JPH09112998A - Trially operating method for multizone air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To easily and rapidly detect the connecting mistake of a refrigerant tube 11 and a signal wiring at the time of installing in a multizone air conditioner that a plurality of indoor units are connected to one outdoor unit. SOLUTION: The method for trially operating a multizone air conditioner comprises the steps of operating the conditioner according to the signal from the controller 4 of an outdoor unit O after the installation construction is completed, temporarily stopping the operation after a predetermined time is elapsed, detecting the refrigerant temperature of the inlets of heat exchangers 5 of indoor units A, B, C after a predetermined time is elapsed after stopping, storing it, then, restarting the compressor 1 and an outdoor blower 3 of the unit O, stopping the indoor blowers 3 of the units A, B, C, detecting the refrigerant temperatures of the inlets of the exchangers 5 of the units A, B, C after the set time is elapsed in the state that a motor driven expansion valve 7 is fully opened, comparing it with the stored value, displaying the effect that the refrigerant tube 11 and the wiring 12 are normally connected if the temperature difference therebetween is the predetermined difference or more on the display unit of the controller of the outdoor unit, or displaying the malfunction on the display unit if it is the predetermined difference or less.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test operation method for a multi-type air conditioner in which a plurality of indoor units are connected to one outdoor unit.

[0002]

2. Description of the Related Art A system diagram of a conventional multi-type air conditioner of this type is shown in FIG. The multi-type air conditioner includes one outdoor unit O and a plurality of (three in the figure) indoor units A, B, and C.

The outdoor unit O is provided with a compressor 1, an outdoor heat exchanger 2, an outdoor blower 3, an outdoor controller 4 and the like. Each indoor unit A, B, C has an indoor heat exchanger 5, an indoor blower 6, an electric expansion valve 7, a capillary tube 8, a heat exchange temperature sensor 9 for detecting the refrigerant temperature at the inlet of the indoor heat exchanger 5, an indoor controller. 10 etc. are provided.

When installing this multi-type air conditioner, after the outdoor unit O is installed outdoors and each indoor unit A, B, C is installed indoors, the indoor units A, B, C are attached to the outdoor unit O. Connected in parallel by the refrigerant pipe 11, and the outdoor controller 4 and the indoor controller
10 are connected to each other by signal wiring 12.

[0005]

There is a case where the refrigerant pipe 11 and the signal wiring 12 are not normally connected due to a mistake in the installation work of the conventional air conditioner. Then, during the trial run after the completion of the installation work, the high pressure refrigerant pressure in the refrigerant circuit may abnormally rise, or the indoor heat exchanger 5 may freeze, but it may be determined which indoor unit is erroneously connected. It was difficult to do.

[0006]

SUMMARY OF THE INVENTION The present invention has been invented to solve the above problems, and its gist is to provide a plurality of indoor units with a refrigerant pipe for one outdoor unit. Also, in a multi-type air conditioner that is connected via signal wiring, the air conditioner is operated by a signal from the controller of the outdoor unit after the installation work is completed, and after the specified time has passed, the operation is temporarily stopped and then stopped. After the set time has elapsed, the refrigerant temperature at the heat exchanger inlet of each indoor unit is detected and stored, and then the compressor and the outdoor blower of the outdoor unit are restarted and the indoor blower of each indoor unit is stopped, and , The electric expansion valve is fully opened, the refrigerant temperature at the indoor heat exchanger inlet of each indoor unit is detected after the set time elapses in this state, and the temperature between this and the stored value is detected. If the temperature difference is equal to or more than a predetermined temperature difference, the fact that the refrigerant pipe and the signal wiring are normally connected is displayed on the display unit of the controller of the outdoor unit, and if the temperature difference is less than the predetermined temperature difference, the above display unit is abnormally displayed. And the test operation method of the multi-type air conditioner.

Another feature is that the display section is composed of four sets of 7-segment LEDs provided on the substrate of the controller of the outdoor unit, and blinks normal and abnormal on the display.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to the control flowchart shown in FIG. After the installation work of the outdoor unit O and the indoor units A, B, and C is completed, the outdoor controller 4 outputs an operation command to each indoor controller 10 via the signal wiring 12 to start the operation of the air conditioner.

Then, the gas refrigerant discharged from the compressor 1 enters the outdoor heat exchanger 2, where it radiates heat to the outside air blown by the outdoor blower 3 to be condensed and liquefied. This liquid refrigerant is passed through the refrigerant pipe 11 to each indoor unit A, B, C.
To the indoor heat exchanger 5 after being adiabatically expanded by being throttled in the process of flowing through the electric expansion valve 7 and the capillary tube 8 into the indoor heat exchanger 5, where the indoor air blown by the indoor blower 6 is cooled. By doing so, it is vaporized.

Thereafter, the gas refrigerants merge in the refrigerant pipe 11 to return to the outdoor unit O and are sucked into the compressor 1. After this operation continues for a predetermined time (for example, 25 minutes),
Stop the operation of the air conditioner. When the set time (for example, 3 minutes) has passed since the stop, the heat exchange temperature sensor 9
The refrigerant temperatures T ₁ , T ₂ , and T ₃ at the inlets of the indoor heat exchangers 5 are detected by the and stored respectively.

Next, by restarting only the outdoor unit O, the compressor 1 and the outdoor blower 3 thereof are operated, and at the same time, the indoor blower 6 of each indoor unit A, B, C is stopped and electrically driven. The expansion valve 7 is fully opened.
As a result, each indoor heat exchanger 5 does not absorb heat from the indoor air, and the temperature of each indoor heat exchanger 5 gradually decreases.

This operating state is set for a set time (for example, 20 seconds)
When the time has passed, the heat exchanger temperature sensor 9 detects the refrigerant temperatures t ₁ , t ₂ , and t ₃ at the inlets of the indoor heat exchangers 5 again.

These detected temperatures t ₁ , t ₂ , t ₃ are compared with the temperatures T ₁ , T ₂ , T ₃ previously detected and stored, and the temperature differences ΔT ₁ , ΔT ₂ , ΔT between them are compared. _{If 3} is a predetermined temperature difference (for example, 7 deg ° C.) or more, it is determined that the connection of the refrigerant pipe 11 and the signal wiring 12 of this indoor unit is normal, and four sets of the four sets provided on the board of the outdoor controller 4 are provided. 7 segment L
This is indicated by blinking on the display consisting of ED, and the temperature difference ΔT ₁ ,
If ΔT ₂ and ΔT ₃ are equal to or less than the predetermined temperature difference, it is determined that there is an abnormality, and the display section flashes that fact.

FIG. 2 shows the temperature detected by the heat exchange temperature sensor 9 in the trial operation, that is, the change over time of the refrigerant temperature at the inlet of the indoor heat exchanger 5. When the operation of the air conditioner is started, the detected temperature gradually decreases due to the refrigerant evaporating and vaporizing in the indoor heat exchanger 5, and becomes a steady state after 25 minutes.

Then, the detected temperature starts to rise by temporarily stopping the operation. Temperature when stopped for 3 minutes
T ₁ , T ₂ , T ₃ are detected and stored. Then, the compressor 1
Also, the detected temperature gradually and rapidly decreases by operating the outdoor blower 3 and fully opening the electric expansion valve 7 with the indoor blower 6 stopped.

Detected temperature when 20 seconds have passed in this state
t _1, t _2, t ₃ is reduced refrigerant pipe 11 and the signal wiring 12 is previously detected temperatures T ₁ if it is normally connected, T _2, T ₃ or 7 degrees ° C. than, but if mis-connection, Does not drop more than 7deg ° C.

[0017]

According to the present invention, the air conditioner is operated by the signal from the controller of the outdoor unit after the installation work is completed, the operation is temporarily stopped after a predetermined time has elapsed, and each indoor unit is operated after the set time has elapsed after the stop. The temperature of the refrigerant at the inlet of the heat exchanger is detected and stored, and then the compressor and outdoor blower of the outdoor unit are restarted, the indoor blower of each indoor unit is stopped, and its electric expansion valve is fully opened. In this state, the temperature of the refrigerant at the inlet of the indoor heat exchanger of each indoor unit is detected after the set time has elapsed, and if the temperature difference between this and the stored value is greater than or equal to the predetermined temperature difference, then the refrigerant piping and signal wiring are normal. Is displayed on the display of the controller of the outdoor unit, and if the temperature difference is less than the specified temperature, an error is displayed on the display, so the refrigerant piping and signal wiring are properly Since whether it is continued easily, quickly detected, it can shorten the working time of commissioning.

If the display section is composed of four sets of 7-segment LEDs provided on the controller board of the outdoor unit and the normality and abnormality are indicated by blinking, the normality and abnormality can be easily known.

[Brief description of the drawings]

FIG. 1 is a flowchart showing an embodiment of the present invention.

FIG. 2 is a diagram showing a temporal change in temperature of the indoor heat exchanger in the embodiment.

FIG. 3 is a system diagram of a multi-type air conditioner.

Front page continuation (72) Minor Hanai 1 Takamichi, Iwazuka-cho, Nakamura-ku, Nagoya-shi, Nagoya Research Laboratory, Mitsubishi Heavy Industries (72) Inventor Michio Yoneda 1 Takamichi, Iwatsuka-machi, Nakamura-ku, Nagoya Mitsubishi Heavy Industries Ltd. Company Nagoya Research Laboratory (72) Inventor Tadahiro Kato 3-1, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory

Claims (2)

[Claims] 1. A multi-type air conditioner in which a plurality of indoor units are connected to one outdoor unit via refrigerant piping and signal wiring, and a signal from a controller of the outdoor unit is used after installation work is completed. Operate the air conditioner, stop the operation once after a lapse of a predetermined time, detect the refrigerant temperature at the heat exchanger inlet of each indoor unit and store it after the set time elapses after stopping, and then store it in the outdoor unit. Restart the compressor and the outdoor blower, stop the indoor blower of each indoor unit, and fully open the electric expansion valve of the indoor unit.In this state, the refrigerant temperature at the inlet of the indoor heat exchanger of each indoor unit is adjusted. If the temperature difference between the detected value and the stored value is equal to or larger than the predetermined temperature difference, it is confirmed that the refrigerant pipe and the signal wiring are normally connected. The method of commissioning multi-type air conditioner which is characterized in that the display on the display unit, and displays the abnormality on the display section is equal to or less than a predetermined temperature difference. 2. The multi-type according to claim 1, wherein the display section is composed of four sets of 7-segment LEDs provided on the board of the controller of the outdoor unit, and normal / abnormality is displayed on the display by blinking. Air conditioner trial run method