JPH0331644A - Controller for air conditioner - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an improvement in a control device for an air conditioner, and particularly to one having a forced drainage device for drain water.

Conventional technology Generally speaking, in ceiling-suspended or built-in air conditioners, if the drain water cannot be drained naturally, the usual method is to store the drain water in a water tray and forcibly activate the drain drainage device to drain it. be. A liquid level detection device such as a float switch is still provided to prevent drain water from overflowing from the water tray in the event of a failure of the drain drainage device.

An example of the conventional air conditioner control device described above will be described below with reference to the drawings.

FIG. 3 is a schematic diagram showing the structure of the drain water receiving tray of the ceiling-embedded indoor unit 1. Indoor air is guided to the evaporator 3 by the fan 2 for heat exchange. Drain water generated in the evaporator 3 is allowed to flow down into a water tray 4. The liquid level detection device 6 disposed inside the water tray 4 drives the drain drainage device 6 to prevent more than a predetermined amount of drainage water from accumulating in the water tray. The liquid level detection device 5 is a sensor such as a float switch or a thermistor.

FIG. 4 is a block diagram showing the main parts that control the indoor unit, and includes operation commands from an operating device 7 such as a remote control (not shown), a liquid level detection device 6, and various sensors (not shown).
The control device 8 receives the state signal of the compressor 9, the fan motor 10, and the first timer 1.
Various actuators such as the drain drainage device 6, which are delayed in operation by 0a, are driven in a timely manner.

The operation of the air conditioner control device configured as described above will be explained below using the flowchart shown in FIG. 6.

First, in step 13, it is determined whether or not the liquid level detection device 5 is operating. In step 14, the full output of the actuators of the compressor 9, fan motor 101, and drain drainage device 6 are stopped in accordance with the procedure stored in the ROM in the microcomputer in the control device 8. Next, if the liquid level detection device 6 is not operating, in step 15, depending on whether an ON command is issued to the compressor 9 from the control device 8 due to the difference between the room temperature and the set temperature, if an ON command is issued. Step 16
The drain drainage device 6 is also turned on.

In addition, when the ON command to the compressor 9 is not issued, the first timer 10a set in the control device 8 is set to 5ETL.
(Step 17), this timer is set for a set time (e.g. 6
It is determined in step 18 whether or not the time period (minutes) has elapsed, and the drain drainage device 6 is turned on until the time elapses. After the set time has elapsed,
RESET the first timer 10a (step 19)
, in step 20, the drain drainage device 6 is turned off.

In this way, when the compressor 9 is ON and when the compressor 9
is turned off, and the drain drainage device 6 is operated in a delayed manner until the set time elapses, and when the set time has elapsed, the drain drainage device e is turned off. If the liquid level detection device 5 is still activated, the full output is stopped.

Problems to be Solved by the Invention However, the above configuration has the following problems.

That is, the liquid level detection device 6 is activated by the drain drainage device 6.
Not only when there is a malfunction, but also because the construction of the water pipe that drains drain water from indoor unit 1 to the outside is poor, and drainage is not performed properly, causing drain water to flow backwards or drain water from other indoor units to flow in. It may operate in some cases. In such a case, the liquid level detection device 6 is activated and the full output is stopped even though the drain drainage device 6 is not malfunctioning.

Not only that, but drain water may overflow from the water tray, causing a water leak. Another problem was that the system could not be restarted until the liquid level detection device 5 was restored, that is, unless the drain water in the water tray naturally evaporated or the water was forcibly drained.

In view of the above problems, the present invention provides a control device for a drain drainage device for optimally operating an air conditioner.

Means for Solving the Problems In order to solve the above problems, the air conditioner control device of the present invention forcibly drives the drain drainage device for a certain period of time based on the detection signal of the liquid level detection device, and after the certain period of time has elapsed, the air conditioner control device of the present invention When the detection signal from the liquid level detection device is not released, the stop signal generating means generates a stop signal to stop the indoor unit.

Effects of the present invention With the above-described configuration, when drain water accumulates in the water tray, the drain water is forcibly drained by driving the drain water drainage device based on the detection by the liquid level detection device, and after a certain period of time has elapsed. If the detection signal of the liquid level detection device is not released, it is determined that the drain drainage device has failed and drainage is impossible, and the system is shut down to ensure smooth operation of the air conditioner.

Example An embodiment of the present invention will be described below with reference to the drawings.

Components that are the same as those in the conventional example are given the same reference numerals and descriptions thereof will be omitted.

FIG. 1 is a block diagram showing the configuration of a control device for an air conditioner in an embodiment of the present invention. In Fig. 1, 6 is a liquid level detection device, 8 is a drain drainage device, 7 is an operating device, and 9 is a liquid level detection device.
1 is a compressor, and 1o is a fan motor, which is the same as the conventional example. 8 is the control device and there is a drain drainage device 6 inside.
A first timer 10a and a second timer 10b are provided to delay operation of the compressor 9, the drain drainage device 6, etc. by performing logical operations according to a preset program.

Next, the operation of the above configuration will be explained using the flowchart shown in FIG.

First, in step 21, it is determined whether or not the liquid level detection device 6 is operating. If it is operating, the drain drainage device 6 is turned on in step 22, and in step 23, the second level detection device 6 set in the control device 8 is turned on. A timer is set, and it is determined in step 24 whether the timer has elapsed for a set time (for example, 5 minutes). The flow from steps 21 to 24 is executed until the set time elapses, and after the set time elapses, the second step is executed in step 26.
RESET the timer and in step 26 compressor 9.7 unmotor 10. The full power output of the actuator of the drain drainage device 6 is stopped according to the procedure within the control device 8.

Next, in step 24, if the liquid level detection device 5 returns in step 21 while the set time has elapsed, the process moves to step 27. In step 27, depending on whether an ON command is issued to the compressor 9 due to the difference between the room temperature and the set temperature from the control device 8, if an ON command is issued, the drain drainage device 6 is also turned on in step 28. Also, if the ON command to the compressor 9 is not issued,
The first timer set in the control device 8 is set to 5ETL.
(Step 29), this timer is set for a set time (e.g. 6
It is determined in step 3o whether or not a minute) has elapsed, and the drain drainage device 6 is turned on until the time elapses.

After the set time has elapsed, reset the first timer.

(Step 31), and in Step 32, the drain drainage device 6 is turned off.

As described above, according to this embodiment, the drain drainage device 6 is forcibly driven for a set time by the detection signal from the liquid level detection device 6, and the detection signal from the liquid level detection device 5 is not released after a certain period of time has elapsed. At this time, actuators such as the compressor 9 can be stopped.

Effects of the Invention As described above, the present invention provides a drain drainage device that discharges drain water, a liquid level detection device that detects when the amount of drain water in a water tray reaches a predetermined value, and an operation of the drain drainage device and a liquid drainage device. A control device is provided to control whether or not the surface detection device detects the liquid level, and the control device forcibly drives the drain drainage device for a certain period of time in response to a detection signal from the liquid level detection device;
By providing a stop signal generation means that issues a stop signal when the detection signal from the liquid level detection device is not released after a certain period of time has elapsed, drain water is forcibly drained when the liquid level detection device detects it. If the detection signal of the liquid level detection device does not clear even after a certain period of time has elapsed, it will be determined that the drain drainage device has failed and drainage is not possible, and the system will be shut down, ensuring smooth operation of the air conditioner. .

[Brief explanation of drawings]

Fig. 1 is a block diagram showing the configuration of the air conditioner control device of the present invention, Fig. 2 is a flowchart showing the operation of the 7" o-diagram showing the configuration of Fig. 1, and Fig. 4 is a schematic diagram showing the configuration of a conditioner, FIG. 4 is a block diagram showing the configuration of a conventional air conditioner control device, and FIG. 5 is a flowchart showing the operation of the block diagram showing the configuration of FIG. 3. . . . Water pan, 6 . . . Drain drainage device, 5 . . . Liquid level detection device, 8 . . . Control device.

Claims (1)

[Claims] A water tray for storing drain water condensed on the evaporator, a drain drainage device for discharging the drain water collected in the water tray, and a liquid level detection device for detecting when the amount of drain water in the water tray has reached a predetermined amount. and a control device that controls the operation of the drain drainage device and the presence or absence of detection by the liquid level detection device,
This control device drives the drain drainage device for a certain period of time based on the detection signal from the liquid level detection device, and generates a stop signal that issues a stop signal when the detection signal from the liquid level detection device is not released after a certain period of time. 1. A control device for an air conditioner, characterized by comprising means.