JP2000161799A - Controller for air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To permit a pump-down operator to recognize the finishing timing as well as the finishing degree of pump-down operation and permit the recovery of refrigerant surely from an indoor machine side to an outdoor machine side, upon the pump-down operation of an air conditioner, in which the outdoor machine and the indoor machine are installed separately. SOLUTION: A pump-down operation controller 34 is provided with a pump- down predetermined time setting means 24, setting a predetermined operating period of time based on an outside air temperature information detected by an outside air temperature detector 23, and a pump-down normal/abnormal finishing judging means 31. Accordingly, the pump-down operation is effected in accordance with the condition of the refrigerant while the finishing timing of the pump-down operation as well as the deciding result of normality or abnormality are indicated in an indicating means 33 whereby an operator can recognize the timing and result while the recovery of refrigerant from the indoor machine to the outdoor machine side can be effected surely.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an air conditioner in which an outdoor unit and an indoor unit are separately installed.

[0002]

2. Description of the Related Art Conventionally, in this type of air conditioner, a pump-down operation method for transferring refrigerant remaining in the piping of the indoor unit and the equipment to the outdoor unit side is disclosed in Japanese Patent Laid-Open Publication No. Hei.
There is one disclosed in Japanese Patent No. 157382.

Hereinafter, a description will be given with reference to the drawings. FIG. 5 shows a configuration and a control device of a refrigerant circuit of an air conditioner. 1 is an outdoor unit, 2 is an indoor unit, 3 is a switch of AC200V, 4 is a compressor whose operation is controlled by the switch 3, 5 Is an outdoor heat exchanger; 6 is a discharge pipe service valve for manually shutting off refrigerant flowing from the outdoor unit 1 to the indoor unit 2;
Is an indoor heat exchanger, and 8 is a suction pipe service valve for manually shutting off the refrigerant flowing from the indoor unit 2 to the outdoor unit 1. Reference numeral 9 denotes an operation switch for recognizing a start input of the pump-down operation, reference numeral 10 denotes a timer for measuring the pump-down time, and reference numeral 11 denotes a pump-down time comparison for comparing the pump-down time with a predetermined pump-down predetermined time. Means 12 are switch control means for controlling the switch by comparing the time measured by the time measuring means 10 with a predetermined pump down time by the pump down time comparing means 11.
Reference numeral 13 denotes a pump-down operation controller constituted by the switch control means 12, the pump-down time comparing means 11, and the time keeping means 10.

FIG. 6 is a flowchart showing a pump down operation. The operation will be described below.

The switch control means 12 is operated by an operation switch 9.
To start pump-down operation (STEP1)
Then, the pump-down operator manually closes the discharge pipe service valve 6 (STEP 2).

The predetermined time of the pump-down operation is uniquely set by the pump-down time comparing means 11 (STEP 1).
3) Then, the switch 3 is closed, the compressor 4 starts (STEP 4), and the collection of the refrigerant to the outdoor unit 1 starts.
At the same time, a timer in the timer 10 for counting the time from the start of the compressor 4 starts (STEP 5).

The operation of the compressor 4 continues until the pump down time comparison means 11 determines that the pump down time> the pump down predetermined time (STEP 6).

The pump-down time> the predetermined pump-down time and the work ends. However, immediately before the compressor stops, the pump-down operator manually closes the suction pipe service valve 8 (STEP 7), and the switch control means 12 opens and closes the valve. Vessel 3
Is opened to stop the compressor 4 (STEP 8), and then the timer count in the timer 10 is reset (STEP 9).

[0009]

However, in the conventional configuration, the predetermined operation time of the compressor due to the pump-down operation is uniquely set. Therefore, depending on the state of the outside air temperature, the refrigerant is not completely recovered to the outdoor unit side. When the compressor is stopped and the refrigerant recovery is incomplete and the work is terminated, or when the worker cannot confirm the degree of completion of the refrigerant recovery and the indoor and outdoor refrigerant pipes are removed, the refrigerant leaks to the outside and protects the environment. There is also a possibility that a problem may arise from the point of view.

The present invention solves such a conventional problem, and the remaining time of a predetermined time of the pump-down operation set by the outside air temperature and the refrigerant pressure and an operation time from the start of the compressor operation. The purpose of the present invention is to provide a control device that informs an operator of the timing of the end of the pump-down operation, causes the suction pipe service valve to "close" properly, and reliably recovers the refrigerant.

[0011]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a predetermined pump-down time setting means for setting a time required for pump-down according to an outside air temperature and a refrigerant pressure; The pump-down operation controller is provided with a display means for displaying the remaining operation time from the start of the compressor operation.

By the pump-down operation controller, an appropriate pump-down operation can be automatically performed according to a change in the refrigerant state, and the refrigerant can be reliably collected from the indoor unit to the outdoor unit.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS To solve the above-mentioned problems, the present invention provides a receiver for recognizing a pump-down operation start signal on the outdoor unit side, and a refrigerant pressure detector for detecting the refrigerant pressure on the suction side of the compressor. An outdoor temperature detector that detects an outdoor air temperature, a switch that opens and closes a power supply circuit to the compressor is provided, and the refrigerant pressure detector and the refrigerant pressure and the external temperature detected by the external air temperature detector are used. Pump-down predetermined time setting means for setting a pump-down time; timer means for measuring a pump-down time from a point in time when a refrigerant pressure detected by the refrigerant pressure detector during a pump-down operation has become equal to or lower than a predetermined pressure; The switch-down is operated by a pump-down start signal from the pump, and the pump-down time measured by the timing unit from the predetermined pump-down time set by the predetermined pump-down time setting unit. Display means for displaying the time obtained by subtracting, those provided with the pump-down operation control apparatus provided with a switch control means for terminating the operation of said switch by a pump-down completion signal from the receiver. As described above, the pump-down operation controller is provided with the pump-down predetermined time setting means for setting the time required for the pump-down operation based on the outside air temperature and the refrigerant pressure, and the display means for displaying the end timing of the pump-down operation. The worker can confirm the timing of the end of the work, and can reliably collect the refrigerant from the indoor unit to the outdoor unit.

Further, the pump-down operation control device having the above-mentioned structure is provided with a pump-down operation abnormal termination determining means for determining the degree of completion of refrigerant recovery. As described above, the operator can confirm the degree of completion of the refrigerant recovery by the pump-down operation abnormal end determination means, and can more reliably recover the refrigerant, thereby improving environmental protection.

[0015]

Embodiments of the present invention will be described below with reference to the drawings. The same components as those in the related art are denoted by the same reference numerals, and detailed description is omitted.

(Embodiment 1) In FIG. 1, reference numeral 21 denotes a refrigerant pressure detector for detecting a refrigerant pressure of a suction pipe of a compressor 4;
2 is a receiver for recognizing the control signal of the pump-down operation, 2
3 is an outside air temperature detector for detecting the outside air temperature around the outdoor unit 1;
24 is a pump down predetermined time setting means for setting a pump down predetermined time based on the outside air temperature detected by the outside air temperature detector 23, 25 is a clocking means for measuring the pump down operation time,
26 is a difference between the predetermined time set by the predetermined pump-down time setting means 24 and the actual pump-down operation time;
That is, the remaining operation time is displayed on the display means 27, and the switch control means for controlling the opening and closing of the switch 3 based on the information from the receiver 22. The switch control means 26 and the timekeeping means 2
5 and a pump down operation controller comprising a pump down predetermined time setting means 24.

The operation of the air-conditioning apparatus having the above-described structure in the pump-down operation will be described.

As shown in FIG. 2, when the receiver 22 receives the pump down operation start signal (STEP 1), the information is transmitted to the switch control means 26, and the pump down operation is started. The pump down operator manually closes the discharge pipe service valve 6 (STEP
2).

At the same time, the outside air temperature information from the outside air temperature detector 23 is transmitted to the switch control means 26, and the predetermined pump down operation time is set by the predetermined pump down time setting means 24 (STEP 3).

Thereafter, the switch control means 26 controls the switch 3
Is performed, and the compressor 4 starts (STEP 4).
The collection of the refrigerant from the indoor unit 2 to the outdoor unit 1 starts, and the receiver 22 receives the pump down stop signal (STE).
Continue operation until P5).

At the same time, a comparison between the refrigerant pressure detected by the refrigerant pressure detector 21 and the low pressure is made by the switch control means 26.
(STEP 6), when it is determined that the refrigerant pressure is lower than the low pressure, a timer is started in the timer 25 (STEP 7), and a predetermined pump down time-timer count time is calculated (STEP 8). It is displayed by the display means 27 (STEP 9).

In the operations in STEPs 8 and 9, the pump-down stop signal is received by the receiver 22 (STEP 10).
Executed until

After confirming the display means 27 and the pump-down operator manually closes the suction pipe service valve 8 (STEP 11), when the receiver 22 receives a pump-down stop signal, this information is opened and closed. Container control means 26
And the switch 3 is opened (STEP 1).
2) At the same time when the compressor 4 stops, the timer count time in the timer 25 is reset (STEP 13), and the pump-down operation ends normally.

In steps 5 and 10, the receiver 2
If the pump-down stop signal is forcibly received by the switch 2, the switch control means 26 opens the switch 3 (STEP 12), stops the compressor 4 and resets the timer count time in the timer 25. (ST
EP13) The pump-down operation is terminated.

As described above, the pump down predetermined time setting means 24 for setting the predetermined time of the pump down operation in accordance with the outside air temperature condition and the display means 27 for displaying the predetermined pump down time-timer count time are controlled by the pump down operation control. Since it is provided in the unit 28, during the pump down operation, the pump down operator is made aware of the timing of the pump down end, and the refrigerant can be reliably collected from the indoor unit 2 to the outdoor unit 1 side.

(Embodiment 2) In FIG. 3, reference numeral 31 denotes a pump down normal / abnormal end determining means. When a pump down operation is terminated by a pump down stop signal, a predetermined pump down time and a timer count time, that is, a pump down time, are set. Are compared, and if the predetermined pump-down time is shorter than the pump-down time, it is determined to be normal. Reference numeral 32 denotes switchgear control means, which is counted by the refrigerant pressure information from the refrigerant pressure detector 21, the outside air temperature information from the outside air temperature detector 23, the pump-down operation control signal from the receiver 22, and the timer unit 25. Based on the pump down time, the predetermined pump down time set by the predetermined pump down time setting means 24, and the determination information of the pump down normal / abnormal end determination means 31, the opening and closing of the switch 3 is controlled to obtain the pump down information. This is to be displayed on the display means 33. 3
Reference numeral 4 denotes a pump-down operation controller constituted by a switch control means 32, a display means 33, a timer means 25, a pump-down predetermined time setting means 24, and a pump-down normal / abnormal end determination means 31.

The operation of the air conditioner constructed as described above for the pump-down operation will be described.

As shown in FIG. 4, when the receiver 22 receives the pump down operation start signal (STEP 1), the information is transmitted to the switch control means 32 to start the pump down operation.

Immediately before the start of the operation, the pump-down operator manually closes the discharge pipe service valve 6 (ST
EP2).

Next, a predetermined pump-down operation time is set by the predetermined pump-down time setting means 24 based on the external air temperature information from the external air temperature detector 23 transmitted via the switch control means 32 (STEP 3).

Thereafter, the switch 3 is closed by the switch control means 32, the compressor 4 is started (STEP 4), and the recovery of the refrigerant to the outdoor unit 1 starts. And the receiver 22
Receives the pump down stop signal (STEP)
The operation is continued until 5), but at the same time, the refrigerant pressure detector 2
The magnitude of the refrigerant pressure detected by step 1 is compared with the predetermined pressure by the switch control means 32 (STEP 6).

If the refrigerant pressure is less than the predetermined pressure, the timer of the timer 25 is started (STEP 7), and the predetermined pump-down time-timer count time is calculated (S7).
(Step 8) The result is displayed by the display means 33 (STEP 9).

In the operations in STEPs 8 and 9, the pump-down stop signal is received by the receiver 22 (STEP 10).
Executed until After the pump down operator manually closes the suction pipe service valve 8 (STEP 11),
When the pump-down stop signal is received by the receiver 22, the pump-down normal / abnormal end determining means 31 compares the predetermined pump-down time with the length of the timer count time (STEP 12), and determines the predetermined pump-down time-timer count time ≦ If it is determined to be 0, the pump-down is normally terminated (STEP 13).
(EP14) is displayed on the display means 33, and at the same time, the switch 3 is opened by the switch control means 32 (STEP 1).
5) The compressor 4 is stopped and the timer count time in the timer 25 is reset (STEP 16), and the pump-down operation ends.

If a pump down stop signal is received by the receiver 22 in STEP 5, a pump down abnormal end (STEP 14) is displayed on the display means 33, and the program proceeds to (STEP 15) and (STEP 16) to perform pump down. The operation is terminated.

As described above, in the case of this embodiment, the pump-down operation controller 28 in the first embodiment determines whether the pump-down operation is completed when the pump-down operation is completed. 31 and a display means 33 for displaying the result, the operator can recognize whether the pump-down operation is necessary or not, and the indoor unit 2 to the outdoor unit 1
The operation of collecting the refrigerant to the side can be performed without error.

[0036]

As described above, according to the present invention, a predetermined pump-down time setting means for setting a predetermined time of the pump-down operation according to the outside air temperature, and a predetermined pump-down time-timer count time are displayed. Since the display means is provided in the pump-down operation controller, the operator can recognize the timing of the end of the pump-down operation during the pump-down operation, and can reliably collect the refrigerant from the indoor unit to the outdoor unit.

When the pump-down operation is completed, the degree of completion of the pump-down operation is determined.
Since the pump-down operation controller is provided with the abnormal termination determination means and the display means for displaying the result, the operator can recognize whether the pump-down operation is necessary, and can reliably collect the refrigerant from the indoor unit to the outdoor unit, Even in the work of removing the pipe between the indoor unit and the outdoor unit, it is possible to improve the environmental protection without leaking the refrigerant to the outside.

[Brief description of the drawings]

FIG. 1 is a structural diagram of a refrigerant circuit of an air conditioner and a block diagram of a control device according to a first embodiment of the present invention.

FIG. 2 is an operation flowchart of the control device.

FIG. 3 is a configuration diagram of a refrigerant circuit of an air conditioner and a block diagram of a control device according to a second embodiment of the present invention.

FIG. 4 is an operation flowchart of the control device.

FIG. 5 is a configuration diagram of a refrigerant circuit of a conventional air conditioner and a block diagram of a control device.

FIG. 6 is an operation flowchart of the control device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 21 Refrigerant pressure detector 22 Receiver 23 Outside air temperature detector 24 Pump down predetermined time setting means 25 Clocking means 26, 32 Switch control means 27, 33 Display means 28, 34 Pump down operation controller 31 Pump down normal / abnormal end Judgment means

Claims (2)

[Claims] 1. An air conditioner in which an outdoor unit and an indoor unit are separately installed, a receiver for recognizing a pump-down operation start signal on the outdoor unit side, and a refrigerant for detecting a refrigerant pressure on a suction side of the compressor. A pressure detector, an outside air temperature detector that detects an outdoor air temperature, and a switch that opens and closes a power supply circuit to the compressor, and a refrigerant pressure detected by the refrigerant pressure detector and the outdoor air temperature detector A predetermined pump-down time setting means for setting a predetermined pump-down time according to the outside air temperature; and a timer for measuring a pump-down time from a point in time when the refrigerant pressure detected by the refrigerant pressure detector during the pump-down operation becomes equal to or lower than a predetermined pressure. Means, and the switch is operated by a pump-down start signal from the receiver, and the time-measuring means measures time from a predetermined pump-down time set by the predetermined pump-down time setting means. A pump-down operation controller provided with display means for displaying a time obtained by subtracting a pump-down time to be performed, and switch control means for terminating the operation of the switch in response to a pump-down end signal from the receiver. A control device for an air conditioner, comprising: 2. Display means for displaying that the pump-down operation has been completed while the pump-down predetermined time set by the predetermined-pump-down time setting means is longer than the pump-down time measured by the timer means via the switch control means. 2. A pump-down operation controller according to claim 1, further comprising: a pump-down operation controller for making the pump-down operator recognize that the pump-down operation is insufficient by the display means. Harmonizer control device.