JPH03225146A - Operation control method for air conditioner - Google Patents

Abstract

PURPOSE:To prevent a dwelling person from feeling an uncomfortable feeling after stopping a heating operation by a method wherein a surplus heat purging time after stopping the heating operation is divided into some segments and set at any one of them in response to a duration of an operating time of an electrical heater or a combustion device and an indoor fan is controlled for its operation in response to the surplus heat purging time. CONSTITUTION:An indoor control part 4 has a function for sensing an electrical energization time for an electrical heater 7. When it is assumed that the heating operation is stopped and an electrical energization time of the electrical heater 7 just before stopping operation is less than 5 minutes or so, a surplus heat purging time (t) is set to 30 seconds. If it is assumed that an electrical energization time of the electrical heater 7 just before the stopping operation exceeds 5 minutes, the surplus heat purging time (t) is set to one minute. An indoor fan motor 6 performs a fine wind operation in response to the surplus heat purging time so as to discharge the surplus heat in the indoor device 2 and the air conditioner shows all stopped operations at a time when the surplus heat purging time (t) elapses.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an air conditioner, and more specifically, to an indoor air conditioner for removing residual heat after the operation of an air conditioner equipped with an electric heating device or a combustion device is stopped. The present invention relates to a fan motor operation control method.

[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.

In order to compensate for this drawback, an electric heating device or the like 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 compensate for the insufficient heating capacity. I have to.

By the way, in such an air conditioner, if the electric heating device is in operation when the operation is stopped, the temperature of the surrounding area will rise due to the residual heat of the electric heating device, and this temperature rise will damage the parts around the electric heating device. Since there is a risk of damage to the indoor fan motor, the indoor fan motor is kept running for a certain period of time even after the heating operation has stopped to remove residual heat.

[Problem to be solved by the invention]

However, the operating time of the indoor fan motor for removing residual heat is determined based on the assumption that the electric heating device is operated for a long time and the temperature is completely saturated.

Therefore, even if the operating time of the electric heating device is short and the temperature is low, the indoor fan motor will continue to operate for a certain period of time, and during this residual heat removal operation, cold air will be blown out, making the occupants feel uncomfortable. There was a problem.

Therefore, in the present invention, the above problems are solved,
It is an object of the present invention to provide a method for controlling the operation of an air conditioner so that occupants in the room do not feel discomfort after the heating operation is stopped.

[Means to solve the problem]

The present invention has been made to solve the above-mentioned problems, and in an air conditioner equipped with an electric heating device or a combustion device to compensate for the lack of heating capacity during heating operation, each time the electric heating device or combustion device operates, The operating time is detected, the residual heat removal time after the heating operation is stopped is set according to the length of the detected operating time, and the operation of the indoor fan motor is controlled based on this residual heat removal time.

[Effect]

With the above operation control method, it is possible to set the residual heat removal time that corresponds to the operation time of the electric heating device or combustion device immediately before the air conditioner is stopped, and then operate the indoor fan motor based on the residual heat removal time. , residual heat can be eliminated.

〔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 on 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 controller 8 receiving this signal drives and controls the compressor 10 while obtaining information from the temperature detecting 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, if the heating capacity is insufficient at the start of the heating operation or during the heating operation, the indoor control unit 4 issues a control signal to automatically operate the electric heating device 7 to increase the heating capacity. .

Further, the indoor fan motor 7 is operated with a predetermined air volume (large) while the compressor 10 is in operation, and when the compressor 10 is stopped, it is operated with a light breeze until the next operation starts. .

The situation will be explained based on FIG.

Ta is the operation stop temperature of the compressor 10, Tb is the operation start temperature of the compressor 1o and operation stop temperature of the electric heating device 7, Tc is the operation start temperature of the electric heating device 7, and Tr is the indoor temperature detected by the temperature detection means 5. It's temperature.

In the figure, since the indoor temperature Tr at the start of the heating operation is lower than the electric heating device operation start temperature Tc, both the electric heating device 7 and the compressor 10 start operating, and at about the same time the indoor fan motor 6
will also be put into operation.

Thereafter, the electric heating device 7 is stopped when the indoor temperature Tr reaches the above-mentioned Tb, and thereafter starts operating when the indoor temperature Tr decreases to the above-mentioned Tc, and is stopped when the indoor temperature Tr reaches the above-mentioned rb.

On the other hand, the compressor 10 is stopped when the indoor temperature Tr reaches the Ta, and thereafter the indoor temperature Tr becomes the Tb.
When the temperature drops to Tr, the operation is started, and the indoor temperature Tr reaches the above Ta.
It is controlled to stop operation when it reaches .

As described above, the indoor fan motor 6 is operated with a large air volume when the heating operation starts, but when the compressor 10 is stopped, it is operated with a light breeze until the next operation starts.

In addition, the indoor control unit 4 that performs such operation control has an energization time detection function that detects the energization time to the electric heating device 7. The residual heat removal time is set separately, and the operation of the indoor fan motor 6 is controlled based on the residual heat removal time.

For example, the heating operation is stopped at point A shown in FIG.
Assuming that the energization time of the electric heating device 7 immediately before stopping is less than 5 minutes, the residual heat removal time t is 30 minutes as shown on the left side of FIG.
If the heating operation is stopped at time B shown in Fig. 2 and the energization time of the electric heating device 7 immediately before the stop exceeds 5 minutes, then as shown on the right side of Fig. 3, The residual heat removal time t is set to 1 minute, and based on this residual heat removal time, the indoor fan motor 6 is operated with a gentle breeze, and the indoor unit 2
The air conditioner is configured to remove residual heat inside the air conditioner and stop all operations when the residual heat removal time t has elapsed.

FIG. 4 is a flowchart showing this series of control operations. When heating operation is started, the indoor control unit 1 first turns on the electric heating device (heater) in step STI.
When the electric heating device 7 is turned on, a timer is started in step ST2 to count the time during which the electric heating device is energized.

In step ST3, it is determined whether the heating operation has been stopped, and the electric heating device is turned on or off until the heating operation is stopped.
The energization time is counted until it is turned off.

If the heating operation continues even after the electric heating device is turned off, the previously counted value is cleared and the system waits until the electric heating device is turned on again.

When the heating operation is stopped while both the electric heating device 7 and the compressor 10 are being operated in step ST3, step ST4
The process proceeds to step ST5, and determines whether the time during which the electric heating device was energized immediately before the heating operation was stopped is, for example, 5 minutes or more. If it is 5 minutes or less, the process proceeds to step ST5, and the air volume of the indoor fan is set to a gentle breeze operation. The operation of the indoor fan motor is controlled until 30 seconds have passed in step ST6.

If the determination result in step ST4 is that the time has exceeded 5 minutes, the process proceeds to step ST7, the air volume of the indoor fan is switched to light breeze operation as described above, and the operation of the indoor fan motor 6 is controlled until one minute has elapsed in step ST8. It is.

[Effects of the Invention] As described above, if the air conditioner is operated by the operation control method described above, the residual heat removal time can be set in accordance with the operating time of the electric heating device immediately before the air conditioner is stopped. Since the indoor fan motor can be operated based on the residual heat removal time, there is no waste in residual heat removal operation, saving power, and since cold air is not discharged into the room, it is possible to operate the indoor fan motor based on the residual heat removal time. There will be no discomfort caused to the person.

[Brief explanation of drawings]

Fig. 1 is a schematic block diagram of a control system of an air conditioner showing one embodiment of the present invention, Fig. 2 is an explanatory diagram of control operation of an electric heating device, etc. based on the same embodiment, and Fig. 3 is a heating system of the same embodiment. FIG. 4, which is an explanatory diagram of the control operation of the indoor fan motor after the operation is stopped, is a flowchart for explaining the operation of the main part of the indoor control section of the same embodiment. In the figure, 1--Remote controller, 2-Indoor unit/node, 3-Outdoor unit, 4-Indoor control section, 5--Temperature detection means,
6-Indoor fan motor, 7-Electric heating device, 8 System control unit, 9-Temperature detection means, 10-Compression monkey 11-Outdoor fan motor, 12-Four-way valve.

Claims (1)

[Claims] In an air conditioner equipped with an electric heating device or a combustion device to compensate for a lack of heating capacity during heating operation, an operating time is detected each time the electric heating device or combustion device operates, and the operation time is adjusted according to the detected operating time. 1. A method for controlling the operation of an air conditioner, characterized in that residual heat removal time after heating operation is stopped is set in sections, and the operation of an indoor fan motor is controlled based on the residual heat removal time.