JP2815314B2 - Refrigerant heating type air conditioner - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling / heating apparatus for heating a refrigerant during a heating operation.

[0002]

2. Description of the Related Art In a refrigerant heating / cooling apparatus (see FIGS. 1 and 2), a refrigerant passage of a four-way valve differs between a cooling operation (cooling cycle) and a heating operation (heating cycle). [Cooling operation] When the compressor 1 is operated, the refrigerant flows from the compressor 1 → the four-way valve 2 → the outdoor heat exchanger 3 → the first check valve 4 → the capillary tube 5 (decompressor) → the indoor heat exchanger 6 → Four-way valve 2
The second check valve 7 → the accumulator 8 → the compressor 1 is circulated (cooling cycle) in this order to cool the indoor air in which the indoor heat exchanger 6 is arranged.

[Heating operation] Refrigerant heater 10 and compressor 1
Is operated and the four-way valve 2 is energized and switched, the refrigerant is
Compressor 1 → four-way valve 2 → indoor heat exchanger 6 → two-way valve 2 → refrigerant heater 10 → accumulator 8 → compressor 1 circulating in order (heating cycle) and indoor air in which indoor heat exchanger 6 is arranged Heat.

A pipe from the four-way valve 2 to the first check valve 4 via the outdoor heat exchanger 3 is used in a cooling cycle.
Since the refrigerant is not used in the heating cycle, it is necessary to recover the refrigerant remaining in the pipe to the heating cycle when performing the heating operation. If the refrigerant is not recovered or the recovery rate is low, the amount of the refrigerant circulating in the heating cycle during the heating operation becomes insufficient, and the refrigerant heater 10 abnormally overheats or the heating capacity is reduced. .

[0005] For this reason, in the conventional refrigerant heating / cooling system, the two-way valve 9 is closed, the four-way valve 2 is energized and switched, and the refrigerant recovery operation is performed by operating the compressor 1 for a predetermined time. . By this refrigerant recovery operation, the first check valve 4
Heat exchanger 3, four-way valve 2, second check valve 7 from upstream side
The refrigerant in the pipeline leading to the upstream side can be recovered during the heating cycle.

It is to be noted that, as the outside air temperature is lower, the efficiency of the compressor 1 is lower and the evaporation rate of the refrigerant is lower. -
196456).

[0007]

However, the following problems occur when the refrigerant recovery operation is performed by the conventional technique. To increase the refrigerant recovery rate, it is necessary to operate the compressor 1 at a low pressure for a long time to continue the refrigerant recovery operation.
However, as the time elapses, the inside of the compressor approaches an almost vacuum,
The sliding part of the compressor 1 loses lubricity, which causes deterioration of the compressor 1 (for example, a shortened life). For this reason, the above-mentioned predetermined time is set short so that the compressor 1 does not deteriorate, and has a characteristic that the refrigerant recovery rate is poor.

[0008] It is an object of the present invention to provide a refrigerant heating type cooling / heating apparatus which has a good refrigerant recovery rate and prevents deterioration of the compressor.

[0009]

In order to solve the above-mentioned problems,
The present invention employs the following configuration. (1) Compressor, four-way valve, outdoor heat exchanger,
A first check valve, a decompressor, an indoor heat exchanger, the four-way valve, a second check valve, a cooling cycle in which the compressor is circularly connected in order and the refrigerant is circulated, and during the heating operation, the compressor is used. A heating cycle in which the four-way valve, the indoor heat exchanger, the two-way valve, the refrigerant heater, and the compressor are circularly connected in order and the refrigerant is circulated, and when the heating operation is performed, the heating operation is started. Before connecting the outdoor heat exchanger, the four-way valve, the second check valve, the compressor, the four-way valve, the indoor heat exchanger in order, and operating the compressor, the first A refrigerant recovery operation for moving refrigerant in a pipe from an upstream side of a check valve to an upstream side of the second check valve to a discharge side of the compressor; and a compressor, the four-way valve, and the indoor heat exchange. Device, the two-way valve, the refrigerant heater, and the compressor are sequentially annularly connected. To, implement the preparation operation for performing a lubricating operation for operating the compressor alternately.

(2) Having the configuration of (1) above, the number of times of the preparatory operation is determined based on the outside air temperature or the temperature of a portion related to the outside air temperature.

(3) Having the configuration of the above (1), the number of times of the preparatory operation is set to a predetermined number or determined based on the outside temperature or the temperature of a portion related to the outside temperature. ,
After completion of the final refrigerant recovery operation, the operation shifts to the heating operation without performing the lubrication operation.

(4) In the configuration of (1), (2) or (3) above, when the preparatory operation is performed twice or more, the recovery operation time is shortened as the refrigerant recovery operation is performed later.

(5) The above (1) or (2) or (3) or (4)
The refrigerant heater is operated during the lubrication operation.

(6) The above (1) or (2) or (3) or (4)
Or, it has the configuration of (5), and operates the refrigerant heater during the final refrigerant recovery operation.

[0015]

[Action and effect of the invention]

[Claim 1] When performing the heating operation, when the heating operation is performed in a state where the refrigerant remains in the pipeline from the upstream side of the first check valve to the upstream side of the second check valve, Problems such as abnormal overheating of the evaporator occur.

For this reason, it is necessary to move the refrigerant during the heating cycle on the outlet side of the compressor, and the following preparation operation is performed. By the preparatory operation including the refrigerant recovery operation and the lubrication operation, the refrigerant recovery rate is improved, and the deterioration of the compressor can be prevented.

An outdoor heat exchanger, a four-way valve, a second check valve, a compressor, a four-way valve, and an indoor heat exchanger are connected in this order, and a refrigerant recovery operation for operating the compressor is performed. The refrigerant remaining in the pipeline from the upstream side of the first check valve to the upstream side of the second check valve moves to the outlet side of the compressor.

When the refrigerant recovery operation is continued, the compressor approaches a substantially vacuum state, and the lubricating property of the sliding portion of the compressor decreases, so that the compressor, the four-way valve, the indoor heat exchanger, the two-way valve, The refrigerant heater and the compressor are sequentially connected in a loop, and a lubrication operation for operating the compressor is performed.

When the lubrication operation is performed, the refrigerant circulates along the same route as the heating cycle and passes through the inside of the compressor, so that the lubricating property returns to the sliding portion of the compressor. During the lubrication operation, the flow path resistance of the heating cycle is significantly reduced, so that the refrigerant is not recovered, and the refrigerant is not flown into the outdoor heat exchanger due to the provision of the second check valve.

After completion of the lubrication operation, a similar refrigerant recovery operation is performed. At this time, while the recovery of the refrigerant in the pipeline from the upstream side of the first check valve to the upstream side of the second check valve proceeds, the refrigerant flows from the two-way valve outlet to the suction side of the compressor via the refrigerant heater. The sliding part of the compressor is lubricated by the refrigerant in the pipeline.

[Claim 2] As the outside air temperature is lower,
Since the rise of the compressor is poor and the evaporation rate of the refrigerant is low, the recovery rate of the refrigerant is low. However, the lower the temperature of the outside air temperature or a portion related to the outside air temperature is, the more the number of times of the preparation operation is increased, so that the refrigerant recovery rate can be increased.

Also, the higher the outside air temperature, the better the compressor rises and the higher the evaporation rate of the refrigerant, so that the recovery rate of the refrigerant is improved. Since the number of times of the preparation operation is reduced as the outside air temperature or the temperature related to the outside air temperature increases, unnecessary recovery operation time can be omitted, and the operation can be shifted to the heating operation at an early stage.

[Claim 3] After the final refrigerant recovery operation is completed, there is no problem even if the operation is directly shifted to the heating operation. As a result, it is possible to shift to the heating operation as soon as possible without unnecessary lubrication operation.

[Claim 4] The residual refrigerant in the pipeline from the upstream side of the first check valve to the upstream side of the second check valve becomes smaller (low pressure) in the later refrigerant recovery operation. . Because of this,
By shortening the recovery operation time for the later refrigerant recovery operation, the load on the compressor can be reduced, and deterioration of the compressor can be prevented.

[Claim 5] When the refrigerant heater is operated during the lubrication operation, the temperature of the circulating refrigerant increases, the refrigerant circulation amount increases, and the pressure of the refrigerant increases. For this reason, in the refrigerant recovery operation to be performed next, the compressor operates with high efficiency, so that the refrigerant recovery rate can be increased.

[Claim 6] When the refrigerant heater is operated during the final refrigerant recovery operation, the temperature of the refrigerant heater and the refrigerant at the entrance and exit of the refrigerant heater rise. Therefore, when shifting to the heating operation, the heating operation can be quickly started by the preheating.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention (corresponding to claims 1 to 6) will be described with reference to FIGS. The refrigerant heating type gas cooling and heating apparatus A employing the configuration of the present invention is configured by connecting the respective functional members with piping as shown in the figure, and the compressor 1 → the four-way valve 2 → the outdoor heat exchanger 3 → Refrigerant (Freon R22) in the order of first check valve 4 → capillary tube 5 → indoor heat exchanger 6 → four-way valve 2 → second check valve 7 → accumulator 8 → compressor 1
To perform a cooling operation by circulating (cooling cycle), and circulate the refrigerant in the order of compressor 1 → four-way valve 2 → indoor heat exchanger 6 → two-way valve 9 → refrigerant heater 10 → accumulator 8 → compressor 1. Heating operation is performed in cycle (1).

Reference numeral 61 denotes an indoor fan that blows air to the indoor heat exchanger 6, 31 denotes an outdoor fan that blows air to the outdoor heat exchanger 3,
11 is a check valve. Reference numeral 12 denotes "closed" during the cooling operation, and during the stop of the compressor 1 and the low pressure 17 during the heating operation.
A two-way valve that opens when the pressure is equal to or more than kgcm ² G, 13 is a gas burner, 14 is a proportional solenoid valve, 15 is a pressure switch, and 16 is a combustion fan.

Further, the gas heating / cooling apparatus A of the refrigerant heating type comprises:
Temperature setting device 17 for setting the target room temperature, room temperature sensor 18 for detecting the room temperature, and temperature sensor 1 for detecting the temperature of the refrigerant
9, the calculation of the heat radiation amount, the control of the indoor fan 61, the control of the combustion fan 16, the control of the proportional solenoid valve 14, the cooling cycle,
And a controller 20 having a microcomputer for controlling a heating cycle, a refrigerant recovery operation, a lubrication operation, and the like.

The compressor 1 is a rotary type having sliding blades, is driven by an AC motor (power consumption: about several hundred W to several kW) supplied with AC-100V, and receives gas from the accumulator 8. The refrigerant is adiabatically compressed. still,
The compressor 1 may be a scroll type or a reciprocating type.

The four-way valve 2 is an electromagnetic valve for switching the circulation path of the refrigerant, and is energized during the cooling operation to form a flow path as shown by the arrow in FIG. Is formed as shown by the arrow in FIG.

The indoor heat exchanger 6 is a meandering pipe having fins and the like blown by the indoor fan 61, is disposed in an indoor unit (not shown) installed indoors, and is connected to the outdoor by a refrigerant pipe. Is connected to an outdoor unit (not shown) installed in the air conditioner. The flow direction of the refrigerant is opposite between the cooling operation (in the direction of the arrow in FIG. 1) and the heating operation (in the direction of the arrow in FIG. 2).

The accumulator 8 has a straight tubular refrigerant gas inlet pipe and a substantially U-shaped refrigerant gas outlet pipe having an opening at the top, which are arranged in an airtight container. The compressor 1 is disposed on the suction side of the compressor 1 in order to prevent intrusion of the air. The two-way valve 9 is an electromagnetic valve that opens during the heating operation and closes during the cooling operation, and is arranged so that the refrigerant does not flow into the refrigerant heater 10 during the cooling operation.

The refrigerant heater 10 is a heat absorbing tube arranged in a meandering shape, is disposed in an outdoor unit (not shown) installed outdoors, and is heated by combustion gas generated by combustion of the gas burner 13. Gas burner 13 (3000 kcal / h
In the case of (10000 kcal / h), the gas whose gas amount is set by the proportional solenoid valve 14 and the combustion air supplied by the combustion fan 16 are mixed and forcedly burned.

The temperature sensor 19 is disposed in a conduit 101 from the refrigerant heater 10 to the accumulator 8 where the refrigerant is always in a superheated vapor state, and detects the temperature of the refrigerant related to the outside air temperature.

Next, the operation of the controller 20 in the preparatory operation will be described with reference to FIGS. 4 (showing the flow of the refrigerant during the refrigerant recovery operation), FIG. 5 (showing the flow of the refrigerant during the lubrication operation), and FIGS.
A description will be given based on (a flowchart showing the operation of the preparation operation).

When the start of the heating operation (described later) is instructed by turning on the operation switch SW or the like, at step s1,
It is determined whether or not the cooling operation (described later) was performed last time (the previous operation type is stored in the E ² PROM or the like). If the cooling operation was performed last time (YES), the process proceeds to step s2. If the cooling operation has not been performed last time (NO), the process proceeds to step s23.

In step s2, the temperature t of the refrigerant is detected based on the output from the temperature sensor 19, and the flow advances to step s3. At Step s3, the compressor 1 is set in the operating state, and the process proceeds to Step s4. In step s4, it is determined whether or not t ≧ 3 ° C. If t ≧ 3 ° C. (YES), the process proceeds to step s5, and if t <3 ° C. (NO), the process proceeds to step s6.

In step s5, a variable C (the number of times the refrigerant recovery operation is performed) is set to 1, and the flow advances to step s11.
At step s6, it is determined whether or not t ≧ −3 ° C.
If the temperature is −3 ° C. (YES), the process proceeds to step s7 and t
If it is <−3 ° C. (NO), the process proceeds to step s8.

In step s7, the variable C is set to 2, and the flow advances to step s11. In step s8, it is determined whether or not t ≧ −13 ° C., and if t ≧ −13 ° C. (YES)
Proceeds to step s9, and if t <−13 ° C. (N
O) proceeds to step s10.

In step s9, the variable C is set to 3, and the flow advances to step s11. In step s10, the variable C is set to 4, and the process proceeds to step s11. In step s11, the variable N (the number of times of performing the refrigerant recovery operation) is set to 1, and
Proceed to 12.

In step s12, a refrigerant recovery operation to be described later is started, and at the same time, a timer T (refrigerant recovery operation time) is started, and the flow advances to step s13. Step s13
Then, it is determined whether or not this refrigerant recovery operation is the last one,
If the variable C = 1 (YES), proceed to step s14,
If C ≠ 1 (NO), the flow proceeds to step s15.

In step s14, the combustion of the gas burner 13 is started, and the flow advances to step s15. In step s15, a timer T (refrigerant recovery operation time) is determined so that the refrigerant recovery operation time becomes shorter as the refrigerant recovery operation becomes later.
Proceed to 16. Note that the refrigerant recovery operation time is set to a short time such that the compressor 1 does not deteriorate. In step s16, it is determined whether or not the time of the timer T has expired (the determined time has elapsed). If the time has expired (YES), the flow proceeds to step s17.

In step s17, the current refrigerant recovery operation is ended, and the number of times of performing the refrigerant recovery operation is reduced by one (C = C-1), and the process proceeds to step s18. In step s18, it is determined whether or not the number of executions of the refrigerant recovery operation has become zero. If C = 0 (YES), step s2
The process proceeds to step S3, and if C> 0 (NO), the process proceeds to step s19.

In step s19, a 15-second timer is started, and the flow advances to step s20. In step s20, a lubrication operation described later is started, and the process proceeds to step s21. This lubrication operation is performed by opening the two-way valve 9 and starting combustion of the gas burner 13.

In step s21, it is determined whether or not the 15-second timer has expired. If the time has expired (YES), the flow advances to step s22. Step s22
Then, the current lubrication operation is ended, and the number of times of performing the refrigerant recovery operation is increased by one (N = N + 1), and the step s
Return to 12.

[Cooling operation] In the cooling operation, the controller 20
1, the four-way valve 2 is in the position shown in FIG. 1, the two-way valve 9 is in the closed state, the gas burner 13 is in the extinguished state, the compressor 1 is in the intermittent or continuous operating state, the indoor fan 61 is in the operating state,
Put 1 in an intermittent or continuous operating state.

For this reason, the refrigerant flows from the compressor 1 → the four-way valve 2 → the outdoor heat exchanger 3 → the first check valve 4 → the capillary tube 5 →
The indoor heat exchanger 6 → the four-way valve 2 → the second check valve 7 → the accumulator 8 → the compressor 1 is circulated (cooling cycle) in this order to cool the indoor air in which the indoor heat exchanger 6 is arranged.

[Heating Operation] In the heating operation, the controller 20
, The four-way valve 2 is in the position shown in FIG. 2, the two-way valve 9 is in the open state, the gas burner 13 is in the intermittent or continuous combustion state, the compressor 1
In the intermittent or continuous operation state and the indoor fan 61 in the operation state.

For this reason, the refrigerant circulates in the order of compressor 1 → four-way valve 2 → indoor heat exchanger 6 → two-way valve 9 → refrigerant heater 10 → accumulator 8 → compressor 1 (heating cycle) to generate indoor heat. The air in the room where the exchanger 6 is arranged is heated.

[Refrigerant recovery operation] When the cooling operation is performed last time and the heating operation is performed this time, the flow path from the upstream side of the first check valve 4 to the upstream side of the second check valve 7 The refrigerant remains in the outdoor heat exchanger 3, the pipe 32, and the pipe 71 '.

Therefore, the controller 20 sets the four-way valve 2 to the position shown in FIG. 4, closes the two-way valve 9 and extinguishes the gas burner 13 (intermittent or continuous combustion in the final refrigerant recovery operation). Then, the compressor 1 is continuously operated, the indoor fan 61 is stopped, and the outdoor fan 31 is stopped.

For this reason, the flow path (the pipe 41, the outdoor heat exchanger 3, the pipe 32, and the pipe 71) extending from the upstream side of the first check valve 4 to the upstream side of the second check valve 7 is provided. The remaining refrigerant moves to the outlet side of the compressor 1. The refrigerant recovery operation is continued for about 25 seconds to 45 seconds. However, the inside of the flow path and the inside of the compressor 1 gradually approaches a substantially vacuum, and the lubricating property of the sliding portion of the compressor 1 decreases. .

[Lubrication operation] Then, the controller 20 sets the four-way valve 2 to the position shown in FIG. 5, the two-way valve 9 is opened, the gas burner 13 is continuously burned, the compressor 1 is continuously operated,
The indoor fan 61 is stopped (15 seconds in this embodiment).

For this reason, the refrigerant circulates through the compressor 1 in order of the compressor 1, the four-way valve 2, the indoor heat exchanger 6, the two-way valve 9, the refrigerant heater 10, the accumulator 8, and the compressor 1. Therefore, the lubricating property returns to the sliding portion of the compressor 1. During the lubrication operation, the flow path resistance of the heating cycle becomes extremely small, so that the refrigerant is not recovered, and the refrigerant does not flow into the outdoor heat exchanger 3 due to the provision of the second check valve 7.

After the lubrication operation is completed, the same refrigerant recovery operation as described above is performed. At this time, the recovery of the refrigerant in the pipe from the upstream side of the first check valve 4 to the upstream side of the second check valve 7 proceeds, and the compressor passes through the refrigerant heater 10 from the outlet of the two-way valve 9. The sliding portion of the compressor 1 is lubricated by the refrigerant in the pipeline reaching the suction side of the compressor 1.

Next, the advantages of the gas heating / cooling apparatus A of the present embodiment, which is of the refrigerant heating type, will be described. [A] When the refrigerant recovery operation shown in FIG. 4 is performed, the refrigerant remaining in the pipeline from the upstream side of the first check valve 4 to the upstream side of the second check valve 7 gradually discharges from the compressor 1. , The slidability of the sliding portion of the compressor 1 gradually decreases. However, by performing the lubrication operation shown in FIG. 5 for 15 seconds, the lubricity of the sliding portion of the compressor 1 is restored. By performing the refrigerant recovery operation after the lubrication operation, it is possible to further recover the residual refrigerant in the pipe while maintaining the lubricity of the sliding portion of the compressor 1.

Therefore, almost all of the refrigerant in the pipeline from the upstream side of the first check valve 4 to the upstream side of the second check valve 7 can be removed without causing deterioration of the compressor 1. Can be collected on the discharge side.

[A] As the outside air temperature is lower, the rise of the compressor 1 is worse and the evaporation rate of the refrigerant is lower, so that the refrigerant recovery rate is lower. However, since the number of preparatory operations is increased as the refrigerant temperature is lower (up to four times), even in a cold state, most of the refrigerant in the above-mentioned pipeline can be removed without causing the compressor 1 to deteriorate. 1 can be collected on the discharge side. Further, when the refrigerant temperature is high, the number of preparation operations is reduced (minimum 1
After the refrigerant recovery operation of the last time is completed, the operation is directly shifted to the heating operation. Therefore, the preparation operation time can be shortened as much as possible, and the operation can be shifted to the heating operation at an early stage.

[C] The amount of the refrigerant remaining in the pipe becomes smaller (lower pressure) in the later refrigerant recovery operation. In the present embodiment, the recovery operation time is shortened for the later refrigerant recovery operation and {45 seconds → 40 seconds → 30 seconds → 25 seconds}, so that the load on the sliding portion of the compressor 1 is reduced. , Compressor 1
Contributes to the prevention of deterioration.

[D] During the lubrication operation, since the refrigerant heater 10 is operated in step s20 → step s22,
The temperature of the circulating refrigerant increases, the amount of circulating refrigerant increases, and the pressure of the refrigerant increases. Therefore, in the next refrigerant recovery operation {step s12 → step s17}, the compressor 1
Operates with high efficiency (increases the refrigerant recovery rate).

[E] When the gas burner 13 is operated during the final refrigerant recovery operation, the temperature of the refrigerant heater 10 and the refrigerant at the inlet and outlet of the refrigerant heater 10 rise. Therefore, when shifting to the heating operation, the heating operation can be quickly started by the preheating.

In the above embodiment, the preparatory operation is performed only when the operation is switched from the cooling operation to the heating operation. However, if the four-way valve 2 is energized during the heating operation but not performed during the cooling operation, the operation is not performed. Since the cooling cycle is formed even at the time of stoppage, it is necessary to perform the preparation operation every time the heating operation is started.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a circulation path of a refrigerant when a refrigerant heating type gas cooling and heating apparatus according to an embodiment of the present invention performs a cooling operation.

FIG. 2 is an explanatory diagram illustrating a circulation path of a refrigerant when a refrigerant heating type gas cooling and heating apparatus according to an embodiment of the present invention performs a heating operation.

FIG. 3 is a block diagram of the gas cooling / heating device.

FIG. 4 is an explanatory diagram showing a refrigerant recovery path when the refrigerant heating type gas cooling and heating apparatus according to one embodiment of the present invention performs a refrigerant recovery operation.

FIG. 5 is an explanatory diagram showing a moving path of a refrigerant when a refrigerant heating type gas cooling and heating apparatus according to one embodiment of the present invention is operated in a lubricating manner.

FIG. 6 is a flowchart showing the operation of the controller when the refrigerant heating type gas cooling and heating apparatus according to one embodiment of the present invention is in a preparatory operation.

FIG. 7 is a flowchart showing the operation of the controller when the refrigerant heating type gas cooling and heating apparatus according to one embodiment of the present invention is in a preparatory operation.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 First check valve 5 Capillary tube (decompressor) 6 Indoor heat exchanger 7 Second check valve 9 Two-way valve 10 Refrigerant heater A Refrigerant heating gas cooling / heating Equipment (refrigerant heating and cooling equipment)

Claims (6)

(57) [Claims] 1. During cooling operation, a compressor, a four-way valve, an outdoor heat exchanger, a first check valve, a decompressor, an indoor heat exchanger, the four-way valve, a second check valve, and the compressor are sequentially operated. A cooling cycle in which the refrigerant is circulated in an annular manner, and during a heating operation, the compressor, the four-way valve, the indoor heat exchanger, the two-way valve, the refrigerant heater, and the compressor are sequentially annularly connected to form a refrigerant. A heating cycle to circulate, when performing a heating operation, before starting the heating operation, the outdoor heat exchanger, the four-way valve, the second check valve, the compressor, the four-way valve, the room A heat exchanger is connected in order, the compressor is operated, and refrigerant in a pipe line from the upstream of the first check valve to the upstream of the second check valve is discharged to the discharge side of the compressor. Refrigerant recovery operation to move to the compressor, the four-way valve, the indoor heat exchanger, Way valve, the refrigerant heater, and the compressor sequentially with annular connection, the refrigerant heating type air conditioning apparatus for performing the preparation operation performed alternately and dry operation for operating the compressor. 2. The number of times of the preparatory operation is determined based on an outside air temperature or a temperature of a portion related to the outside air temperature.
The cooling / heating device of the refrigerant heating type described in the above. 3. The number of times of the preparatory operation is set to a predetermined number or determined based on the outside air temperature or the temperature of a portion related to the outside air temperature. 2. The refrigerant heating / cooling / heating apparatus according to claim 1, wherein the operation shifts to the heating operation without performing the lubrication operation. 3. 4. When the preparatory operation is performed twice or more, the recovery operation time is shortened as the refrigerant recovery operation is performed later.
A refrigerant heating / cooling / heating apparatus according to claim 2 or claim 3. 5. The refrigerant heater according to claim 1, wherein the refrigerant heater is operated during the lubrication operation.
The cooling / heating device of the refrigerant heating type described in the above. 6. The refrigerant heating / cooling / heating apparatus according to claim 1, wherein the refrigerant heater is operated during a final refrigerant recovery operation.