JP2000097510A - Refrigerant heating type air conditioner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent or suppress the occurrences of an abnormal temperature rise of refrigerant, and avoid frequent protective operations to take place, which is triggered by such a temperature rise. SOLUTION: An air conditioner 1 realizes a cooling operation in which refrigerant discharged from a compressor 11 is circulated by way of a four-way valve 12, an outdoor side heat exchanger 13, a check valve 19, an indoor side heat exchanger 4, the four-way valve 12, and a check valve 21, and also realizes a heating operation in which the refrigerant is circulated by way of the four-way valve 12, the indoor side heat exchanger 4, a two-way valve 23 and a refrigerant heater 14 which is heated by a gas burner 36. There is provided a thermistor 31 for detecting the pressure of refrigerant. During heating operation, the combustion rate of the gas burner 36 is controlled in accordance with the output of the thermistor 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called refrigerant heating type air conditioner in which a refrigerant is heated by a heating means during a heating operation.

[0002]

2. Description of the Related Art An air conditioner of this type, which is of a refrigerant heating type, is disclosed in, for example, Japanese Patent Application Laid-Open No. 58-6372. That is, in this type of air conditioner, by switching the four-way switching valve, during the cooling operation, the refrigerant discharged from the compressor is cooled by the four-way switching valve, the outdoor heat exchanger, the on-off valve (or the check valve), and the pressure reduction. Return to the compressor through the heat exchanger, indoor heat exchanger, four-way switching valve, check valve, and at the time of heating operation, the refrigerant discharged from the compressor is switched to the four-way switching valve, indoor heat exchanger, and another opening and closing. It was configured to return to the compressor through a refrigerant heater heated by a valve / burner.

[0003] In this type of refrigerant-heated air conditioner, if the temperature of the circulating refrigerant during the heating operation rises abnormally for some reason, the combustion of the burner is stopped, and if the temperature drops again, the combustion is stopped. Is restarting. When the protection operation is performed several times, the compressor is also stopped to end the heating operation, and a predetermined error is displayed.

[0004]

On the other hand, when the heat exchange efficiency of the refrigerant in the indoor heat exchanger is reduced, the temperature of the circulating refrigerant increases, so that the above-mentioned protection operation is frequently performed. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and effectively solves the disadvantage that the protection operation is frequently performed during the heating operation in a refrigerant heating type air conditioner. The purpose is to do so.

[0006]

An air conditioner according to the present invention comprises:
The refrigerant discharged from the compressor is circulated via the flow path switching means, the outdoor heat exchanger, the first check valve, the indoor heat exchanger, the flow path switching means, and the second check valve. A cooling operation and a heating operation of circulating through a refrigerant heater heated by a flow path switching unit, an indoor heat exchanger, an on-off valve, and a heating unit can be performed. Is provided, and the control means is configured to adjust the heating amount of the heating means in accordance with the output of the pressure detection means during the heating operation.

According to the present invention, in a refrigerant heating type air conditioner, a pressure detecting means for detecting a pressure of a refrigerant,
And a control means for controlling the amount of heating of the heating means in accordance with the output of the pressure detection means during the heating operation. By reducing the amount of heating of the means and increasing the amount of heating according to the decrease in pressure, the occurrence of abnormal temperature rise of the refrigerant is prevented or suppressed, and the frequent operation of the protection operation due to such temperature rise is avoided. It is possible to perform a comfortable heating operation and improve the performance of the heating operation.

[0008]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1 is a refrigerant circuit diagram of an air conditioner 1 of the present invention, FIG. 2 is an electric circuit diagram of an indoor unit 2 of the air conditioner 1, and FIG.

In FIG. 1, an air conditioner 1 includes an indoor unit 2 installed in a room to be air-conditioned and an outdoor unit 3 installed outdoors. The indoor unit 2 has a built-in slit fin type indoor heat exchanger 4 and a cross flow fan 6, and the cross flow fan 6 is driven by a fan motor 7. Reference numeral 8 denotes a room temperature sensor for detecting room temperature, and reference numeral 9 denotes a heat exchange temperature sensor for detecting the temperature of the indoor heat exchanger 4.

On the other hand, a compressor 11 as means for circulating refrigerant, a four-way valve 12 as flow switching means,
An outdoor heat exchanger 13, a capillary tube 18, a refrigerant heater 14, a burner section 16, and the like are installed. The equipment in the outdoor unit 3 and the equipment in the indoor unit 2 are connected to refrigerant pipes 17A and 17B for connection. Are connected as shown in FIG.

That is, the discharge side of the compressor 11 is connected to the outdoor heat exchanger 13 via a four-way valve 12 by piping, and the outdoor heat exchanger 13 is connected to the capillary tube 1 as a pressure reducing device.
8, connected to the indoor heat exchanger 4 via the check valve 19 (first check valve) and the refrigerant pipe 17A.

The indoor heat exchanger 4 is connected to a refrigerant pipe 17.
B, a four-way valve 12, a check valve 21 (second check valve), and an accumulator 22, which are connected to the suction side of the compressor 11. The check valve 19 has a forward direction on the indoor heat exchanger 4 side, and the check valve 21 has a forward direction on the accumulator 22 side.

The inlet side of the refrigerant heater 14 is connected to the forward side of the check valve 19 via a two-way valve 23 as an on-off valve, and the outlet side is connected to the forward side of the check valve 21. It is connected. Further, a relief circuit 28 to which an orifice 27 is connected communicates between the refrigerant pipe 17B side of the four-way valve 12 and the forward direction side of the check valve 19.

Reference numeral 26 denotes a thermistor attached to a pipe on the discharge side of the compressor 11, 31 denotes a thermistor (pressure detecting means) attached to a pipe on the refrigerant pipe 17B side of the four-way valve 12, and 32 denotes a refrigerant heater. It is a thermistor attached to the outlet side of the vessel 14. Reference numeral 33 denotes a propeller fan that blows air to the outdoor heat exchanger 13, and is driven by an outdoor fan motor 34.

On the other hand, the burner section 16 is provided with a gas burner 36 as a heating means, a gas supply pipe 35 for supplying gas to the gas burner 36, and a gas supply pipe 35 interposed between the gas supply pipe 35 and supplied to the gas burner 36. Gas proportional valve 37 for adjusting the amount of gas supplied, two gas solenoid valves 38 and 39 and a gas main plug 41 provided for safety in the gas supply pipe 35 between the gas proportional valve 37 and the gas inlet, and the gas A combustion fan 42 for blowing the burner 36 and the combustion fan 42
And a burner motor 43 for driving the motor. The burner may be a kerosene burner.

The refrigerant heater 14 is installed at a position where the refrigerant heater 14 is heated by the gas burner 36. Incidentally, 44
Reference numerals 46 denote a temperature fuse for detecting the temperature of the refrigerant heater 14 and blowing it, and a bimetal switch for opening and closing. Further, the exhaust gas from the gas burner 36 is exhausted from an exhaust port 47.

In the cooling operation, the refrigerant discharged from the compressor 11 flows into the outdoor heat exchanger 13 from the four-way valve 12 as shown by the dashed arrow in the state where the four-way valve 12 is de-energized, where it condenses and liquefies. Then, the pressure in the capillary tube 18 is reduced. Then, it flows into the indoor heat exchanger 4 via the check valve 19 and evaporates there to take heat from the surroundings to exert a cooling effect.

The cool air cooled by the indoor heat exchanger 4 is blown into the room by the cross flow fan 6 to perform cooling. The refrigerant that has exited the indoor heat exchanger 4 enters the accumulator 22 through the check valve 21 together with a part of the refrigerant that has passed through the orifice 27 of the relief circuit 28, where it is separated into gas and liquid, and only the gas refrigerant is compressed. Return to the machine 11.
In this case, the two-way valve 23 is closed.

On the other hand, during the heating operation, the four-way valve 12 is energized and switched, so that the refrigerant discharged from the compressor 11 flows into the indoor heat exchanger 4 as indicated by the solid line arrow in the figure. The refrigerant flowing out of the indoor heat exchanger 4 flows into the refrigerant heater 14 via the open two-way valve 23.

The refrigerant flowing into the refrigerant heater 14 is heated by the gas burner 36 of the burner section 16. The refrigerant flowing out of the refrigerant heater 14 is stored in the accumulator 22.
And returns to the compressor 11. In this manner, the heating refrigerant is circulated through the indoor heat exchanger 4 to exert a heating effect. The warm air heated by the indoor heat exchanger 4 is blown into the room by the cross flow fan 6 to perform heating.

In this heating operation, the refrigerant discharged from the compressor 11 is not depressurized by the capillary tube 18. Therefore, the compressor 11 operates as a refrigerant circulating unit that only circulates the heated gas refrigerant. Therefore,
During the heating operation, the compressor 11 can be simply replaced with a refrigerant circulation pump.

Next, in the electric circuit of the indoor unit 2 shown in FIG. 2, reference numeral 51 denotes an indoor microcomputer composed of a general-purpose microcomputer. The indoor sensor 51 and the heat exchange sensor 9 are connected to the indoor microcomputer 51. Further, a board 52 provided with a setting switch, a display, a receiver from a remote controller, and the like is connected to the indoor microcomputer 51.

A driving circuit 53 is provided in the indoor microcomputer 51.
The flap motor 54 is connected via the. The flap motor 54 drives a flap (not shown) for adjusting the wind direction attached to the indoor unit 2. Furthermore,
The fan microcomputer 7 is connected to the indoor microcomputer 51 via a phase control circuit 56. Incidentally, 57 is a condenser for the fan motor. Therefore, the rotation speed of the fan motor 7 is controlled by the phase control circuit 56.

The power supplied from the outlet 58 through the power switch 59 is supplied through the filter 61, the step-down transformer 62, and the DC constant voltage power supplies 63 and 64.

One of the power switches 59 is connected to the first terminal of the terminal plate, and the other is directly connected to the third terminal of the terminal plate. Further, the other end of the power switch 59 is connected to the second terminal of the terminal plate via a power relay 66 and to the fourth terminal of the terminal plate via a switch 67 for a four-way valve.

On the other hand, in the electric circuit of the outdoor unit 3 in FIG. 3, reference numeral 68 denotes a motor for driving the compressor 11, which is connected between the first and second terminals of the terminal board via the overload relay 69 and the power relay 66. It is connected to the. Also,
The fan motor 34 is connected between a first terminal and a second terminal of the terminal plate via a relay contact 71. And
An operation signal detection circuit 72 is further connected between the first and second terminals of the terminal board, and the output of the operation signal detection circuit 72 is output from an outdoor unit microcomputer 73 comprising a general-purpose microcomputer.
Has been entered.

The four-way valve 12 is connected between the first and fourth terminals of the terminal plate. A cooling / heating signal detection circuit 76 is further connected between the first and fourth terminals of the terminal board,
The output of the cooling / heating signal detection circuit 76 is also supplied to the outdoor unit microcomputer 73.
Has been entered.

A two-way valve 23 and a relay contact 78 are provided between a first terminal and a third terminal of the terminal plate via a filter 77.
, A series circuit of a burner motor 43 and a triac (bidirectional three-terminal thyristor) 79, a series circuit of an igniter 82 of the gas burner 36 and a relay contact 83, and a series circuit of a relay contact 84 and a full-wave rectifier circuit 86. Are connected in parallel.

The phase control circuit 94 connected to the outdoor unit microcomputer 73 is connected to the gate of the triac 79. Further, the gas electromagnetic valves 39 and 38 are connected in parallel to the output of the full-wave rectifier circuit 86, and a relay contact 87 is connected to the gas electromagnetic valve 38 in series.

The outdoor unit microcomputer 73 is connected to each of the thermistors 26, 31, and 32, and also connected to a display circuit 88 having an LED for displaying an error or the like.
The outdoor unit microcomputer 73 is connected to the gas proportional valve 37 via a proportional valve drive circuit 89, and includes a coil C for opening and closing the relay contacts 87, 84, 83, 78 and 71. The relay drive circuit 93 is also connected.

The outdoor unit microcomputer 73 is connected to a memory 91 composed of a readable and writable EEPROM storing data for gas switching, and also connected to a memory 92 composed of an EEPROM storing other data. I have. Note that the memory 92 may also be used as the memory 91. Further, a frame sensor circuit 97 having a frame rod 96 for detecting the flame of the gas burner 36 is connected to the outdoor unit microcomputer 73.

The power supplied to the coil C via the filter 77 is supplied via the power transformer 98, the DC constant voltage power supply 99, the temperature fuse 44 and the bimetal switch 46. Further, the DC constant voltage power supply 101 connected to the secondary side of the power transformer 98 serves as a power supply for the outdoor unit microcomputer 73 and the power transformer 9.
The secondary side of 8 also feeds the frame sensor circuit 97.

The first and second terminals of the terminal boards of the indoor unit 2 and the outdoor unit 3 are the second and third terminals, the third and third terminals, and the fourth and fourth terminals. The terminals are respectively arranged and connected by internal / external connection lines 102 (FIG. 1).

The operation of the air conditioner 1 with the above configuration will be described. The power switch 59 is assumed to be closed, and when a cooling operation is instructed by the user on the board 52, the indoor microcomputer 51 opens the switch 67. Thereby, the four-way valve 1
2 is de-energized. Further, since no voltage appears in the cooling / heating signal detecting circuit 76, the outdoor unit microcomputer 73
Recognizes the cooling operation, opens the relay contact 78, and closes the two-way valve 23. Thereby, the flow of the refrigerant becomes the flow at the time of the cooling operation described above.

In this state, based on the output of the room temperature sensor 8, the indoor microcomputer 51 closes the power relays 66, 66 and starts the compressor 11 when the room temperature is higher than the set temperature (O).
N), and the cross flow fan 6 is operated to cool the room as described above. If the room temperature falls below the set temperature by the cooling operation, the indoor microcomputer 51 opens the power relays 66 and 66 to stop the compressor 11 (OFF) based on the output of the room temperature sensor 8. This ON / OFF
Is provided with a temperature differential or a time differential to prevent ON / OFF chattering.

Since a voltage also appears in the operation signal detection circuit 72 when the compressor 11 is started, the outdoor unit microcomputer 73 closes the relay contact 71 and operates the outdoor fan motor 34 based on the output. Further, when the compressor 11 stops, no voltage appears in the operation signal detection circuit 72. Therefore, the outdoor unit microcomputer 73 stops the outdoor fan mold 34 based on the output change.

When the room temperature rises again to the set temperature (there is a safe time of three minutes), the indoor microcomputer 51 closes the power relays 66 and 66 again and starts the compressor 11. The room is cooled to the set temperature by the cooling operation.

Next, the operation when the heating operation is instructed by the user will be described with reference to the flowchart of FIG. In this heating operation, the indoor microcomputer 51 closes the switch 67, so that the four-way valve 12 is energized (step S1). Thereby, the flow of the refrigerant becomes the flow at the time of the heating operation described above. Further, since a voltage appears in the cooling / heating signal detection circuit 76, the outdoor unit microcomputer 73 recognizes the heating operation based on the output change, but the relay contact 78 is continuously opened and the two-way valve 23 is closed (step S2).

On the other hand, the indoor microcomputer 51 closes the power relays 66, 66 to start (ON) the compressor 11. As a result, the refrigerant accumulated in the outdoor heat exchanger 13 passes through the check valve 21 and the accumulator 22,
Is collected on the suction side. That is, the outdoor unit microcomputer 73 executes the refrigerant recovery operation before starting the heating. When the time t2 has elapsed from the start of operation (step S3), the outdoor unit microcomputer 73 opens the two-way valve 23 (step S3).
4) It is determined whether the temperature TP detected by the thermistor 31 is lower than a predetermined cold start temperature T1 (Step S5).

Then, the pressure of the refrigerant is low and the temperature TP <T
In the case of 1, the gas burner 36 is burned at a limited combustion amount described later (step S6). That is, when the compressor 11 is started as described above, a voltage also appears in the operation signal detection circuit 72. Based on the output change, the outdoor unit microcomputer 73 operates each relay contact to operate the gas solenoid valve 38,
At the same time as opening 39, the gas proportional valve 37 is opened to supply gas to the gas burner 36. In addition, the igniter 82 is energized to ignite the gas burner 36 (operation: ON), and the combustion fan 42 is operated by the burner motor 43 to blow air to the gas burner 36.

At this time, the amount of combustion in the gas burner 36 can be changed by adjusting the opening of the gas proportional valve 37 and the rotation speed of the burner motor 43 under the control of the outdoor unit microcomputer 73. In this case, the outdoor unit Microcomputer 73
Is operated with the combustion amount limited to, for example, 61% as described above (step S6).

Next, when a time t1 (for example, one minute or the like, where t2 <t1) has elapsed from the start of the operation (step S7).
Then, it is determined whether the temperature TP has become higher than the temperature T2 higher than the temperature T1 (step S8). That is, after the time t2 has elapsed from the start of the operation, at least the restricted combustion is continued until t1. At the same time, the outdoor unit microcomputer 73
Reset the counter as a function of.

Then, the pressure of the refrigerant does not rise and the temperature TP
In the case of <T2, the outdoor unit microcomputer 73 sets the gas proportional valve 37
By adjusting the opening degree and the rotation speed of the burner motor 43,
The combustion amount of the gas burner 36 is set to a minimum combustion of, for example, 43% to 44% (step S9).

When the refrigerant pressure rises in the process of continuing the minimum combustion, the temperature TP rises, and the temperature TP rises to the temperature T2 or higher. Higher limit combustion release temperature T
It is determined whether or not it has reached 3 or more (step S10). If it has not risen to that level, the amount of combustion of the gas burner 36 is controlled by the opening of the gas proportional valve 37 and the rotation speed of the burner motor 43 to limit combustion. (Step S1
2).

In the process of continuing the restricted combustion, the refrigerant pressure rises, the temperature TP rises, and the temperature TP rises to the temperature T3.
When the temperature rises above, the outdoor unit microcomputer 73 sets the gas proportional valve 3
7 and the number of revolutions of the burner motor 43 are adjusted to release the restriction of the combustion amount of the gas burner 36 to 100
% Combustion (step S11).

As described above, the pressure of the refrigerant is determined based on the detection value of the thermistor 31, and when the heating operation is started, if the temperature TP is lower than T1 and the pressure of the refrigerant is low, the combustion amount of the gas burner 36 is limited. At the same time, after the elapse of the time t1, the pressure of the refrigerant does not rise above a predetermined value, and
If not more than 2, the combustion amount of the gas burner 36 is reduced to the minimum value, so that it is possible to prevent the inconvenience of performing the protection operation described below due to the temperature of the refrigerant excessively increasing at the start of the heating operation. become.

Thereafter, normal heating control is performed. That is, based on the output of the room temperature sensor 8, the indoor microcomputer 51 closes the power relays 66 and 66 to start (ON) the compressor 11 when the room temperature is lower than the set temperature (that is, the lower limit temperature: for example, + 22 ° C.). , The cross flow fan 6 is operated. When the compressor 11 is started, the operation signal detection circuit 72
Voltage, the outdoor unit microcomputer 73 operates each relay contact based on the output change to operate the gas solenoid valve 38,
At the same time as opening 39, the gas proportional valve 37 is opened to supply gas to the gas burner 36. In addition, the igniter 82 is energized to ignite the gas burner 36 (operation: ON), and the combustion fan 42 is operated by the burner motor 43 to blow air to the gas burner 36.

As described above, the amount of combustion in the gas burner 36 is controlled by the microcomputer 73 of the outdoor unit.
Although it can be changed by adjusting the opening degree of 7 and the rotation speed of the burner motor 43, it is usually operated with 100% combustion amount.

The refrigerant heater 14 is heated as described above, and the room is heated as described above. By this heating operation, the room temperature is the upper limit temperature of the set temperature + 1 ° C (+ 23 ° C).
The microcomputer 51 opens the power relays 66, 66 based on the output of the room temperature sensor 8 and
Is stopped (OFF). Since the stop of the compressor 11 causes no voltage to appear in the operation signal detection circuit 72, the output unit microcomputer 73 causes the outdoor unit microcomputer 73 to operate the gas solenoid valves 3
8, 39 are closed, and the gas burner 36 is extinguished (a state of pilot flame) (combustion stop: OFF).

When the room temperature falls again to the set temperature (there is a safe time of three minutes), the indoor microcomputer 51 closes the power relays 66 and 66 again and starts the compressor 11. Then, the outdoor unit microcomputer 73 ignites the gas burner 36 as described above based on the activation of the compressor 11.
The room is heated to around the set temperature by such a heating operation.

The outdoor unit microcomputer 73 is connected to the thermistor 32.
If the detected temperature TP is, for example, + 55 ° C. or more, the gas proportional valve 37 and the burner motor 43 are adjusted to reduce the amount of combustion of the gas burner 36, thereby reducing the temperature of the refrigerant to + 55 ° C. To maintain.

During the heating operation, the indoor heat exchanger 4
For example, when the heat exchange efficiency of the refrigerant is low, the pressure of the refrigerant increases. When the temperature TP detected by the thermistor 31 becomes higher than the predetermined limit combustion start temperature T4 due to the pressure increase (step S13 in FIG. 5), the outdoor unit microcomputer 73 adjusts the gas proportional valve 37 and the burner motor 43 to adjust the gas burner. The combustion amount of 36 is set to the above-described limited combustion (step S14).

After the time t3 has been continued (step S15), if the temperature TP has not become lower than T4, the outdoor unit microcomputer 73 adjusts the gas proportional valve 37 and the burner motor 43. Gas burner 3
6 is set to the aforementioned minimum combustion (step S1).
7).

The temperature TP decreases due to the decrease in the combustion amount, and when the temperature TP becomes lower than the temperature T4, it is determined whether or not the temperature TP has become lower than the limit combustion release temperature T5 (T5 <T4). In the case, the outdoor unit microcomputer 7
3 adjusts the gas proportional valve 37 and the burner motor 43 to limit the combustion amount of the gas burner 36 to the limited combustion (step S19).

When the temperature TP becomes lower than the temperature T5, the outdoor unit microcomputer 73 adjusts the gas proportional valve 37 and the burner motor 43 to release the restriction on the combustion amount of the gas burner 36 (step S20).

The temperature of the refrigerant rises (the pressure also rises) due to the combustion control, and the temperature detected by the thermistor 32 is abnormally high, such as + 80 ° C. (set to any one of + 80 ° C. to + 90 ° C.). When the temperature has reached, the outdoor unit microcomputer 73 forcibly extinguishes (OFF) the gas burner 36. The temperature detected by the thermistor 32 is, for example, + 50 ° C.
For example, a protection operation for waiting for the temperature to drop is performed.

When the temperature detected by the thermistor 32 falls below the abnormally high temperature due to the extinguishing of the gas burner 36, the outdoor unit microcomputer 73 opens the relay contact 78 and closes the two-way valve 23. Thereby, the outdoor heat exchanger 13
The refrigerant that has leaked and accumulated in the inside is collected through the check valve 21 and the accumulator 22 to the suction side of the compressor 11.
That is, the same refrigerant recovery operation as described above is performed. After executing the refrigerant recovery operation for the time t1, the two-way valve 23
Is opened, and the refrigerant flows to the refrigerant heater 14 to return to the above-described heating control.

Here, when such an abnormal situation occurs three times, the outdoor unit microcomputer 73 displays an error on the display circuit 88 and stops the operation of the air conditioner 1. However,
As described above, the outdoor unit microcomputer 73 determines the increase in the refrigerant pressure based on the detection value of the thermistor 31, and when the pressure increases, the combustion amount of the gas burner 36 is reduced to the limited combustion and the minimum combustion. Such frequent operation of the protection operation due to the temperature rise can be avoided. As a result, it is possible to extend the period leading to the error stop or to continue the heating operation without error stop to improve the comfort and performance.

The error stop is cleared by turning on the power switch 59 again. It is also assumed that the counter for counting the number of times of the abnormal situation is reset at the start of the heating operation.

[0060]

As described in detail above, according to the present invention, a refrigerant heating type air conditioner is provided with a pressure detecting means for detecting the pressure of the refrigerant and a control means. In the meantime, since the heating amount of the heating means is adjusted according to the output of the pressure detecting means, when the pressure of the refrigerant is high as in claim 2, the heating amount of the heating means is reduced and the pressure is reduced. By increasing the heating amount accordingly, it is possible to prevent or suppress the occurrence of the abnormal temperature rise of the refrigerant, and to prevent the frequent operation of the protection operation due to the temperature rise beforehand. It will be possible to improve the ability.

[Brief description of the drawings]

FIG. 1 is a refrigerant circuit diagram of an air conditioner of the present invention.

FIG. 2 is an electric circuit diagram of the indoor unit of the air conditioner of the present invention.

FIG. 3 is an electric circuit diagram of the outdoor unit of the air conditioner of the present invention.

FIG. 4 is a flowchart showing an operation at the start of a heating operation.

FIG. 5 is a flowchart showing an operation during a heating operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Air conditioner 2 Indoor unit 3 Outdoor unit 4 Indoor heat exchanger 11 Compressor 12 Four-way valve (flow path switching means) 13 Outdoor heat exchanger 14 Refrigerant heater 16 Burner part 23 Two-way valve (open / close valve) 31 Thermistor (pressure detecting means) 36 Gas burner (heating means) 51 Indoor microcomputer 73 Outdoor unit microcomputer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hiroshi Okumura 1-1, Ohitohimachi, Moriguchi-shi, Osaka Sanyo Electric Gas Equipment Co., Ltd. (72) Tomohisa Haneda 1-1, Ohitohicho, Moriguchi-shi, Osaka No. Sanyo Electric Gas Equipment Co., Ltd. (72) Inventor Kazuya Sugiyama 1-1, Ohito-cho, Moriguchi-shi, Osaka Prefecture In-house Sanyo Electric Gas Equipment Co., Ltd. (72) Haruo Horii, No. 1, Dainitsu-cho, Moriguchi-shi, Osaka No. 1 Sanyo Electric Gas Equipment Co., Ltd. F-term (reference) 3L092 MA01 NA13 PA11

Claims (2)

[Claims] 1. A refrigerant discharged from a compressor is supplied to a passage switching means, an outdoor heat exchanger, a first check valve, an indoor heat exchanger, the passage switching means, and a second check valve. And a heating operation to circulate through a refrigerant heater heated by the flow path switching means, the indoor heat exchanger, the on-off valve, and the heating means. In the air conditioner, the air conditioner includes a pressure detection unit for detecting a pressure of the refrigerant, and a control unit. The control unit controls a heating amount of the heating unit according to an output of the pressure detection unit during the heating operation. A refrigerant heating type air conditioner characterized by adjustment. 2. The refrigerant heating system according to claim 1, wherein the control means decreases the heating amount of the heating means when the pressure of the refrigerant is high, and increases the heating amount in accordance with the decrease in the pressure. Air conditioner.