JPS594846A - Control circuit for changeover type air conditioner - Google Patents

Abstract

PURPOSE:To simplify the wiring work for the titled air conditioner by a method wherein the case of a wiring device for the heat pump type air conditioner according to a conditioning unit system, the number of connecting wires for outdoor units and indoor units is reduced. CONSTITUTION:Wires 40 and 41 transmit operation signals to a switching control circuit 30 and wires 42 and 43 tansmit common signals to the circuit 30 at three staged different voltages such that when the operation of a compressor is stopped, the voltage is 0V, when the compressor is operated and a sensing section is OFF, the voltage is 5V and when the sensing section is ON, the voltage is 10V. Designated by numerals 44 and 45 are wires for four-way valves. These wires are impressed with 0V when a cooling operation is ON and 24V when a heating operation is ON. In the case of the above wiring, if, for example, a first indoor unit 26 is used as a preference circuit and when a voltage higher than 5V is impressed on the circuit, the circuit receives no signal applied on an indoor unit 27 from an outdoor unit control circuit 29 inrrespective of the level of the voltage of the signal. According-only three wires are required for connecting the two indoor units and the outdoor unit and the work of wiring for selecting a preference circuit can be dispensed with.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wiring connection device for a condensing unit type no-heat pump type air conditioner, and relates to an outdoor unit,
The purpose is to reduce the number of wires connected to indoor units and simplify wiring work.

Conventionally, in a condensing uni-soto system, that is, a separate heat pump type air conditioner, for example, two indoor units were not connected to one outdoor unit, and one of the two indoor units was given priority. For those that operate, the connections and wiring are as shown in Figure 1. Figure 1, 1 is the outdoor unit, 2 is the unit 1 indoor unit, 3
In the case of the No. 2 indoor unit, the outdoor unit 1 includes a control circuit body 5 that controls the compressor, blower, solenoid valve, etc. connected to the outdoor power source 4, the No. 1 indoor unit 2, and the No. 2 indoor unit 3. A switching circuit 6 receives a signal from this switching circuit 6, and connects a priority circuit 9 connected to the control circuit 8 of the indoor unit and a four-way valve control circuit 1o through the priority circuit wire of the No. 1 indoor unit 2. It is set up. Inside the No. 1 indoor unit 2, there is a sensing section 11 derived from the control circuit 8. A blower 12 and a power supply 13 for the No. 1 indoor unit are provided. Unit 2 indoor unit 3
As with the first machine, the control circuit 14. Sensing unit 15. A blower 16 and a power supply 17 for the No. 2 indoor unit are provided, respectively.

In this way, in the past, electronically controlled wiring was connected between the outdoor unit 1, the No. 1 indoor unit 2, and the No. 2 indoor unit 3, and these two-wire OV or 24V operation signal wiring 18.18a.

Common wiring 19.19a, OV or 24V four-way valve control circuit wiring 20.20a, three wires connected to the No. 1 indoor unit 2, and three wires connected to the No. 2 indoor unit 3. In addition, for example, as shown in the figure, when the No. 1 indoor unit 2 is to be operated preferentially, the priority circuit wiring must be connected to the control circuit 8. had the disadvantage that it required four wires and the wiring work was time-consuming.

The present invention solves the above-mentioned conventional drawbacks, and one embodiment thereof will be described below with reference to FIG. 2. 2
5 is an outdoor unit, 26 is a No. 1 indoor unit, 27 is a No. 2 indoor unit, and the outdoor unit 26 has an outdoor power source 28. connected to an outdoor power source 28. compressor, blower,
A control circuit main body 29 that electronically controls solenoid valves, etc., a switching control circuit 30 for the No. 1 and No. 2 switching circuits that makes the No. 1 indoor unit 26 a priority circuit (priority operation, simultaneous operation is not possible)
, an electronically controlled four-way valve switching circuit 31 is provided in an electrical equipment box (not shown).

In the No. 1 indoor unit 26, a control circuit 33 connected to the indoor power supply 32 is connected to the indoor power supply 32, and the room temperature is detected by the control circuit 33, and the air blower 34. A sensing section 35 for sensing room temperature is provided to control the compressor and the like within the control circuit main body 29. In the No. 2 indoor unit 27, there is also a control circuit 37 connected to the indoor power source 36, and a sensing section 38 which is derived from the control circuit 37 and senses the room temperature. A blower 39 is provided. 40.41 is the driving signal wiring, 42.43
is the common signal wiring, and these wirings 40, 41゜42
．． 43 is set to change the voltage difference in three stages: ○V when the compressor is stopped, 5V when the compressor is running and the sensing part is OFF, and 10V when the sensing part is ON. Control circuit 3
I am trying to send a signal to the 0 side. 44.46 is the connection wiring for the four-way valve that applies Ov1 during cooling and 24V during heating.In addition, in these wirings, for example, if the No. 1 indoor unit 26 side is the main usage room and the priority circuit is , when a voltage of 5V or more is applied from the No. 1 indoor unit 26, the control circuit main body 29 of the outdoor unit accepts the signal, regardless of the signal voltage on the No. 2 indoor unit 27 side. There is no circuit.

In the two-constant configuration, these one-to-two separated type air conditioners are switched to perform either one of the operations. For example, when the No. 1 indoor unit 26 is desired to be the priority circuit, the switching control circuit Incorporating a priority circuit at 30,
The No. 1 indoor unit 26 is determined as a priority circuit and wiring connection is performed. Therefore, the No. 1 indoor unit 26 is installed in the room that will be the main use room, and the No. 2 indoor unit 27 is installed in another room.
By installing the unit 1 indoor unit 26,
Priority operation is given, and unless the No. 1 indoor unit 26 is stopped, the No. 2 indoor unit 27 will not be operated.

In this way, the present invention provides a switching control circuit for an outdoor unit,
A priority circuit is installed in either the No. 1 or No. 2 indoor unit, and between this 1:2 indoor and outdoor units, the voltage between the operation signal wiring and the common signal wiring is set to OV when stopped, and to the sensing section. The circuit is configured so that the voltage is 5V when the sensor is OFF and the voltage is IOV when the sensor is ON.The circuit is connected so that either the No. 1 indoor unit or the No. 2 unit becomes the priority circuit, so the indoor This means that only three wires are needed between each of the two indoor units and between the outer units, and there is no need to connect a priority circuit to give priority to one of the two as required in the past. Also, for example, when the No. 2 indoor unit side is set as a priority circuit (this includes after the general installation), each of the three wirings 40, 42, 44, 41, 43.
If 45 is wired in the opposite direction, the No. 2 indoor unit 2 becomes the priority circuit, and the priority circuit can be easily switched, which has practical effects such as advantages in wiring work. .

[Brief explanation of the drawing]

Fig. 1 is a wiring diagram with priority circuit wiring for the conventional outdoor unit, the No. 1 indoor unit, and the No. 2 indoor unit, and Fig. 2 is a wiring diagram of the outdoor unit and the It is a wiring diagram of the No. 1 indoor unit and the No. 2 indoor unit. 26...Outdoor Uniso), 26,2 completed...
・Indoor unit, 40.41...Operating signal wiring, 42°43...Common signal wiring, 44.
46... Connection wiring for four-way valve.

Claims (1)

[Claims] In order to connect multiple indoor units to one outdoor unit and set one of the indoor units as a priority circuit, wiring for operation signals, wiring for common signals, A control circuit for a switching type air-conditioning/heating machine, in which connection wiring for a four-way valve is provided, a voltage difference is provided between the operation signal wiring and the common signal wiring, and a control circuit is configured using this voltage difference.