JPH01111170A - Controller for air conditioner - Google Patents

Abstract

PURPOSE: To perform normal operation instantaneously by opening a two-way valve conducting between the delivery side and the suction side simultaneously upon stoppage of a compressor if an overload protector or a room temperature thermistor functions at the time of collecting refrigerant during heating operation thereby balancing suction and delivery pressures of a compressor quickly. CONSTITUTION: Upon receiving a heating operation start command, a room temperature thermistor 13 detects room temperature and if it is lower than a set level, a four-way valve 2 and a compressor 1 are turned on to collect refrigerant. If the thermistor 13 or the overload protector OLP 15 for the compressor function during that time period of about 90 sec, the compressor 1 is turned off and a two-way valve 10 is turned on to balance suction and delivery pressures of the compressor 1 quickly so that the compressor 1 can be operated instantaneously upon resetting the thermistor 13 or the OLP 15. When the compressor 1 is turned on again, the two-way valve 10 is turned off to collect refrigerant again. Upon finishing collection of refrigerant 90 sec later, a two-way valve 10 is turned on to feed refrigerant to a refrigerant heater and combustion is started to continue heating operation.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a control device for an air conditioner equipped with a refrigerant heating device.

Conventional technology In recent years, there have been 21 air conditioners equipped with refrigerant heating devices. It has been north of the state.

An example of an air conditioner equipped with the above-mentioned refrigerant heating device will be described below with reference to the drawings.

FIGS. 3 and 4 show a refrigeration cycle diagram and a flowchart of an air conditioner equipped with a conventional refrigerant heating device. In Fig. 3, 1 is a compressor, 2 is a four-way valve that switches the flow of refrigerant, 3 is an indoor heat exchanger on the user side, 4 is a two-way valve that flows refrigerant to a refrigerant heating device for heating, and 5 is a four-way valve that switches the flow of refrigerant. A refrigerant heating device that is a heat source for heating, 6 an outdoor heat exchanger for cooling, 7 a check valve that stops the flow of refrigerant during heating, 8 a pressure reducer for cooling, and 9 a check valve that stops the flow of refrigerant during heating. It is.

10 is a two-way bypass valve for reducing the input to the compressor 1 during heating. 11 is a compressor overload protection device, 1
2 is a control device.

An air conditioner equipped with a refrigerant heating device configured as described above will be explained according to the flowchart shown in FIG. 4.

After starting operation, when cooling is selected, the compressor 1 is turned on, and the refrigerant flows into the flow 3 in the direction of the broken line arrow in Fig. 3. The indoor heat exchanger 3, which is the user side, becomes low temperature and low pressure, and the air conditioning is turned on. Cooling operation will continue until it becomes possible and a stop command is received.

When heating is selected, a refrigerant recovery operation is performed in which the refrigerant stored in the outdoor heat exchanger 6 is recovered into the heating cycle.

This can be done by turning on the four-way valve 2.
is connected to the suction side of compressor 1 through check valve 9.
By turning on the refrigerant, the refrigerant stored in the outdoor heat exchanger 6 is moved to the indoor heat exchanger 3, and the refrigerant is prevented from being stored in the outdoor heat exchanger 6, which is not used during heating. This refrigerant recovery work is time-controlled, and for a certain period of time (
A product that can be completed in 90 seconds has been commercialized.

That is, 90 seconds is sufficient time for refrigerant recovery under any conditions.

After this refrigerant recovery work, the two-way valve 4 is opened to allow the refrigerant to flow into the refrigerant heating device 5, and by turning on combustion, the indoor heat exchanger 3 becomes high temperature and high pressure, allowing heating operation. At this time, the compressor only needs to transport the refrigerant, and since it simply works as a refrigerant pump, even if the two-way valve 10 is opened, the refrigerant can be transported sufficiently, and by opening the two-way valve 10, the compressor consumption Electric power can be reduced.

Problems to be Solved by the Invention However, in an air conditioner control device equipped with a refrigerant heating device configured as described above, the refrigerant recovery operation takes about 90 seconds, but during the recovery operation, the room temperature It often happens that the thermistor or compressor overload protection device (hereinafter referred to as OLP) is activated and the compressor is turned off.

Next, when the room temperature thermometer and OLP are restored and the compressor is to be operated, the pressure difference between the discharge and suction of the compressor is large, and the OLP of the compressor is activated again, causing the compressor to turn off. The refrigeration cycle for refrigerant recovery work includes two-way valves and check valves, so the pressure balance of the refrigerant cannot be achieved in a short period of time, so the OLP of the compressor has to work frequently, making it difficult for refrigerant recovery to take place. If the process cannot be completed, heating operation will not be possible. Furthermore, since the starting current of the compressor is approximately 40A, lights, etc., may flicker, which has led to complaints.

Means for Solving the Problems In order to solve the above-mentioned conventional problems, the present invention provides means for detecting the operation of a room temperature thermistor or OLP during refrigerant recovery work, and means for detecting the operation of the room temperature thermistor or OLP when the room temperature thermistor or OLP is operated. The compressor is stopped and the bypass two-way valve 1o is operated at the same time.

With the above-described configuration, the present invention maintains the discharge and suction pressure balance of the compressor by opening the bypass two-way valve 10 even when the compressor is stopped by the room temperature thermistor or OLP during refrigerant recovery. This allows for immediate normal operation without the OLP working again when the room temperature thermistor or OLP is restored.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to the drawings.

FIG. 1 is a control circuit diagram of this embodiment. Here, 6/,
− Explanation will be omitted for those with the same numbers as the conventional example.

In the figure, 13 is a room temperature detection thermistor, 14 is a power switch, and 15 is an OLP operation detection device. Also Ia
, 2a, 4a, 5a, and 10a are relays that respectively drive the compressor 1, the four-way valve 2, the two-way valve 4, the refrigerant heating device, and the two-way valve 10.

Next, the operation of the heating operation will be explained according to the flowchart shown in FIG.

When a command to start heating operation is received, the room temperature is detected by the room temperature thermistor 13, and if the room temperature is lower than the set value, the four-way valve 2 is turned on and the compressor 1 is turned on to recover the refrigerant. This time is approximately 90 seconds, during which time the room temperature thermistor 13 and O
When LP 15 operates, compressor 1 becomes 0FFl, three-way valve 1
o is turned on to quickly balance the discharge and suction pressures of the compressor 1, so that the compressor 1 can be operated immediately when the room temperature thermistor 13 and 0LP15 are restored.

When the compressor 1 is turned on again, the three-way valve 1o is turned off and refrigerant recovery is performed again. When the refrigerant recovery is completed in 90 seconds, the three-way valve 4 is turned on to flow the refrigerant to the refrigerant heating device, and combustion is started to continue the heating operation.

According to this embodiment, even if the compressor is stopped by the room temperature thermistor or OLP during refrigerant recovery work,
Next, the room temperature thermistor and OLP are restored, and when a signal to operate the compressor is received, it becomes possible to immediately restart the compressor.

Effects of the Invention As described above, according to the present invention, even if the room temperature thermistor or overload protection device is activated during refrigerant recovery work, the compressor operation can be resumed quickly when the room temperature thermistor or overload protection device is restored. As a result, heating operation can be resumed immediately, and problems such as flickering of lights etc. due to the starting current of the compressor can be prevented from occurring.

[Brief explanation of the drawing]

Fig. 1 is an electric circuit diagram of an air conditioner showing an embodiment of the present invention, Fig. 2 is a flowchart showing the heating operation of the air conditioner, Fig. 3 is a refrigeration cycle diagram of the air conditioner, and Fig. 4 is a diagram of the refrigeration cycle of the air conditioner.
The figure is a flowchart of a conventional air conditioner. 1... Compressor, 2... Four-way valve, 3... Internal heat exchanger, 4... Two-way valve, 5... Mountain/refrigerant heating device, 1°... ... Two-way valve, 11 ... Overload protection device, 12 ... Control device, 13 ... Room temperature thermistor.

Claims (1)

[Claims] A refrigeration cycle in which a compressor, a four-way valve, an indoor heat exchanger, a two-way valve, and a refrigerant heating device are connected in an annular manner, and a discharge side and a suction side of the compressor are communicated through a two-way valve, and the compressor. The overload protection device comprises a control section equipped with means for detecting the operation of the overload protection device, and a thermistor for detecting indoor temperature, and the overload protection device and A control device for an air conditioner, which stops a compressor and simultaneously opens a two-way valve that communicates the discharge side and the suction side when a room temperature thermistor operates.