JPH09287758A - Air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a frosting on inner and outer surfaces of a fan coil, wherein the fan coil unit is provided with a humidity sensor and starts an operation of an air blow fan when the humidity sensor detects dewing in the unit. SOLUTION: When a condensate occurs in the vicinity of a heat exchanger 3, a humidity sensor 11 detects this condensate and feeds a detected signal to a controller 13 by way of a signal line a. In an operation circuit of the controller 13, an electric current which corresponds to a 'weak' blow mode is automatically fed to an air blow fan 5 by way of a line (b) and the air blow fan 5 starts a 'weak' blow operation. Due to such a construction, even when a cold water is continuously supplied to the heat exchanger 3, no further dewing occurs thus preventing a frosting on inner and outer surfaces of the fan coil unit 1.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an air conditioner having a fan coil unit.

[0002]

2. Description of the Related Art Generally, an air conditioner including a fan coil unit having a heat exchanger with a blower fan is known. In this type, cooling operation is performed by supplying cold water to a heat exchanger with a blower fan, and heating operation is performed by supplying hot water (Japanese Patent Publication No. 5-36692). .

[0003]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
After stopping the blower fan, if cold water is continuously supplied to the heat exchanger for a long time, dew condensation will occur on the heat exchanger,
After all, there is a problem that dew condensation occurs on the inner and outer surfaces of the fan coil unit.

In order to prevent this, conventionally, after the blower fan is stopped, the valve is closed to stop the flow of water to the heat exchanger, or when the flow of water cannot be stopped, the operation switch of the blower fan is stopped. Is set to "weak" to perform blowing operation with weak wind. However, the operation of closing the valve and setting the operation switch of the blower fan to "weak" is a manual operation, so if you forget to operate it, there is a problem that it is not possible to prevent dew on the inner and outer surfaces of the fan coil unit. is there.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems of the conventional technique and to close the fan coil without manually operating the fan switch or closing the operation switch of the blower fan. An object of the present invention is to provide an air conditioner capable of preventing dew on the inner and outer surfaces of a unit.

[0006]

The invention according to claim 1 is an air conditioner provided with a fan coil unit having a heat exchanger with a blower fan, wherein the fan coil unit is provided with a humidity sensor, and this humidity is provided. When the sensor detects dew condensation on the fan coil unit, a control means for operating the blower fan is provided.

According to a second aspect of the present invention, in an air conditioner equipped with a fan coil unit having a heat exchanger with a blower fan, a humidity sensor is provided in or near the heat exchanger of the fan coil unit, and the humidity is set. A control means is provided for starting the operation of the blower fan when dew condensation is detected by the sensor in the heat exchanger or in the vicinity thereof.

According to a third aspect of the present invention, in an air conditioner provided with a fan coil unit having a heat exchanger with a blower fan, a humidity sensor is provided in a ventilation path of the fan coil unit, and ventilation is performed by the humidity sensor. A control means is provided for starting the operation of the blower fan when dew condensation is detected on the road.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment according to the present invention will be described below with reference to the drawings.

In FIG. 1, reference numeral 1 indicates a fan coil unit for air conditioning the conditioned room. The fan coil unit 1 includes a heat exchanger 3 and a blower fan 5, and the heat exchanger 3 is connected to pipes 7 and 9 for supplying cold water or hot water. An on-off valve 15 is connected to the branch pipe 9a of the pipe 9.

The heat exchanger 3 of the fan coil unit 1 has a humidity sensor (cold water sensor) 11 for detecting condensed water generated on or near the surface of the piping of the heat exchanger 3.
Is provided. The humidity sensor 11 sends a humidity detection signal to the controller 13 via the signal line a. As shown in FIG. 4, the controller 13 has an operation switch SW.
By manually switching the operation mode of the operation switch SW (off, weak, medium, strong), it is possible to manually set the blow rate of the blower fan 5. The controller 13 is connected to the motor FM of the blower fan 5 via the wiring b.

FIG. 2 shows an example of the operation circuit of the operation switch SW. As shown in FIG. 2, the humidity sensor 11 is connected in parallel to the “OFF” circuit of the operating circuit, and the operating circuit is “OFF” at normal times, that is, when the humidity is not rising.
Therefore, no current is supplied to the motor of the blower fan 5. However, as described later, even if the operation switch SW is not set to "weak", the humidity sensor 11
Is turned on (closed), the circuit current automatically flows in the mode of "weak" blowing, and the blower fan 5 operates at a rotation speed corresponding to this "weak".

Next, the operation of the fan coil unit 1 will be described.

Cooling operation is performed by supplying cold water to the heat exchanger 3 having the blower fan 5, and heating operation is performed by supplying hot water. In the cooling operation, if the cooling water is continuously supplied to the heat exchanger 3 for a long time after the blower fan 5 is stopped, dew condensation occurs on the heat exchanger 5 and eventually the inner and outer surfaces of the fan coil unit 1 are exposed. Dew may occur.

In order to prevent this, after stopping the blower fan 5, as shown in FIG. 3, the suction grill 103 of the decorative panel 101 is opened, and a hand is put in to manually close the on-off valve 15 described above. , Stop the flow of water to the heat exchanger 3,
Alternatively, when the water flow cannot be stopped, as shown in FIG. 4, the operation switch SW of the blower fan 5 is set to "weak" to perform a blowing operation with a weak wind.

However, the operation of closing the on-off valve 15 and setting the operation switch SW of the "strong", "medium", and "weak" blower fans 5 to, for example, "weak" is a manual operation. However, if the operator forgets to operate this, it is impossible to prevent the dew condensation on the inner and outer surfaces of the fan coil unit 1.

Therefore, according to this embodiment, even if the operator forgets to operate the above-mentioned operation and the cold water is left supplied to the heat exchanger 3 for a long time, it is close to the heat exchanger 3. When condensed water is generated at the humidity sensor 11, the condensed water is detected by the humidity sensor 11, and the detection signal is sent to the controller 13 via the signal line a. Then, as described above, the operation circuit of the controller 13 (see FIG. 2) automatically supplies the blower "weak" mode current to the blower fan 5 through the wiring b, so that the blower fan 5 operates in "weak" mode. To start.

As described above, even if a situation in which the cold water continues to flow to the heat exchanger 3, no further dew condensation will occur, so that the inner and outer surfaces of the fan coil unit 1 will not be formed. It is possible to prevent the formation of dew. Therefore, since the heat insulating material and the like on the inner and outer surfaces of the fine coil unit, which have been conventionally required, are not required, the cost of the fan coil unit 1 described above can be reduced accordingly.

As another embodiment, the humidity sensor 11 described above can be provided in the ventilation path (not shown) of the fan coil unit 1. Humidity sensor 1 in the ventilation path
In the case where No. 1 is provided, the "weak" operation of the blower fan 5 may be started when dew condensation is detected in the ventilation passage through the humidity sensor 11. When the humidity sensor 11 is provided in the ventilation passage, it is desirable to provide the humidity sensor 11 in an area where condensed water can easily pass.

In the above embodiment, the humidity sensor 1
A display lamp L (see FIG. 2) or the like may be provided on the display surface of the remote controller so that the operation can be visually confirmed when the dew condensation is detected by the device 1.

[0021]

As is apparent from the above description, according to these inventions, the fan coil unit is provided with the humidity sensor, the humidity sensor detects the dew condensation of the fan coil unit, and based on the result, the air is blown. Since it is designed to operate the fan, no further condensation will occur.

[Brief description of drawings]

FIG. 1 is a circuit diagram showing an embodiment according to the present invention.

FIG. 2 is an operation circuit diagram.

FIG. 3 is a perspective view showing a fan coil unit.

FIG. 4 is a diagram showing an operation switch.

[Explanation of symbols]

 1 Fan Coil Unit 3 Heat Exchanger 5 Blower Fan 7 Piping 9 Piping 11 Humidity Sensor 13 Controller 15 Open / Close Valve SW Operation Switch

Claims (3)

[Claims] 1. An air conditioner including a fan coil unit having a heat exchanger with a blower fan, wherein a humidity sensor is provided in the fan coil unit, and when dew condensation is detected in the fan coil unit by the humidity sensor, An air conditioner comprising means for starting the operation of the blower fan. 2. An air conditioner provided with a fan coil unit having a heat exchanger with a blower fan, wherein a humidity sensor is provided at or near the heat exchanger of the fan coil unit, and the heat exchanger or the vicinity thereof is provided by this humidity sensor. An air conditioner comprising means for starting operation of the blower fan when dew condensation is detected. 3. An air conditioner including a fan coil unit having a heat exchanger with a blower fan, wherein a humidity sensor is provided in a ventilation path of the fan coil unit,
An air conditioner characterized by comprising control means for starting the operation of the blower fan when dew condensation is detected in the ventilation passage by the humidity sensor.