JPH0765792B2 - Air conditioner - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an air conditioner having a plurality of refrigerant circuits in which a plurality of outdoor units and a plurality of indoor units are correspondingly connected, and more particularly to an indoor unit. Regarding measures to check for incorrect wiring of electrical wiring that connects the outdoor unit with the outdoor unit.

(Prior Art) Conventionally, as a method for checking the mismatch between the refrigerant pipe and the electric wiring during the installation work of the multi-type air conditioner,
As disclosed in Japanese Patent Laid-Open No. 63-113843, in an air conditioner having a plurality of refrigerant circuits in which an indoor unit is connected to each of a plurality of outdoor units, a low pressure is detected by the outdoor unit, When the air conditioner unit is operated according to the operation command from the indoor unit and the low pressure is lowered due to a pump down operation state in the refrigerant circuit to which the indoor unit is connected by mistake, by sending a miswiring signal to the indoor unit, It is a known technique to detect an erroneous connection of air wiring between each air conditioning unit.

(Problems to be Solved by the Invention) With the above-mentioned conventional one, it is possible to effectively detect an erroneous connection of electric wiring of a multi-type air conditioner used in a building having many air-conditioned spaces such as a building.

By the way, at the time of assembling the refrigerant pipes to the multi-type air conditioner as described above, since the communication pipes are complicatedly laid, correspondence between the electric wiring and the refrigerant pipes does not match, and each indoor unit is originally There is a case that the outdoor unit to be connected is not connected but is erroneously connected. In that case, if the correspondence between the electric wiring and the refrigerant pipes does not match, during cooling operation, the indoor unit that is electrically connected to the compressor that is in operation but the refrigerant pipes are not connected will not have sufficient capacity. On the other hand, in the indoor unit in which the refrigerant pipe is erroneously connected even though it is not electrically connected to the operating compressor, there is a problem that the refrigerant circulates with the expansion valve closed and the pump goes into a down state.

In that case, even if an attempt is made to use the above-mentioned conventional one, the indoor unit that outputs the operation command does not go into the pump-down state, so it is not possible to detect an incorrect connection of the refrigerant pipes. That is, the above-mentioned conventional one can be applied only to the one in which the refrigerant pipe is normally connected.

The present invention has been made in view of such a point, and an object thereof is to reliably prevent erroneous connection of refrigerant pipes during a test operation after installation of the device, from changes in the physical state of the refrigerant in each indoor heat exchanger. To detect.

(Means for Solving the Problem) In order to achieve the above object, the solution means of the present invention is to check the correctness of the correspondence between the electric wiring and the refrigerant pipe by the change in the gas-liquid differential temperature in the indoor heat exchanger. is there.

Specifically, the first solving means is as shown in FIG.
A fan (12) is provided for the plurality of outdoor units (X), (Y) containing the compressor (1) and the outdoor heat exchanger (6).
a) A plurality of indoor units (A) to (E), (F) to (J) having a built-in indoor heat exchanger (12) are arranged, and a plurality of refrigerant circuits (M) and (N). The target is an air conditioner equipped with.

Then, as an operation control device of the air conditioner, a command signal output means (RCS) for outputting a test operation command signal and an output of the command signal output means (RCS) are received, and each fan (12
A), ... Is set to a strong air volume, and a trial run control means (53) for operating each compressor (1), (1) is provided.

Furthermore, the indoor units (A) to (E), (F) to
For each (J), a liquid pipe temperature detecting means (TH2) for detecting the liquid pipe temperature of each indoor heat exchanger (12), and each indoor heat exchanger (1
2) Gas pipe temperature detection means (TH3) for detecting the gas pipe temperature
And a temperature difference calculating means (5) for calculating the temperature difference between the gas pipe temperature and the liquid pipe temperature by receiving the outputs of the both detecting means (TH2) and (TH3).
1) and the trial operation control means (53) at the time of trial operation on one refrigerant circuit (M or N) side, the differential temperature calculating means (51)
The storage means (52) for storing the initial temperature difference value at the start of the trial operation and the output of the temperature difference calculation means (51) for receiving the output of Comparing means (54) for comparing the deviation from the initial temperature difference value stored in the means (52) with a predetermined value, and the comparing means (54)
The normal signal output means (55) which outputs a normal connection signal when the deviation is larger than a predetermined value and the incorrect connection signal output means (56) which outputs an incorrect connection signal when the deviation is less than the predetermined value. And is provided.
Japanese device.

A second solution means is to use the normal signal output means (55) in the first solution means to send a normal connection signal to the outdoor unit (X
Alternatively, the output is made to the Y) side.

A third solution means is to change the test operation command signal output signal (RCS) in the first solution means to each indoor unit (A) to
It is provided in (E), (F) to (J).

(Operation) With the above configuration, in the invention of claim (1), when the apparatus is installed, in one refrigerant circuit (M), from the indoor units (A) to (E) by the command signal output means (RCS) In response to the test operation command signal of the above, the test operation control means (53) sets the air volume of each indoor fan (12a), ... to a strong air volume to operate the compressor (1), and each indoor unit (A).
Then, the temperature difference calculating means (51) detects the gas pipe temperature and the liquid pipe temperature detecting means (T3) detected by the gas pipe temperature detecting means (TH3).
The temperature difference with the liquid pipe temperature detected in H2) is calculated, and the temperature difference value at the start of the test operation is stored as the initial temperature difference value in the storage means (52). Then, when a predetermined time has elapsed after the start of the test operation, the comparison means (54) determines whether the difference between the temperature difference value at that time and the initial temperature difference value stored in the storage means (52) and the predetermined value are large or small. Be compared.

In that case, the liquid pipe temperature in the indoor heat exchanger (12) of the indoor unit that is electrically connected to the compressor (1) in operation but is not connected to the refrigerant pipe does not decrease, and the differential temperature value Therefore, the difference between the temperature difference value and the initial temperature difference value does not become larger than the predetermined value, and the wrong connection signal output means (56) outputs the wrong connection signal.

On the other hand, if the refrigerant pipe is connected in correspondence with the electric wiring, the liquid pipe temperature decreases and a temperature difference value is attached after a predetermined time has elapsed after the start of the trial operation, and the difference between the temperature difference value and the initial temperature difference value is detected. Becomes larger than a predetermined value, the normal signal output means (55) outputs a normal connection signal.

Therefore, the correctness of the correspondence between the electric wiring and the refrigerant pipe can be surely checked, and the pump down operation can be prevented.

In the invention of claim (2), in the same operation as the invention of claim (1), the normal signal is output to the outdoor unit (X) side by the normal signal output signal (55), and the outdoor unit (X) is output. By displaying the signal according to the signal on the () side, the connection check for each of the indoor units (A) to (E) is performed at one time.

According to the invention of claim (3), in the same operation as the invention of claim (1), the indoor units (A) to (E),
Command signal output means (RC) provided in (F) to (J)
The connection check of the invention of claim (1) is performed by S), ..., From the side of each indoor unit (A) to (E), (F) to (J) while using the existing sensor or the like. The incorrect connection will be visually checked.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings starting from FIG.

FIG. 2 shows the overall connection of a multi-type air conditioner to which the present invention is applied, showing two outdoor units (X) and (Y).
In contrast, five indoor units (A) to (E) and (F) to (J) are connected in parallel via the refrigerant circuits (M) and (N), respectively. The two refrigerant circuits (M),
(N) has the same configuration, and hereinafter, one refrigerant circuit (M)
Will be described only.

FIG. 3 shows the refrigerant piping system of the refrigerant circuit (M). Inside the outdoor unit (X), the capacity is changed by an inverter (2a) that can variably switch the output frequency in the range of 30 to 70 Hz every 10 Hz. The first compressor (1a) to be adjusted and the unloader (2b), which differentially operates depending on the pilot pressure, adjusts the capacity in two stages: full load (100%) and unload (50%). Compressor (1) with variable capacity configured by connecting the compressor (1b) in parallel via a check valve (1e)
And an oil separator (4) for separating the oil in the gas discharged from the compressor (1), and the four-way switching as shown by the broken line in the figure during the heating operation and the preferable switching by the solid line in the figure during the cooling operation. A switching valve (5), an outdoor heat exchanger (6) serving as a condenser during cooling operation, and an evaporator during heating operation, and the outdoor heat exchanger (6)
Outdoor fan (6a) attached to the supercooling coil (7)
The outdoor electric expansion valve (8) that regulates the refrigerant flow rate during cooling operation and throttles the refrigerant during heating operation, the receiver (9) that stores the liquefied refrigerant, and the accumulator (10) are the main devices. Each of the devices (1) to (10) is built in and is connected to a refrigerant communication pipe (11) so that the refrigerant can flow. Also, the indoor unit (A)
(E) have the same configuration, and each is an indoor heat exchanger (12) that serves as an evaporator during cooling operation and as a condenser during heating operation.
And its fan (12a), and the liquid refrigerant branch pipes (11a) of the indoor heat exchanger (12) ... adjust the refrigerant flow rate during the heating operation and perform the throttle action of the refrigerant during the cooling operation. The indoor electric expansion valves (13) ... Are respectively interposed and connected to the outdoor unit (A) by a connecting pipe (11b) via a manual closing valve (17) after joining. That is, each of the above devices is connected by a refrigerant pipe (11) so that the refrigerant can flow, and a refrigerant circuit (M) configured to release the heat obtained by heat exchange with the outdoor air to the indoor air is configured. Has been done.

In addition, the device is equipped with many sensors,
1) ... is a room temperature thermostat that detects the temperature of each room, (T
H2) ... and (TH3) ... are an indoor liquid temperature sensor and an indoor gas temperature sensor for detecting the temperature of the refrigerant in the liquid side and gas side piping of the indoor heat exchanger (12), respectively, and (TH4) is the compressor (1 ) Discharge pipe sensor to detect the discharge pipe temperature, (TH5)
Is a defrost sensor that detects the frosted state from the outlet temperature of the outdoor heat exchanger (6) during heating operation, and (TH6) is the liquid pipe (1
Placed in the suction pipe (11) after heat exchange with 1),
The intake pipe sensor that detects the intake pipe temperature, (TH7) is located at the air intake port of the outdoor heat exchanger (6), and the outside air temperature sensor that detects the intake air temperature, (P1) is the low pressure, that is, the evaporation pressure during cooling operation. It is a pressure sensor that detects the equivalent saturation temperature Te and the high pressure, that is, the condensation pressure equivalent saturation temperature Tc during heating operation.

In addition to the above-mentioned main devices, various auxiliary devices are provided. (1f) is the bypass (11) of the second compressor (1b)
The solenoid valve for the unloader, which is installed in c), opens when the second compressor (1b) is stopped and is in the unload state, and is closed when it is in the full load state. (21) is the discharge pipe and the suction pipe. This is a solenoid valve for pressure equalization that is provided in a pressure equalizing hot gas bypass passage (11d) connecting to a pipe and is opened for a fixed time before restarting when the compressor (1) is stopped due to a thermo-off state or the like. Further, (11e) is a heating overload control bypass passage, and the outdoor heat exchanger (6a) is provided in the bypass passage (11e).
Auxiliary heat exchanger (22), check valve (23) installed in the same air passage as the solenoid valve (2)
4) and the capillaries (28) are sequentially connected in series so that the discharge gas flows by bypassing the outdoor heat exchanger (6) at the time of heating overload. In addition, (11
g) is a liquid injection bypass passage for connecting the liquid refrigerant side pipe of the heating overload bypass passage (11e) and the suction line of the refrigerant circuit (M) to adjust the superheat degree of the suction gas during the cooling and heating operation. And the bypass path (11
In g), an injection solenoid valve (29) that opens and closes in conjunction with turning on and off the compressor (1), and the opening is adjusted according to the degree of superheat of the intake gas detected by the temperature sensing tube (TP1). The automatic expansion valve (30) is installed.

Further, in the figure, (HPS) is a high pressure switch for protecting the compressor, and (SP) is a service port.

The solenoid valves and sensors are connected to the outdoor control unit (15), which will be described later, together with the main equipment by signal lines,
The outdoor control unit (15) is an indoor control unit (16)
It is connected to ... by a communication wire so that signals can be exchanged.

FIG. 4 is an electric circuit diagram showing a wiring relationship between the inside of the outdoor control unit (15) arranged on the side of each outdoor unit (X) and each connected device. In the figure, (MC1) is the motor of the first compressor (1a) connected to the frequency conversion circuit (INV) of the inverter (2a), and (MC2) is the second compressor (1b).
Motors, (52C ₁ ) and (52C ₂ ) are electromagnetic contactors that operate the frequency conversion circuit (INV) and the motor (MC ₂ ), respectively. The above devices include a fuse box (FS) and an earth leakage breaker (BR1). The external control unit (15) is connected to the outdoor control unit (15) by a single-phase AC power supply. Further, (MF) is a fan motor for the outdoor fan (6a), and (52F _H ) and (52F _L ) are electromagnetic contactors for operating the fan motors (MF). Outdoor fan (6a) when connected in parallel to the phase components and when the electromagnetic contactor (52F _H ) is connected
Is a strong wind (standard air volume), and when the electromagnetic contactor (52F _L ) is in a connected state, the outdoor fan (6a) can be selectively switched so that it becomes a weak wind.

Next, inside the outdoor control unit (15), the normally open contacts (RY ₁ ) to (RY ₈ ) of the electromagnetic relay are connected in parallel to the single-phase AC current, and these are connected in order to the four-way connection. Switching valve (5)
Electromagnetic relay (20S), an electromagnetic contactor of the frequency converting circuit (INV) (52C _1), an electromagnetic contactor of the second compressor (1b) (52
C ₂ ), outdoor fan electromagnetic contactor (52F _H ), (52F _L ), hot gas solenoid valve (21) solenoid relay (SV _P ), injection solenoid valve (29) solenoid relay (SV _T ). And each sensor (TH1) that is connected in series to the coil of the electromagnetic relay (SV _L ) of the unloader solenoid valve (1f) and is input to the outdoor control unit (15) directly or via the indoor control unit (16). )-(TH7) signals are opened and closed to open and close the contacts of each electromagnetic contactor or electromagnetic relay. A coil of a pulse motor (EV) that adjusts the opening of the outdoor electric expansion valve (8) is connected to the terminal CN. In the circuit on the right side of the figure, (CH ₁ ), (C
H ₂ ) are oil forming prevention heaters of the first compressor (1a) and the second compressor (1c), respectively, which are connected in series with the electromagnetic contactors (52C ₁ ) and (52C ₂ ), respectively. Current flows through (1a) and (1b) when stopped. Furthermore, (51C ₁ ) is the overcurrent relay of the motor (MC ₁ ), (49C ₁ ) and (49C ₂ ) are the first compressor (1a),
Switch for temperature rise protection of the second compressor (1b), (63
H _1), (63H ₂₎ the first compressor, respectively (1a), the pressure increase protection switch of the second compressor (1b), a overcurrent relay (51F) is a fan motor (MF), these Are connected in series to form a protection circuit that turns on the electromagnetic relay (30F _X ) at startup and turns it off in case of failure. The outdoor control unit (15) includes an outdoor control device (15a) indicated by a broken line, and the outdoor control device (1
The operation of each device is controlled by 5a) in accordance with a signal input from each indoor control unit (16) ... Or each sensor.

Next, FIG. 5 is an electric circuit diagram showing the main wiring of the inside of the indoor control unit (16) and each connected device. In the figure, (MF) is an indoor fan (12a) motor, which receives a single-phase AC power source and switches between strong wind and weak wind in order of increasing air volume by each relay terminal (RY ₁ ) to (RY ₃ ) to perform heating operation. When the room temperature thermostat (TH1) signal is generated, a slight breeze is provided. And the indoor control unit (1
Indoor electric expansion valve (13) for the terminal CN of the printed circuit board of 6)
While a pulse motor (EV) that adjusts the opening of is connected, a room temperature thermostat (TH1) and temperature sensor (TH
2), (TH3) signal is input. Further, each indoor control unit (16) is connected to the outdoor control unit (15) via a signal line so that signals can be transmitted and received, and is also connected to a remote control switch (RCS) by a signal line. The indoor control unit (16) has a built-in indoor control device (16a) indicated by a broken line, and the indoor control device (16a) operates in response to a signal from each sensor or the outdoor control unit (15). The operation of the electric expansion valve (13) or the indoor fan (12a) is controlled.

Then, by the connection configuration of the indoor control unit (16), the outdoor control unit (15), and each device, the remote control device (RCS) of each indoor unit (A) to (E) operates according to the operation. The compressor (1) and other devices are operated on the outdoor unit (X) side, and the remote control device (RCS) functions as command signal output means for outputting a test operation command signal. I have.

In FIG. 3, during cooling operation of the air conditioner, the four-way switching valve (2) is switched to the solid line side in the figure, and the refrigerant compressed by the compressor (1) is condensed by the outdoor heat exchanger (6). , Is branched and sent to each indoor unit (B) to (F) via the connection pipe (11b). In each indoor unit (B) to (F), the pressure is reduced by each indoor electric expansion valve (13) ...
After evaporating in 2), they merge, return to the outdoor unit (A) in a gas state, and circulate so as to be sucked into the compressor (1) (see solid arrow in the figure).

Further, during the heating operation, the four-way switching valve (5) is switched to the broken line side in the figure, the flow of the refrigerant is opposite to that during the cooling operation, and the refrigerant compressed by the compressor (1) is exchanged in each room. Bowl (1
It is condensed in 2), merges and flows into the liquid-to-outdoor unit (A), is decompressed by the outdoor electric expansion valve (8), and circulates so as to return to the compressor (1) evaporated in the outdoor heat exchanger (6). (Refer to the dashed arrow in the figure).

Here, as a feature of the present invention, at the time of assembling the device, the electrical connection is checked by a transmission line and whether the refrigerant piping system in each refrigerant circuit (M) or (N) is normally connected is checked. A test run is performed to check. Below, each indoor control control device (16a) at that time
The contents of control performed by will be described with reference to FIG. 5 by taking a cooling operation as an example. When a test operation command signal is output from the remote control device (RCS),
In step S ₁ , the detection values T ₂ and T ₃ of the indoor liquid temperature sensor (TH2) and the indoor gas temperature sensor (TH3) are input, and the differential temperature (superheat degree) Sh thereof is calculated in step S ₂ . Next, in step S _3, to determine whether or not the connection checking operation, if the connection check operation, while performing a normal operation in step S _4, if the connection check operation, further connection check in step S ₅ determine the start or not the operation, if at the start of the connection check operation, in step S _6, the timer (not shown) sets, then the initial differential temperature value Sh a differential temperature value Sh of '
And the indoor fan (12a) is set to a high air volume "H".

Thereafter, by performing the connection check operation until the set time of the timer expires at the determination of step S _7, becomes a time-up, the process proceeds to step S _8, the indoor fan (12a)
Is a strong air volume H, and the current temperature difference value Sh and the above initial temperature difference value S
It is determined whether or not the deviation (Sh-Sh ') from h'is larger than a predetermined value A (for example, a value of about 10 deg), and if the condition is not satisfied, it is determined that the connection is incorrect, and step S While outputting an erroneous connection signal notifying that there is a connection error at ₉ ,
If the above two conditions are satisfied, it is determined that the connection of the electric wiring and the connection of the refrigerant piping system have been taken,
Outputs a normal connection signal in step S _10.

In the above flow, the step S _2, the indoor liquid temperature and the gas temperature sensor (TH2), receives the output of the (TH3), differential temperature calculating means for calculating a temperature difference between the gas pipe temperature and the liquid pipe temperature (51) is constituted by the step S _6, the difference rise arithmetic means (51)
And a storage unit (52) configured to store the initial temperature difference value at the start of the test operation. Also step
The S _6, receiving the output of the remote control device (instruction signal output means) (RCS), the indoor fan (12a), ... a strong wind amount to the compressors (1), commissioning control means for driving the (1) (53) is constituted by step S _8, it receives the output of the differential temperature calculating means (51), storage means (52) of the initial differential temperature value Sh stored 'as when passed commissioning after a predetermined time Comparing means (54) for comparing the deviation (Sh-Sh ') from the temperature difference value Sh with the predetermined value A is configured. Further, in step S _10, receiving the output of said comparator means (54), the deviation normal signal output means (Sh-Sh ') is to output a normal connection signal when greater than the predetermined value A (55) is formed, in step S _9, the deviation misconnection signal output means (Sh-Sh ') outputs a connection signal false when more than the predetermined value a (56)
Is configured.

Therefore, in the above embodiment, when the apparatus is installed, the trial run control means (53) is responsive to the trial run command signals from the indoor units (A) to (E) by the remote control device (command signal output means) (RCS). By setting the air volume of each indoor fan (12a), ... to a high air volume, the compressor (1) in one refrigerant circuit (M) is operated, and in each indoor unit (A), the temperature difference calculating means is set. (51) calculates the temperature difference Sh between the gas pipe temperature T ₃ detected by the indoor gas temperature sensor (TH3) and the liquid pipe temperature T ₂ detected by the indoor liquid temperature sensor (TH2), and the storage means ( By 52), the temperature difference value at the start of the test operation is stored as the initial difference deviation Sh '. Then, when a predetermined time t ₀ has elapsed after the start of the trial operation, the comparison means (5
According to 4), the difference (Sh-Sh ') between the temperature difference value Sh at that time and the initial temperature difference value Sh' stored in the storage means (52) and the predetermined value A are compared.

In that case, for example, as shown in FIG. 7, the indoor unit (E)
Is erroneously connected to the outdoor unit (Y) side, that is, the refrigerant circuit (N) side, and the indoor unit (F) is erroneously connected to the outdoor unit (X) side, that is, the refrigerant circuit (M) side. Then, when the test operation command signal is output from the remote control device (RCS) of the indoor unit (E), the compressor (1) of the refrigerant circuit (M) is operated and the indoor electric expansion valve (of the indoor unit (E) ( Even if 13) is opened, the refrigerant does not circulate in the indoor heat exchanger (12) of the indoor unit (E). Therefore, as shown in FIG. 8, the liquid pipe temperature T ₂ in the indoor heat exchanger (12) of the indoor unit (E) is not adjusted (see the straight line 1 in the figure), and the differential temperature value Sh is not applied. The deviation (Sh-Sh ') from the temperature difference value Sh' does not become larger than the predetermined value A. On the other hand, if the indoor unit (E) is connected to the outdoor unit (X) side, a predetermined time t ₀ after the start of trial operation
When elapses, the liquid pipe temperature T ₂ decreases and the differential temperature value Sh follows, so the deviation (Sh-Sh ') from the initial differential temperature value Sh' becomes larger than the predetermined value A (curve in the figure. m)).

That is, when the refrigerant pipes are normally connected, the deviation (Sh−Sh ′) after the elapse of the predetermined time t ₀ is the predetermined value A.
The normal signal output means (55) outputs a normal connection signal, and when the refrigerant pipes are incorrectly connected, the deviation (Sh-Sh ') becomes a predetermined value A or less, The incorrect connection signal output means (56) outputs an incorrect connection signal.

The above operation is performed for each indoor unit (A)-(E), (F)-
By sequentially performing (J), it is possible to confirm the correspondence relationship between the outdoor units (X) and (Y) and the indoor units (A) to (E) and (F) to (J), and the refrigerant piping may be erroneous. You can check the connection reliably. Further, as a result, the indoor unit (F) in which the refrigerant pipe is erroneously connected to the refrigerant circuit (M) side as shown in FIG. 7, for example.
It is possible to effectively prevent the pump down operation in the above.

However, in the invention of claim (1), the command signal output means for outputting the test operation command signal is an indoor unit (A).
It is not limited to the remote control devices (RCS) of (E), (F), (J), and may be output from the outdoor units (X), (Y).

In that case, since the invention of claim (2) outputs the normal connection signal to the outdoor unit (X), (Y) side, the abnormal lamp is displayed by the display lamp or the like using the signal. Thus, there is an advantage that the incorrectly connected indoor unit can be detected on the outdoor unit (X), (Y) side.

In the invention of claim (3), each indoor unit (A)-
The connection check according to the invention of the above-mentioned claim (1) is performed by the command signal output means (RCS) provided in (E), (F) to (J), and each indoor unit (A) to (E). ),
(F) to (J) can visually check erroneous connections, and there is an advantage that only an existing sensor or the like is required.

In the above embodiment, when both the electric wiring and the refrigerant pipe of the indoor unit (E), which was originally intended to be connected to the outdoor unit (X), are connected to the outdoor unit (Y), leave them as they are. Even if it is set aside, normal air conditioning can be performed and there is no problem.

Further, the number of outdoor units arranged in the air conditioner of the present invention is not limited to the above-mentioned embodiment, and the same as in the above-mentioned embodiment even when a large number of three or more outdoor units are arranged. It can be effective. Further, as an application of the present invention, a plurality of compressors (1) ... Are built in one outdoor unit (X), and an indoor unit (A) ... Is connected to each of the compressors (1). It goes without saying that the same can be applied to an air conditioner including a plurality of refrigerant circuits.

(Effect of the invention) As described above, according to the invention of claim (1), in an air conditioner including a plurality of refrigerant circuits in which an indoor unit is connected to each of a plurality of outdoor units by a refrigerant pipe,
While performing the trial operation with the indoor fan at a high air volume, the temperature difference between the gas pipe temperature and the liquid pipe temperature is detected by the indoor heat exchanger of each indoor unit, and the temperature difference value and the trial operation after a lapse of a predetermined time after starting the trial operation It is determined that the connection is normal when the deviation from the temperature difference immediately after the start is larger than the predetermined value and that the connection is when the deviation is less than the predetermined value. Can be checked. Further, by doing so, the pump down operation can be effectively prevented, and the reliability of the device can be improved.

According to the invention of claim (2), in the invention of claim (1), the normal connection signal is output to the outdoor unit side. Therefore, by the combined use of the display means, the trial operation by the trial operation command from the outdoor unit side. It is possible to check the indoor unit incorrectly connected to the outdoor unit more quickly while performing the above.

According to the invention of claim (3), in the invention of claim (1), since the test operation command signal is output from each indoor unit side, the misconnection of the refrigerant pipe is visually observed on each new inner unit side. Can be checked.

[Brief description of drawings]

FIG. 1 is a diagram showing the configuration of the present invention. 2 and the following drawings show an embodiment of the present invention, FIG. 2 is a block diagram schematically showing the connection of the entire apparatus, FIG. 3 is a refrigerant piping system diagram of a refrigerant circuit, and FIG. 4 is an outdoor control unit. Electrical circuit diagram of the fifth
FIG. 7 is an electric circuit diagram of the indoor control unit, FIG. 6 is a flow chart showing the control contents at the time of test operation, FIG. 7 is an explanatory view showing an example of an erroneous connection state of the refrigerant pipes in the outdoor unit and the indoor unit, and FIG. The figure is a characteristic diagram showing a change in the temperature of the indoor liquid pipe after the start of the trial operation. 1 …… Compressor 6 …… Outdoor heat exchanger 12 …… Indoor heat exchanger 12a …… Indoor fan RCS …… Remote control device (command signal output means) 51 …… Differential temperature calculation means 52 …… Storage means 53… … Test operation control means 54 …… Comparison means 55 …… Normal signal output means 56 …… Incorrect connection signal output means A to J …… Indoor unit X, Y …… Outdoor unit M, N …… Refrigerant circuit

Claims (3)

[Claims] 1. A plurality of outdoor units (X), (Y) containing a compressor (1) and an outdoor heat exchanger (6),
A plurality of indoor units (A) to (E), (F) to (J) containing an indoor heat exchanger (12) with a fan (12a) attached
An air conditioner comprising a plurality of refrigerant circuits (M), (N) in which are arranged, command signal output means (RCS) for outputting a test operation command signal.
And receiving the output of the command signal output means (RCS), making the fans (12a) ,.
The test operation control means (53) for operating (1) is provided, while the liquid in each indoor heat exchanger (12) is provided for each indoor unit (A) to (E), (F) to (J). Liquid pipe temperature detecting means (TH2) for detecting the pipe temperature, gas pipe temperature detecting means (TH3) for detecting the gas pipe temperature of each indoor heat exchanger (12), and both detecting means (TH2), (TH3) ), The temperature difference calculating means (51) for calculating the temperature difference between the gas pipe temperature and the liquid pipe temperature,
A storage means (52) for receiving the output of the temperature difference calculation means (51) during the test operation of one refrigerant circuit (M or N) side by the test operation control means (53) and storing the initial temperature difference value at the start of the test operation. ) And the output of the temperature difference calculation means (51), and the difference between the temperature difference value when a predetermined time has elapsed after the start of the trial operation and the initial temperature difference value stored in the storage means (52) is a predetermined value. A comparing means (54) for comparing, a normal signal output means (55) for receiving an output of the comparing means (54) and outputting a normal connection signal when the deviation is larger than a predetermined value, and a deviation of a predetermined value or less. An air conditioner characterized by comprising an erroneous connection signal output means (56) which sometimes outputs an erroneous connection signal. 2. The air conditioner according to claim 1, wherein the normal signal output means (55) outputs a normal connection signal to the outdoor unit (X or Y) side. 3. The air conditioner according to claim 1, wherein the test operation command signal output means is arranged in each of the indoor units (A) to (E) and (F) to (J).