioner will be described here.

In FIG. 1, (18) is a pressure difference detector for detecting a pressure difference between an outlet air pressure and an inlet air pressure of an indoor unit (2) comprising a heat exchanger (4) and a blower (5) functioning as a centralized blowing means. , (19) are air volume detectors disposed at the root of the main duct (6), and detect the air volume from the blower (5). (20) is a damper (9) for each air flow adjustment means
This is a damper control means for controlling the opening degree. Driving mechanisms (not shown) for individually opening and closing the dampers (9) are connected to the dampers (9), and each of the driving mechanisms is operated in response to an opening signal from the damper control means (20). To control the opening of the corresponding damper (9). (21) is an air volume measuring means for measuring an actual air volume based on a detection signal of the air volume detector (19). (22) is a pressure difference detector (1
This is a pressure difference measuring means for measuring the actual blowing pressure difference based on the detection signal of 8). (23) is the pressure difference measuring means (2
2) an air flow calculating means for calculating the relationship between the air flow passing through the air flow adjusting means, the degree of opening / closing of the damper (9), and the air pressure difference based on the outputs of the air flow measuring means (21) and the damper control means (20). The air flow calculating means (23) receives the measured air flow output from the air flow measuring means (21), the measured pressure difference output from the pressure difference measuring means (22), and the damper opening information output from the damper control means (20). Then, these relationships are calculated and evaluated, and tabulated or formulated initial setting information is generated. (24) is an initial setting information storage means, which stores initial setting information of air blowing control for obtaining air blowing resistance in each duct calculated by the air volume calculating means (23). Further, (25) is an initial setting information acquisition means consisting of a damper control means (20), a pressure difference detector (18), a pressure difference measurement means (22) and an air volume calculation means (23) necessary only for the test operation. The initial setting information acquiring means (25) has a detachable structure.

Here, an example of the function and operation of the air volume calculation means (23) of the air conditioner configured as described above will be described with reference to FIG. FIG. 2 is a blowing characteristic diagram showing a relationship between a landscape of a blower used in an air conditioner according to an embodiment of the present invention and a blowing pressure difference.

In FIG. 2, the vertical axis represents the blower pressure difference P obtained from the pressure difference between the outlet air pressure and the inlet air pressure of the indoor unit (2) by the blower (5), the horizontal axis represents the air volume Q, and the solid line represents the characteristic curve of the blower (5). The broken line is a resistance curve showing the airflow resistance of the branch duct (7) and the like reaching the predetermined damper (9). The parameter indicated by the broken line is the opening D of each damper (9). In addition, the blowing characteristic curve of the solid line shows the case where the rotation speed of the blower (5) is fixed at a predetermined rotation speed. Further, the resistance curve indicating the airflow resistance of the branch duct (7) and the like changes as shown in the figure depending on the opening degree D of the damper (9).

By using this characteristic diagram, the opening degree D of the damper (9) of the predetermined one ventilation adjusting means of the above embodiment is sequentially changed over several steps. At this time, the other damper (9) is in the fully closed state. Each air volume Qi1, Qi2, Qi at this time
By measuring 3 and the blowing pressure differences P1, P2, P3 corresponding to this air volume, the correlation between the blowing pressure difference P, the air volume Qi, and the opening Di of the damper (9) becomes clear.

Therefore, when the opening degree of one predetermined damper (9) is Di and the other damper (9) is fully closed, the air volume is
If the blowing pressure difference is P1 in Qi1, point 1 is the intersection of the blowing characteristic curve and the resistance curve of the blower (5) at that time. That is, P1 is the pressure difference between the outlet air pressure and the inlet air pressure of the indoor unit (2) by the blower (5), and this P1
Is equal to the airflow resistance of the duct conduit including the damper (9) when the airflow rate is Qi1.

According to this idea, the airflow resistance of the duct pipeline can be obtained more accurately than the idea of simply calculating the airflow resistance due to the pressure in the duct. This is due to the pressure in the duct,
This is because the pressure on the suction side is not evaluated, and the blowing resistance of the duct pipe is simply obtained from only the pressure on the blowing side.

By performing the same operation as above for the dampers (9) of the other blower adjusting means, the relationship between the blower pressure difference P, the air flow Qi, and the damper opening Di for each blower path can be tabulated or formulated. .

Then, the result of tabulation or formulation is stored in the initial setting information storage means (24).

If the accumulated information is used in the air blowing control in the actual operation, the air volume Q can be calculated with the air pressure difference P and the opening degree Di of the damper (9) of each air flow adjusting means being known. Alternatively, if the amount of air passing through each air flow adjusting means is set in advance, the opening Di of the damper (9) of each air flow adjusting means at the time of the air pressure difference P of the indoor unit (2) can be calculated. .

Therefore, if the air conditioner is configured by using the air volume calculation means (23) as described above, the accurate air blowing control for each room, which has been conventionally required, can be performed with the opening degree of each damper (9) and the opening degree of each damper (9). The blower capacity of the blower (5) can be controlled using the air flow as a control index. In addition, Japanese Patent Publication No. 60-47
There is no need to provide an air volume detection sensor function or the like for each air flow adjusting means as disclosed in Japanese Patent No. 497.

Next, the operation of the air conditioner of this embodiment will be described with reference to FIG. FIG. 3 is a flowchart showing an example of a control operation in a test operation mode of the air conditioner according to one embodiment of the present invention. Note that this control operation uses a microcomputer and selects the test run mode,
This routine is called, but the description of this control circuit is omitted here.

By setting the operation mode of the air conditioner to the test operation mode, operation control is performed according to the following routine.

First, in step S1, it is determined whether the operation mode is the test operation mode. When not in the test operation mode, a series of control operations described below are not performed. When in the test operation mode, the operation of the heat source unit (not shown in this embodiment) is stopped in step S2, and the operation of the blower (5) is started in step S3. Then, in step S4, the main duct (6)
N of the dampers (9) of the ventilation adjusting means connected to
Is set, and the first (I = 1) damper (9) is set in step S5.
Is set to the initial opening, and the remaining damper (9) is fully closed. The opening / closing control of the damper (9) is performed by damper control means (20). Then, in step S6, the actual air volume of the air blower (5) at this time is measured by the air volume detector (19) and the air volume measurement means (21). 2) is measured by the pressure difference detector (18) and the pressure difference measuring means (22). Subsequently, in step S8, it is determined whether or not the opening of the damper (9) (I = 1) should be the next set opening. If the next setting is required,
In step S9, the opening of the damper (9) (I = 1) is changed to the next set opening, and the process returns to step S6 to perform the operations in steps S6 and S7. This change in the opening degree differs depending on the type of the damper (9), but usually may be in two to three levels. In this case, also in this case, the other damper (9) remains in the fully closed state. The operations from step S6 to step S9 are repeated until the opening of the damper (9) reaches a predetermined set opening. On the other hand, if the opening of the damper (9) (I = 1) should not be set to the next set opening in step S8, that is, in this case, the opening of the damper (9) reaches the predetermined set opening. Is the case, but step S10
It is determined whether or not the damper (9) that has reached the set opening degree is the N-th damper (9). If it is not the Nth yet, I = I + 1 is set in step S11 and step S5 is performed again.
And the above operation is repeated. Therefore, the above operation is sequentially performed for all of the dampers (9) from I = 1 to I = N, and is repeated N times in total. If it is confirmed in step S10 that the I = N-th damper (9) has been reached, in step S12, the opening degree, air flow rate, and air pressure of each damper (9) obtained by the above series of operations. These relations are calculated from the data of the differences, and a table or a formula is formed for each of the blower adjusting means. This calculation operation is performed by the air volume calculation means (23), and the initial setting information is stored in the initial setting information storage means (24).

Subsequently, the actual control operation of the damper (9) and the blower (5) performed using the relationship between the opening degree of each damper (9), the amount of blown air, and the pressure difference of the blown air, which is tabulated or formulated, will be described. A brief description will be given along the flow of the flowchart in FIG. FIG. 4 is a flowchart showing an example of a control operation of the air conditioner of one embodiment of the present invention.

First, when this routine is called in step S12, in step S21, each airflow adjusting means is formulated or tabulated for each airflow adjusting means stored in the initial setting information storage means (24). Using the relationship between the air volume, the damper opening, and the air pressure difference of the indoor unit (2), for an arbitrary required air volume required for each air volume adjusting means,
The required air pressure difference Pi when the damper opening is fully opened is calculated. Next, in step S22, the maximum value Pimax of the required blowing pressure difference Pi of each blowing adjusting means is selected. Step S23
Then, the respective damper opening degrees that give each set air volume when the air pressure difference Pi is Pimax are obtained from the above relations for each air blowing adjustment means. At this time, the opening degree of the damper (9) of the ventilation adjusting means for which the required ventilation pressure difference Pi was Pimax in step S21 is naturally fully opened. Then, in step S24, the damper opening is obtained by instructing each of the ventilation adjusting means the opening degree of the damper obtained in step S23 to operate the damper (9). Thereafter, in step S25, the blower (5) is controlled such that the sum of the required air flow rates required for the respective air flow adjusting means and the air flow rate measured by the air flow rate measuring means become equal. Then, the sum of the required air blowing amounts is made equal to the actual total air blowing amount.

By performing such a control operation, it is possible to more easily realize, for example, a blowing control that minimizes the transfer power as disclosed in Japanese Patent Publication No. 60-47497 as a reference of the conventional example. .

As described above, in this embodiment, in the test operation mode, the damper control means (20) controls the opening and closing of the damper (9) of the air flow adjusting means so as to change the opening / closing degree for each unit and to completely close the other. Perform At this time, the amount of air blown by the blower (5) is determined by the air volume measuring means (21) via the air volume detector (19).
Is measured. At this time, the pressure difference between the blower of the indoor unit (2) and the blower from the blower (5) is detected by the pressure difference detector (1).
It is measured by the pressure difference measuring means (22) via 8). Then, based on the opening / closing information of the damper (9) by the damper control means (20), the air flow information by the air flow measuring means (21), and the information of the blowing pressure difference by the pressure difference measuring means (22), the air flow calculating means (23) These relationships are calculated and tabulated or formalized, and the initial setting information is stored in the initial setting information storage means (24). This series of operations is performed by the number of the ventilation adjusting means, and in order to blow a predetermined amount of air to each branch duct (7) or the like, how to control the air pressure difference and the opening / closing degree of the damper (9) of the ventilation adjusting means. Initial setting information on whether to perform the setting is stored in the initial setting information storage means (24) and is sequentially accumulated. In this way, the difference of the air path resistance of each duct is detected in advance, and the air volume of each terminal air volume control unit is indirectly estimated to obtain an appropriate opening / closing degree of the damper (9) with respect to the required air volume.

Then, in the actual operation mode, the degree of opening and closing of the blower (5) and the damper (9) of the blower adjusting means is appropriately controlled based on the initial setting information stored in the above-mentioned initial setting information storage means (24). Thus, an appropriate amount of cold air or hot air can be stably supplied to each of the air-conditioned rooms (1).

However, the test run operation described above (initial setting)
Is performed only at the time of the trial operation adjustment of the air conditioner (that is, at the time of the trial operation mode), and many of the above-described units required only for the trial operation are unnecessary during the normal operation. Especially,
The pressure difference detector (18) is generally expensive and may be an obstacle to reducing the cost of the system.

Therefore, in the air conditioner of this embodiment, the damper control means (20), the pressure difference detector (18), the pressure difference measurement means (22), and the air volume calculation means (2
3) is configured so as to be entirely removable as initial setting information acquisition means (25). Normally, the initial setting information acquisition means (25) is owned by the air conditioner equipment installation company, and is set and initialized only for the trial operation. The obtained initial setting information is stored in the initial setting information storage means (24).

With this configuration, not only can the cost of the entire system be reduced, but also an expensive and accurate pressure difference detector (18) can be used. It is also possible to improve the ventilation control accuracy.

Therefore, in this embodiment, it is possible to very easily distribute the appropriate air flow and reduce the transport power in accordance with the airflow resistance of each duct and the like, and to appropriately maintain the air flow supplied to each air-conditioned room (1). . Moreover, these controls can be performed with a simple configuration without using a special terminal air volume control unit having a wind speed sensor function. As a result, an efficient blowing operation can be realized with an inexpensive configuration.

Further, in this embodiment, various means used only for the trial operation are detachably configured as the initial setting information acquisition means (25) as a whole. As a result, an efficient and accurate air blowing operation can be realized with an inexpensive configuration.

[Effects of the Invention] As described above, in the air conditioner of the present invention, in the test operation mode, the damper control unit controls the opening / closing information of the damper, the air volume information by the air volume measurement unit, and the air pressure difference information by the pressure difference measurement unit. By calculating each of these relationships with the air volume calculation means and tabulating or formulating the differences, the difference in the air path resistance of each duct is detected in advance, and the air volume of each terminal air volume control unit is indirectly estimated, An appropriate degree of opening and closing of the damper with respect to the required air volume can be obtained.
Then, in the actual operation mode, by appropriately controlling the opening / closing degree of the blower and the damper based on the above information, distribution of the appropriate air volume and reduction of the transfer power can be performed according to the airflow resistance of each duct. The air flow to each room to be air-conditioned can be maintained properly, and these controls can be made simple without using a special terminal air flow control unit, etc. Operation can be realized. In addition, various units used only for the trial operation are configured inexpensively as the initial setting information acquiring unit as a whole, and an efficient and accurate blowing operation can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an entire system of an air conditioner according to one embodiment of the present invention, and FIG. 2 is a relationship between a flow rate of a blower used in the air conditioner according to one embodiment of the present invention and a blowing pressure difference. FIG. 3 is a flowchart showing an example of a control operation in a test operation mode of the air conditioner according to one embodiment of the present invention, and FIG. 4 is a control operation of the air conditioner according to one embodiment of the present invention. FIG. 5 is a block diagram showing a conventional air conditioner. In the figure, 1: Room to be conditioned, 4: Heat exchanger 5: Blower, 6: Main duct 7: Branch duct, 9: Damper 16: Pressure detector, 18: Pressure difference detector 19: Air flow detector, 20: Damper control means 21: air flow measurement means, 22: pressure difference measurement means 23: air flow calculation means 24: initial setting information storage means 25: initial setting information acquisition means. In the drawings, the same reference numerals and symbols indicate the same or corresponding parts.

 ────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-102133 (JP, A) JP-A-3-51658 (JP, A) JP-A-57-184848 (JP, A)

Claims (1)

(57) [Claims] 1. A centralized air blowing means for distributing and blowing air exchanged by a heat exchanger to each of a plurality of air-conditioned rooms through a main duct and a branch duct by a blower, and attached to each of said branch duct portions. A blower adjusting unit that adjusts a blown amount of the cool air or the warm air to each air-conditioned room by opening and closing a damper; and an air flow measuring unit that detects an air flow from the blower with an air flow detector and measures an actual air flow. When the opening and closing of the damper of the blower adjusting means is in the test operation mode, the damper control means for changing the degree of opening and closing for each unit and fully closing the other, and the pressure of the outlet air pressure and the inlet air pressure of the centralized blower means The pressure difference is detected by a pressure difference detector, and the pressure difference measuring means for measuring the air pressure difference with respect to the actual duct system, and the respective air blowing adjustments are performed by the respective outputs of the pressure difference measuring means, the air volume measuring means, and the damper control means. Wind passing through means And calculates the correlation between the opening and closing degree of the damper and the blowing pressure difference,
Air flow calculating means for calculating the initial setting information of the air flow control for obtaining the air flow resistance in each duct, and detecting in advance the difference in the air flow resistance of each duct, and indirectly controlling the air volume of each terminal air flow control unit. Initial setting information obtaining means for obtaining the initial setting information for obtaining an appropriate degree of opening and closing of the damper with respect to the required air flow, and initial setting information storing means for storing the initial setting information. An air conditioner characterized by: