JPH0484060A - Air conditioner - Google Patents

Abstract

PURPOSE:To sufficiently provide running capacity of a compressor when an electric heating device is turned OFF by a method wherein when the electric heating device is turned OFF, the compressor of an outdoor machine is run within a preset higher limiting current value, and when the electric heating device is turned ON, the compressor is run within a limiting current value obtained by subtracting the consumed current value of the electric heating device from the high limiting current value. CONSTITUTION:When information fed from an indoor control part 4 to an outdoor control part 8 does not bring an electric heating device 7 into an ON-state, the limiting current value of a compressor 10 is set to an ordinary high value, and this state is maintained. When information brings the electric heating device into an ON-state, the limiting current value of the compressor 10 is reset to a value obtained by subtracting the consumed current value of the electric heating device 7 from an ordinary high value. As long as no information to report that the electric heating device 7 is brought into an OFF-state is fed to the outdoor control device 8, control is effected so that the limiting current value of the compressor 10 is not restored to an ordinary high value. Namely, the current limit value of the compressor 10 is regulated according to the ON/OFF state of the electric heating state 7, and when the electric heating device 7 is turned OFF, running capacity of the compressor is sufficiently displayed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an air conditioner having an electric heating device as an indoor unit, and more specifically, when the electric heating device is turned off, the air conditioner is heated. Concerning means for increasing driving ability.

[Conventional technology]

Due to the characteristics of heat pump type air conditioners that can be used for both cooling and heating, when the outside temperature drops, the heating capacity also decreases.

To compensate for this drawback, an electric heating device is installed on the indoor unit side, and if the heating capacity is insufficient at the start of heating operation or during heating operation,
The electric heating device is automatically activated to increase heating capacity.

By the way, when this electric heating device is turned on, the current consumption value of the electric heating device is added to the current consumption value of the compressor, fan motor, etc., and exceeds the preset total current value of the air conditioner.

Therefore, in order to avoid such problems, conventionally, the current limit value of the compressor installed on the outdoor unit side was set to a lower value by subtracting the current consumption value of the electric heating device, as shown in Fig. 5. As shown, even when the electric heating device is turned on, the total current value of the air conditioner does not change.

[Problem to be solved by the invention]

However, with the method of determining the current limit value of the compressor as described above, even when the electric heating device is turned off, the current limit value of the compressor is always equal to the current consumption value of the electric heating device. Therefore, there was a problem that the operating capacity of the compressor could not be fully demonstrated.

Therefore, it is an object of the present invention to provide an air conditioner that can solve these problems and allow the compressor to fully utilize its operating capacity when the electric heating device is turned off.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned problems, and in an air conditioner in which the indoor unit is equipped with an electric heating device, when the electric heating device is turned off, the compressor installed in the outdoor unit is turned off. Operates within a preset higher current limit value, and when the electric heating device is turned on, operates within a current limit value obtained by subtracting the current consumption value of the electric heating device from the higher current limit value. I did it like that.

[Operation] With the above configuration, when the electric heating device is turned on, the current limit value of the compressor is reduced by the current consumption value of the electric heating device, so that the preset total current value of the air conditioner is reduced. When the electric heating device is turned off, the current limit value of the compressor can be increased by the current consumption value of the electric heating device, so that the operating capacity of the compressor can be fully utilized. be able to.

〔Example〕

Hereinafter, one embodiment of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 is a block diagram schematically showing the control system of an air conditioner, in which 1 is a remote control, 2 is an indoor unit having an electric heating device to compensate for insufficient heating capacity during heating operation, and 3 is an outdoor unit.

When the indoor control section 4 of the indoor unit 2 receives an operation signal from the remote controller 1, it reads the indoor temperature sent from the temperature detection means 5 and issues an instruction for operating conditions.

There are two systems of operation commands issued by the indoor control section 4, one for controlling the indoor fan motor 6 and the electric heating device 7, and the other for sending operating condition signals to the outdoor control section 8 of the outdoor unit 3.

The outdoor control unit 8 receiving this signal drives and controls the compression@10 while obtaining information from the temperature detection means 9 that detects the outdoor temperature and the like.

In addition, the outdoor control unit 8 controls the outdoor fan motor 11 to 0N10.
A command is issued to the four-way valve 12 that switches the refrigeration cycle during the FF command, during cooling and heating, or during defrosting operation.

The indoor control section 4 and the outdoor control section 8 constantly exchange signals while the air conditioner is operating, and the outdoor control section 8 interprets and executes the operating conditions commanded by the indoor control section 4, and displays the current operating status indoors. A reply is sent to the control unit 4.

By the way, in the present invention, as shown in FIG. 2, the current limit value of the compressor 10 is set high while the electric heating device 7 is turned off, and the electric heating bag W7 is When turned on, the current limit value of the compressor 10 is reduced by the amount of current consumed by the electric heating device 7, and the electric heating device 7 is turned off.
When F is applied, the current limit value of the compressor 10 is controlled to be increased by the amount of current consumed by the electric heating device 7.

A flowchart of the process is shown in FIG. 3. On the indoor unit 2 side, the indoor control unit 4 determines whether or not to turn on the electric heating device 7 based on information from the temperature detection means 5 (step 5T1). If there is no need to turn on the device 7, the electric heating device is turned off in step ST2, a signal to turn off the electric heating device is sent to the outdoor control unit 8 in step ST3, and step ST4 is executed as long as there is no change in the determination in step STI. , the above series of operations is repeated.

If it is necessary to turn on the electric heating device 7 based on the determination in step STI, the outdoor control unit 8 is turned on in step ST5.
In step ST6, the electric heating device 7 is turned on, and unless there is a change in the determination in step STI, the electric heating device 7 is controlled to be in the ON state.

FIG. 4 is a flowchart for explaining the control of the current limit value of the compressor 10 installed on the outdoor 1!3 side.
The TI determines whether the information regarding the electric heating device sent from the indoor control section 4 to the outdoor control section 8 is to turn on the electric heating device, and if the electric heating bag W7 is not turned on, the compressor is turned on in step Sr1. The current limit value of 10 is set to a normal high value, and in step ST3, this state is maintained as long as there is no change in the determination in step STI.

Further, if the information regarding the electric heating device sent from the indoor control section 4 to the outdoor control section 8 is determined in step STI and the electric heating device is to be turned on, the compressor lO is turned on in step ST4. The current limit value was reset from the normal high value to a low value that reduced the current consumption of the electric heating device 7, and information notifying that the electric heating device 7 was turned off was not sent to the outdoor control unit 8. The current limit value of the compressor 10 is controlled so as not to return to the normal high value.

That is, the current limit value of the compressor 10 is increased or decreased in accordance with the 0N10FF state of the electric heating device 7, and the electric heating device 7 is turned off.
When the compressor is set to F, the operating capacity of the compressor is fully demonstrated.

〔Effect of the invention〕

If the air conditioner is as explained above, the current limit value of the compressor is automatically switched in accordance with the ON10 F F state of the electric heating device, so the total current of the air conditioner that has been set in advance is It is safe because it will not be operated beyond the specified value, and when the electric heating device is turned off, the compressor can fully demonstrate its operating capacity, contributing to improving the performance of the air conditioner.

[Brief explanation of drawings]

Fig. 1 is a block diagram schematically showing the control system of an air conditioner according to an embodiment of the present invention, Fig. 2 is a time chart of switching the current limit value of the compressor according to the embodiment, and Fig. 3 is the same implementation. FIG. 4 is a control flowchart for the indoor side of the example, FIG. 4 is a control flowchart for the outdoor side of the same embodiment, and FIG. 5 is an explanatory diagram of the current limit value of the compressor showing a conventional example. In the diagram, I---remote control, 2-indoor unit, 3-outdoor unit, 4
- indoor control section, 5- temperature detection means, 6- indoor fan motor, 7- electric heating device, 8- outdoor control section, 9.- temperature detection means, 10- compressor, 11- outdoor fan motor, 12-.
Four-way valve. Patent applicant: Fujitsu General Ltd. Figure 1 Figure 3 Figure 4

Claims (1)

[Claims] In an air conditioner in which the indoor unit is equipped with an electric heating device, when the electric heating device is turned off, the compressor installed in the outdoor unit is operated within a preset high current limit value, and the electric heating device is turned off. An air conditioner characterized in that when the device is turned on, the air conditioner is controlled to operate within a current limit value obtained by subtracting the current consumption value of the electric heating device from the higher current limit value.