KR20120087385A - Air source water heater and operation control method thereof - Google Patents

Abstract

PURPOSE: An apparatus for heating air source water, and a control method thereof are provided to reduce a time for reaching the target temperature of water by reducing the amount of circulation water when the target temperature does not increase. CONSTITUTION: An apparatus for heating air source water comprises a coolant circulation circuit(100), a water circulation circuit(200), and a water temperature sensor(225). The coolant circulation circuit comprises a compressor(110), a condenser(120), an expand unit(130), and an evaporator(140). The water circulation circuit comprises a hot water storage tank and a water heat exchanger. The water heat exchanger is formed to heat exchange water with the condenser. As to the water circulation circuit, the water in the hot water storage circulates through the water heat exchanger. The water temperature sensor senses the temperature of the water from the water heat exchanger. A controller compares the temperature of the water with set temperature. The controller controls the compressor if the temperature of the water is lower than the set temperature.

Description

Air source water heater and its operation control method {AIR SOURCE WATER HEATER AND OPERATION CONTROL METHOD THEREOF}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air heat source hot water heater and an operation control method thereof, and more particularly, to an air heat source hot water heater and an operation control method thereof capable of shortening the arrival time to a target water discharge temperature.

An air heat source hot water supply device is provided with a refrigerant circulation circuit through which a refrigerant circulates, and a water circulation circuit through which water circulates, so that the refrigerant and water exchange heat to provide hot water (hot water).

The refrigerant circulation circuit may include a compressor that compresses the refrigerant, a condenser that condenses the refrigerant to dissipate heat, an expansion unit in which the refrigerant is expanded, and an evaporator in which the refrigerant absorbs latent heat of the surroundings and evaporates.

The water circulation circuit may include a low temperature water tank in which water is stored, and a water refrigerant heat exchanger configured to exchange heat with the condensation part of the refrigerant circulation circuit. The water circulation circuit may be provided with a pump to pump water.

A water pipe may be connected to one side of the storage tank so that water may be supplied into the storage tank. The water storage tank may be provided with a water discharge pipe to withdraw hot water.

By this configuration, the refrigerant compressed in the compressor is moved to the condensation unit. The refrigerant moved to the condenser is condensed by heat exchange with water, and the condensed refrigerant is expanded in the expansion part. The expanded refrigerant absorbs latent heat from the evaporator and evaporates, and the evaporated refrigerant is sucked into the compressor and compressed.

On the other hand, the water of the low-temperature tank is moved along the water circulation circuit, the heat exchange with the relatively high temperature refrigerant in the water refrigerant heat exchanger to increase the temperature. The water whose temperature is raised is introduced into the storage tank and temporarily stored. When the water outlet pipe is opened by a user, water is discharged to the outside of the water storage tank.

However, in the conventional air heat source water heater, the compressor is controlled based on the pressure during operation of the compressor, so that a relatively long time is required for the temperature of the water discharged from the reservoir to reach the target temperature. There is an inconvenience that the waiting time is long until exiting.

Accordingly, an object of the present invention is to provide an air heat source hot water heater and its operation control method which can shorten the time to reach the target water discharge temperature.

The present invention, to achieve the above object, a refrigerant circulation circuit for circulating the refrigerant having a compressor, a condensation unit, an expansion unit and an evaporator; A water circulation circuit having a water storage tank and a water refrigerant exchanger configured to exchange heat with the condensation unit, and wherein the water of the water storage tank is circulated through the water refrigerant exchanger; An outlet water temperature sensing unit sensing an outlet water temperature of the water refrigerant exchanger; And a controller configured to control an operating capacity of the compressor based on a result of detection of the water discharge temperature detecting unit.

Here, the controller compares the discharge water temperature detected by the discharge water temperature sensing unit with the set temperature, and when the discharge water temperature is lower than the set temperature, the capacity of the compressor until the discharge water temperature reaches the set temperature; It can be configured to control the compressor to increase this.

The water circulation circuit is provided with a pump, and the control unit may be configured to control the pump to reduce the amount of water circulation in the water circulation circuit when the discharge water temperature does not increase during the maximum capacity operation of the compressor.

The pump is an inverter pump, and the control unit may be configured to control to reduce the rotation speed of the pump so that the amount of water circulation can be reduced.

The water circulation circuit is provided with a flow rate control valve, the control unit to control the flow rate control valve so that the water circulation amount of the water circulation circuit is reduced when the discharge water temperature does not increase during the maximum capacity operation of the compressor Can be configured.

The pressure sensing unit for sensing the pressure of the compressor; further comprising, wherein the control unit may be configured to control to reduce the capacity of the compressor when the pressure sensed by the pressure sensing unit exceeds a set pressure. .

The compressor is an inverter compressor, and the control unit may be configured to control the number of revolutions of the compressor to be reduced so that the capacity of the compressor is reduced.

On the other hand, according to another field of the present invention, a refrigerant circulation circuit comprising a compressor, a condenser, an expansion unit and an evaporator circulating a refrigerant; And a water circulation circuit having a water storage tank and a water refrigerant heat exchanger configured to exchange heat with the condensation unit and the water of the water storage tank, wherein the water circulation circuit is circulated through the water refrigerant heat exchanger. An operation control method, comprising: detecting an exit temperature of the water refrigerant heat exchanger; And controlling the capacity of the compressor based on the sensed discharge water temperature.

Here, the controlling of the capacity of the compressor may include: decreasing the capacity of the compressor when the discharge water temperature is higher than a set temperature; Maintaining the capacity of the compressor when the water discharge temperature is equal to a set temperature; And increasing the capacity of the compressor when the discharge water temperature is lower than a set temperature.

When the water discharge temperature is lower than the set temperature, in the step of increasing the capacity of the compressor, when the water discharge temperature does not increase during operation of the maximum capacity of the compressor, further comprising the step of controlling to reduce the amount of water circulation Can be.

The water circulation circuit is provided with a flow rate control valve, and in the step of controlling the water circulation amount to be reduced may be configured to control the flow rate control valve.

The water circulation circuit is provided with an inverter pump, the step of reducing the amount of water circulation may be configured to reduce the number of revolutions of the pump.

Sensing the pressure of the compressor before the step of sensing the exit water temperature; And controlling the capacity of the compressor based on a pressure sensing result of the compressor.

The compressor may be an inverter compressor, and in the controlling of the capacity of the compressor, the compressor may be configured to control the rotation speed of the compressor.

As described above, according to an embodiment of the present invention, by controlling the compressor based on the water exit temperature of the water heat-exchanged with the refrigerant, the time to reach the target water exit temperature of the water is significantly shortened as compared with the conventional control of the compressor based on the pressure. can do.

In addition, it is possible to further shorten the time to reach the target discharge temperature of the water by reducing the amount of circulation of water when the discharge water temperature does not rise during the maximum capacity operation of the compressor.

1 is a block diagram of an air heat source hot water heater according to an embodiment of the present invention,
2 is a control block diagram of FIG. 1;
3 is a flowchart illustrating an operation control method of the air heat source water heater of FIG. 1;
4 is a flowchart illustrating an operation control method of an air heat source hot water heater according to another embodiment of the present invention;
5 is a configuration diagram of an air heat source hot water heater according to another embodiment of the present invention,
6 is a control block diagram of FIG. 5.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

As shown in FIG. 1, an air heat source hot water heater according to an embodiment of the present invention includes a refrigerant circulation circuit 100 in which a refrigerant is circulated, and a water circulation circuit circulated so that water may be heated by heat exchange with the refrigerant. 200 may be provided.

The refrigerant circulation circuit 100 may include a compressor 110, a condenser 120, an expansion unit 130, and an evaporator 140 to circulate the refrigerant. The refrigerant circulation circuit 100 may include a refrigerant pipe 150 for connecting each component.

The refrigerant may be compressed by the compressor 110, and the compressed refrigerant may be radiated and condensed by the condenser 120. The refrigerant condensed in the condenser 120 may expand in the expander 130 and may evaporate by absorbing the latent heat of the surroundings in the evaporator 140. One side of the evaporator 140 may be provided with a fan 145 to promote the air flow.

The compressor 110 may be configured as an inverter compressor 110 so that capacity thereof may be varied. The compressor 110 may include a plurality of inverters including at least one inverter compressor 110.

The compressor 110 may be provided with a pressure detecting unit 115 to detect the pressure.

The condenser 120 may be connected to the discharge side of the compressor 110.

The expansion part 130 and the evaporator 140 may be sequentially connected to the outlet side of the condensation part 120.

Meanwhile, the water circulation circuit 200 includes a water storage tank 210 and a water refrigerant exchanger 220 configured to exchange heat between the water of the water storage tank 210 and the condensation unit 120. In addition, the water of the storage tank 210 may be configured to be circulated through the water refrigerant exchanger 220. The water circulation circuit 200 may include water pipes 230 for connecting the water storage tank 210 and the water refrigerant heat exchanger 220.

The storage tank 210 may have a receiving space to accommodate a predetermined amount of water therein.

One side of the water storage tank 210 may be connected to the water supply pipe 211 to be supplied with water. The water supply pipe 211 may be connected to the bottom of the water storage tank 210. The water supply pipe 211 may be a water pipe.

The other side of the water storage tank 210 may be formed with an outlet 213 to allow the water inside to flow out. The outlet 213 may be formed in the lower region of the water storage tank 210. One side (water pipe 230) of the water circulation circuit 200 may be connected to the outlet portion 213.

Another inlet of the water storage tank 210 may be formed with an inlet 215 to allow water to flow therein. The inlet 215 may be connected to the other side (water pipe 230) of the water circulation circuit 200. The inlet 215 may be formed on an upper portion of the water storage tank 210. As a result, hot water (or high temperature water) in which the temperature is increased by heat exchange with the refrigerant may be stored in the inner upper region of the storage tank 210.

An upper portion of the water storage tank 210 may be provided with a water extraction unit 217 so that the water, more specifically hot water (or hot water) inside the water storage tank 210 may be withdrawn. The water outlet 217 may be provided with a valve 219 for opening and closing the flow path of the water outlet 217.

Meanwhile, a water refrigerant heat exchanger 220 may be connected to the water circulation circuit 200 so that the water in the water storage tank 210 may exchange heat with the refrigerant. The water refrigerant exchanger 220 may be configured to allow the refrigerant of the condensation unit 120 and the water flowing out of the water storage tank 210 to exchange heat with each other. For example, the water refrigerant exchanger 220 may be configured as a plate heat exchanger.

The water exit temperature sensing unit 225 may be provided at the water outlet side end of the water refrigerant exchanger 220 to detect the water exit temperature of the water. The water discharge temperature detection unit 225 may be composed of a temperature sensor.

One side of the water refrigerant heat exchanger 220 may be provided with a pump 240 to promote the flow of water. The pump 240 may be disposed on an inflow side (upstream side) of the water refrigerant heat exchanger 220. The pump 240 may be configured as an inverter pump 240 to enable flow rate (quantity) adjustment.

On the other hand, the air heat source hot water supply device may include a control unit 250 implemented by a microprocessor or the like provided with a control program. The controller 250 may be configured to detect the exit temperature of the water that is heat-exchanged by the water refrigerant exchanger 220 and to control the compressor 110 based on the detected exit temperature of the water.

The control unit 250 may be connected to a pressure detecting unit 115 for detecting the internal pressure of the compressor 110. As a result, the controller 250 may receive the pressure of the compressor 110 detected by the pressure sensing unit 115 as a signal and recognize the pressure of the compressor 110.

The compressor 110 and the pump 240 may be controllably connected to the controller 250, respectively.

In this configuration, the controller 250 may control the capacity of the compressor 110 based on the water discharge temperature of the water detected by the water discharge temperature detection unit 225. More specifically, when the water extraction temperature detected by the water extraction temperature detection unit 225 is lower than the set temperature, the controller 250 may increase the capacity of the compressor 110. The controller 250 may increase the capacity of the compressor 110 by increasing the rotation speed of the compressor 110 at a predetermined ratio.

In addition, the controller 250 may control the capacity of the compressor 110 based on the pressure of the compressor 110 detected by the pressure sensing unit 115. More specifically, the controller 250 is to reduce the capacity of the compressor 110 when the pressure of the compressor 110 sensed by the pressure sensing unit 115 exceeds a set pressure (maximum allowable pressure). The compressor 110 may be controlled. The controller 250 may reduce the capacity of the compressor 110 by reducing the rotation speed of the compressor 110 at a predetermined ratio.

In addition, the controller 250 controls the amount of water circulating in the water circulation circuit 200 to be reduced when the output water temperature of the water refrigerant exchanger 220 does not increase during the maximum capacity operation of the compressor 110. The outlet temperature can be raised.

More specifically, when the pump 240 is configured as an inverter pump 240 capable of variable speed, the controller 250 may control the rotation speed of the pump 240 to be reduced to reduce the amount of water circulation. Thereby, the water discharge temperature can reach the target water discharge temperature more quickly. Accordingly, the waiting time for exiting the waiter can be shortened, thereby enhancing user convenience.

Hereinafter, an operation control method of an air heat source hot water heater according to an embodiment of the present invention will be described with reference to FIG. 3.

As shown in FIG. 3, the operation control method of the present air heat source hot water heater includes: detecting an exit temperature of the water refrigerant heat exchanger 220 (S140); And controlling the capacity of the compressor 110 based on the sensed discharge water temperature (S160, S165, and S175).

In addition, the operation control method of the air heat source water heater, the step (S120) of detecting the pressure of the compressor 110 before the step (S140) of detecting the exit temperature of the water refrigerant heat exchanger 220, The method may further include controlling the capacity of the compressor 110 when the sensed pressure exceeds the set pressure based on the pressure (S135).

More specifically, when the operation of the compressor 110 is started (S110), the controller 250 allows the pressure sensing unit 115 to sense the pressure of the compressor 110 (S120).

The controller 250 compares the pressure sensed by the pressure detector 115 with a set pressure (S130), and when the detected pressure is less than or equal to the set pressure as a result of the pressure comparison, the water discharge temperature detector 225. By so that the water exit temperature of the water refrigerant heat exchanger 220 is detected (S140).

Next, the controller 250 compares the detected water extraction temperature Ti and the set temperature Ts (S150), and when the detected water extraction temperature Ti is less than the set temperature Ts, the compressor ( By controlling the 110, the capacity of the compressor 110 is increased (S160). Here, the controller 250 may be configured to increase the capacity of the compressor 110 by increasing the number of revolutions of the compressor 110 by a predetermined ratio (set ratio). As a result, unlike the conventional method of controlling the operation of the compressor 110 based on the pressure, the water exit temperature of the water refrigerant exchanger 220 may increase more quickly.

On the other hand, as a result of comparison, if the detected water extraction temperature (Ti) is equal to the set temperature (Ts) (S155), the controller 250 controls the compressor 110 to control the current operating state of the compressor 110. To maintain the (speed) (S165).

In addition, as a result of the comparison, when the detected water extraction temperature Ti exceeds the set temperature Ts (S155), the compressor 110 is controlled to reduce the capacity of the compressor 110 (S175). Here, the controller 250 may be configured to reduce the capacity of the compressor 110 by reducing the number of revolutions of the compressor 110 by a predetermined ratio.

Meanwhile, as a result of the pressure comparison, when the detected pressure Pi of the compressor 110 exceeds the set pressure Ps (S130), the controller 250 controls the compressor 110 to control the compressor ( The capacity of 110 is reduced (S135). Here, the controller 250 may be configured to reduce the capacity of the compressor 110 by reducing the number of revolutions of the compressor 110 by a predetermined ratio.

Hereinafter, an operation control method of an air heat source hot water heater according to another embodiment of the present invention will be described with reference to FIG. 4. Detailed descriptions of components overlapping with those described above will be omitted.

As shown in FIG. 4, the operation control method of the present air heat source hot water heater includes: detecting an exit temperature Ti of the water refrigerant heat exchanger 220 (S140); And controlling the capacity of the compressor 110 based on the detected water extraction temperature Ti (S160, S165, and S175).

In addition, the operation control method of the air heat source hot water heater, the step (S120) of detecting the pressure of the compressor 110 before the step (S140) of detecting the water extraction temperature (Ti) of the water refrigerant heat exchanger (220) and The method may further include controlling the capacity of the compressor 110 based on the detected pressure Pi (S135).

More specifically, the controller 250 compares the detected water extraction temperature Ti and the set temperature Ts (S150), and when the detected water extraction temperature Ti is less than the set temperature Ts (S150), the compressor The rotation speed Ri of the 110 is sensed (S170).

When the rotation speed Ri of the compressor 110 is the maximum rotation speed Rmax (S180), the controller 250 calculates an amount of change in water output temperature ΔTi of the water refrigerant exchanger 220 (S190). ).

The controller 250 compares the calculated discharge water temperature change amount ΔTi to a set value ΔTs (S200), and controls the pump 240 when the calculated discharge water temperature change amount ΔTi is less than or equal to a set value ΔTs. By reducing the rotational speed of the pump 240 by a predetermined ratio (S210). Here, the set value ΔTs may be set to a small value so that the case where there is little increase in the water extraction temperature Ti may be determined. That is, when the water extraction temperature change amount ΔTi is less than or equal to the set value ΔTs, it means that the water extraction temperature Ti is not substantially raised when there is little change in the water extraction temperature change amount ΔTi.

More specifically, the controller 250 is the water refrigerant exchanger 220 when the compressor 110 is operated at the maximum capacity (maximum rotation speed Rmax) does not rise almost, By reducing the circulation amount (water quantity) of the water flowing into the water, it is possible to increase the water extraction temperature of the water refrigerant exchanger 220. Thereby, the desired water extraction temperature (target water extraction temperature) can be reached more quickly.

On the other hand, the controller 250, if the rotation speed Ri of the compressor 110 is less than the maximum rotation speed (Rmax) (S180), the compressor 110 to maintain the current state (speed) (S185) ). In addition, the controller 250 allows the pump 240 to be operated in the current state (maintained rotational speed) when the calculated discharge water temperature change amount ΔTi is larger than the set value ΔTs (S200). .

Hereinafter, an air heat source water heater according to another embodiment of the present invention will be described with reference to FIGS. 5 and 6. The same reference numerals and the same components as the above-described and illustrated configurations are denoted by the same reference numerals for convenience of description, and detailed description thereof will be omitted.

As shown in FIG. 5, the air heat source water heater may include a refrigerant circulation circuit 100 through which a refrigerant is circulated, and a water circulation circuit 200 through which water is exchanged with the refrigerant to be heated. Can be.

The refrigerant circulation circuit 100 includes a compressor 110 for compressing a refrigerant, a condenser 120 for condensing a refrigerant, an expansion unit 130 for expanding a refrigerant, and an evaporator 140 for absorbing latent heat and evaporating the refrigerant. It may be provided. Here, the compressor 110 may be configured as an inverter compressor 110 to vary the capacity.

The water circulation circuit 200 includes a water storage tank 210 and a water refrigerant exchanger 220 through which water in the water storage tank 210 may exchange heat with the condensation unit 120. The water of 210 may be circulated through the water refrigerant exchanger 220.

The water circulation circuit 200 may be provided with a pump 260 to promote the flow of water.

The water circulation circuit 200 may be provided with a flow control valve 265 to adjust the amount of water circulation (flow rate). In this embodiment, the flow rate control valve 265 is exemplified in the case where the flow control valve 265 is arranged on the inflow side (upstream side) of the water refrigerant exchanger (220).

As shown in FIG. 6, the air heat source hot water heater may include a control unit 250 that is implemented by a microprocessor or the like having a control program.

In the control unit 250, the water extraction temperature detection unit 225 for detecting the water extraction temperature of the water refrigerant heat exchanger 220 and the pressure detection unit 115 for detecting the pressure of the compressor 110 are controllable. Can be connected.

The control unit 250 may control the compressor 110 to adjust the capacity and the water circulation of the compressor 110 based on the pressure of the compressor 110, the water discharge temperature and the water discharge temperature change of the water refrigerant exchanger 220. ), The pump 260 and the flow control valve 265 may be controllably connected to each other.

By such a configuration, the controller 250 may increase the rotational speed of the compressor 110 by a predetermined ratio when the water extraction temperature detected by the water extraction temperature detection unit 225 is lower than a set temperature. ) Capacity can be increased.

In addition, when the pressure of the compressor 110 detected by the pressure sensing unit 115 exceeds a set pressure (maximum allowable pressure), the controller 250 may reduce the capacity of the compressor 110. The capacity of the compressor 110 may be reduced by reducing the number of revolutions of the engine 110 at a constant ratio.

On the other hand, the control unit 250 is the water circulation circuit when the water extraction temperature change of the water refrigerant exchanger 220 is less than the set value when the maximum capacity operation of the compressor 110 is less than the set value, the water circulation circuit ( The flow rate control valve 265 may be controlled to reduce the amount of water circulating in 200 so that the water outlet temperature may be increased. Thereby, the water discharge temperature can reach the target water discharge temperature more quickly. Accordingly, the waiting time for exiting the waiter can be shortened, thereby enhancing user convenience.

In the above, specific embodiments of the present invention have been shown and described. However, the present invention can be embodied in various forms without departing from the spirit or essential features thereof, so the embodiments described above should not be limited by the details of the detailed description.

Further, even when the embodiments not listed in the detailed description have been described, it should be interpreted broadly within the scope of the technical idea defined in the appended claims. It is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

100: refrigerant circulation circuit 110: compressor
115: pressure detection unit 120: condensation unit
130: expansion portion 140: evaporator
145 fan 150 refrigerant piping
200: water circulation circuit 210: low temperature bath
211: water supply pipe 213: outlet
215: inlet 217: water outlet
219: valve 220: water refrigerant heat exchanger
225: water discharge temperature detection unit 230: water pipe
240 pump 250 control unit

Claims (14)

A refrigerant circulation circuit having a compressor, a condenser, an expansion unit, and an evaporator, in which a refrigerant is circulated;
A water circulation circuit having a water storage tank and a water refrigerant exchanger configured to exchange heat with the condensation unit, and wherein the water of the water storage tank is circulated through the water refrigerant exchanger;
An outlet water temperature sensing unit sensing an outlet water temperature of the water refrigerant exchanger; And
A control unit controlling an operating capacity of the compressor based on a detection result of the water discharge temperature detecting unit;
Air heat source hot water heater comprising a. The method of claim 1,
The controller compares the discharge water temperature detected by the discharge water temperature sensing unit with a set temperature, and when the discharge water temperature is lower than the set temperature, the capacity of the compressor increases until the discharge water temperature reaches the set temperature. Air heat source hot water heater, characterized in that for controlling the compressor. The method of claim 2,
A pump is provided in the water circulation circuit, and the control unit controls the pump to reduce the amount of water circulating in the water circulation circuit when the discharge water temperature does not increase during the maximum capacity operation of the compressor. Water heater. The method of claim 3,
The pump is an inverter pump, and the control unit is an air heat source hot water heater, characterized in that for reducing the rotation speed of the pump so that the water circulation amount is reduced. The method of claim 2,
The water circulation circuit is provided with a flow control valve, the control unit controls the flow control valve so that the water circulation amount of the water circulation circuit is reduced when the discharge water temperature does not increase during the maximum capacity operation of the compressor. Air heat source hot water heater. The method according to any one of claims 1 to 5,
Further comprising: a pressure sensing unit for sensing the pressure of the compressor,
And the controller controls the capacity of the compressor to be reduced when the pressure sensed by the pressure sensing unit exceeds a set pressure. The method of claim 6,
The compressor is an inverter compressor, and the control unit reduces the number of revolutions of the compressor to reduce the capacity of the compressor air heat source hot water heater. A refrigerant circulation circuit having a compressor, a condenser, an expansion unit, and an evaporator, in which a refrigerant is circulated; And a water circulation circuit having a water storage tank and a water refrigerant heat exchanger through which the water of the water storage tank can exchange heat with the condensation unit, and the water of the water storage tank is circulated through the water refrigerant exchanger. As a method,
Sensing the exit temperature of the water refrigerant heat exchanger; And
Controlling the capacity of the compressor based on the sensed exit water temperature;
Operation control method of the air heat source hot water heater comprising a. The method of claim 8,
Controlling the capacity of the compressor,
Reducing the capacity of the compressor when the water discharge temperature is above a set temperature;
Maintaining the capacity of the compressor when the water discharge temperature is equal to a set temperature; And
And increasing the capacity of the compressor when the water discharge temperature is lower than a set temperature. 10. The method of claim 9,
If the discharge water temperature is lower than the set temperature, increasing the capacity of the compressor, further comprising controlling the amount of water circulation to decrease when the discharge water temperature does not increase during operation of the maximum capacity of the compressor. Operation control method of the air heat source water heater. The method of claim 10,
The water circulation circuit is provided with a flow control valve,
And controlling the flow rate regulating valve in controlling the water circulation amount to be reduced. The method of claim 10,
The water circulation circuit is provided with an inverter pump,
In the step of reducing the amount of water circulation, the operation control method of the air heat source hot water heater, characterized in that for reducing the rotation speed of the pump. 13. The method according to any one of claims 8 to 12,
Before the step of sensing the exit water temperature,
Sensing the pressure of the compressor; And
And controlling the capacity of the compressor based on a result of the pressure sensing of the compressor. The method of claim 13,
The compressor is an inverter compressor,
In the step of controlling the capacity of the compressor, the operation control method of the air heat source hot water heater, characterized in that for controlling the number of revolutions of the compressor.

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