JPS613941A - Controlling method of air-conditioning machine - Google Patents

Abstract

PURPOSE:To prevent freezing of city water pipe or the like by a method wherein a condenser is provided with an auxiliary heater, conducted to heat the inside of a room when the air-conditioning machine is stopped and room temperature is lower than a set value, in the heat pump type air-conditioning machine. CONSTITUTION:When the atmospheric temperature reduces to a value lower than a predetermined value under a condition that the air-conditioning machine is being stopped and a manual switch, not shown in the diagram, is being put On, the auxiliary heat source heater 10, provided on the condenser, is conducted by the operation of a micro-processor, not shown in the diagram, and the room is heated until the temperature thereof becomes the predetermined temperature. Thus, room heating is effected by the auxiliary heater until the room temperature arrives at the temperature capable of preventing the freezing of city water pipe or the like even when the room heating effected by the heat pump is not being effected and damage, due to the reduction of atmospheric temperature, may be prevented.

Description

Detailed Description of the Invention (a) Industrial Application Field The present invention relates to the control of an air conditioner that can heat a room to be conditioned using a heat pump cycle and an electric heater for an auxiliary heat source. The present invention relates to a control method that performs heating using an electric heater when the room temperature of a conditioned room falls below a predetermined value when the operation is stopped.

(b) Prior art In general, the conventional control method for air conditioners is
There was one as described in the -47291 publication. This publication states that an air conditioner with a heat pump cycle is equipped with an electric heater as an auxiliary heat source, and when the outside air temperature drops and the heat pump cycle cannot reach its full capacity, the electric heater is energized to compensate for the lack of heating capacity. For example, when the air conditioner is stopped when you go out or at night, even if the room temperature in the room to be conditioned drops due to the drop in outside temperature, the air conditioner will continue to operate. The system remained shut down, and in some cases, doors and windows froze, or water pipes froze, causing damage.

(c) Purpose of the Invention In view of the above problems, the present invention provides a control method that automatically starts auxiliary heating of a conditioned room when the room temperature of the conditioned room drops even when the air conditioner is stopped. It provides:

B) Structure of the Invention The method for controlling an air conditioner according to the present invention is an air conditioner having a heat pump cycle in which a compressor, a condenser, a pressure reducing device, and an evaporator are sequentially connected in a ring through refrigerant piping. An electric heater is installed as an auxiliary heat source, and if the room temperature in the conditioned room falls below a predetermined value when the air conditioner is stopped, the electric heater will be used for heating. The heating operation using the electric heater is automatically performed when the room temperature of the room to be conditioned drops.

(E) Embodiment Below, embodiments of the present invention will be explained based on FIGS. 1 to 8. First, FIG. 1 is a refrigerant circuit diagram showing an embodiment of the present invention. , four-way valve (2), indoor heat exchanger (3), liquid reservoir (4), pressure reducer (5), (6), and outdoor heat exchanger (7) are connected in a ring with refrigerant piping for refrigeration. constitutes a cycle. Note that (8) is a reverse valve through which the refrigerant passes only when the refrigerant flows in the direction of the dotted line (during cooling operation). Further, (9) and (g) are the first and second electric heaters, which are 2KW and 3KW, respectively. α force is the indoor heat exchanger (
3) is a blower (cross flow fan), and (2) is a blower (propeller fan) for the outdoor heat exchanger (7).

In this figure, if the four-way valve (2) is in the position shown, the refrigerant discharged from the compressor (1) flows in the direction of the solid arrow, and the indoor heat exchanger (3) is connected to the condenser and the outdoor heat exchanger, respectively. The exchanger (7) acts on the evaporator to perform heating operation. Also, if the four-way valve (2) is switched to the opposite position to the one shown in the diagram,
The refrigerant discharged from the compressor (1) flows in the direction of the dotted arrow, and the indoor heat exchanger (3) is connected to the evaporator and the outdoor heat exchanger (3), respectively.
7) acts as a condenser to perform cooling operation.

Figures 2 and 3 are electrical circuit diagrams used to control the operation of the refrigeration cycle shown in Figure 1, and between Figures 2 and 3 are ■ and ■.
connected with. Furthermore, the same components as in FIG. 1 include a compressor (1), a four-way valve (2), a first electric heater (9),
The second electric heater αQ, the indoor fan (b), and the outdoor fan (2) are not given the same reference numerals.

The wind speed of the blower αη can be switched between strong (H), medium (M), and weak (L), and the blower (2) can be switched between strong (H) and weak (L).
) The wind speed can be changed.

In FIGS. 2 and 3, 0 is a microprocessor that operates with the following peripheral circuits.

The details of the operation of this microprocessor (2) will be described later. α4 is a power supply circuit, which includes a rectifying element aQ, a smoothing capacitor a0, an α power, a Zener diode (to), a power transistor Q normally closed contact wire, and a comparison that resets the microprocessor side terminal (INIT) when the power is turned on. It is composed of a buffer (a) that supplies a constant voltage (v, mr) lower than the voltage (v, mr) of the device Φ, (ii) Ao, and the like.

Note that the terminal (DD) is a negative power supply terminal. The handle is a remote control panel with a manual switch (goods) and a changeover switch (c)
is installed separately from the main body of the air conditioner. In addition, the changeover switch (c) is the terminal where the contact piece is switched, (to),
(If the terminal (2) is a neutral terminal and the terminal (2) is a neutral terminal, the contact will automatically return to the terminal ■ when the contact is switched to the terminal captive, and the terminal (G) and (0) can be manually switched. In addition, the manual switch (F) changes the temperature setting range, and the changeover switch (A) stops the operation of the air conditioner, and they are separated by three wires. is a light-emitting element, which lights up when the manual switch (c) or selector switch (2) is operated. Sections (b) to (b) are relays that operate with signals applied from terminals (D6) to (DI 2 ) of the microprocessor (to) via buffers (to); , normally open contact piece), normally open contact piece, switching contact piece), ring, switching contact piece■
, 2), a normally open contact piece-1 and a normally open liquid piece (b). The ring is a rapid heating switch, which keeps relays (b) and (2) energized regardless of the output of the microprocessor (to). Note that the ring (6) is a diode for preventing malfunction.

61) to □□□, 17) are microprocessors (2)
Terminals (D3) to (D5), (DI 5)
A temperature sensor (such as a negative characteristic thermistor) connected between
These are, in order, for detecting the room temperature inside the room to be conditioned, for detecting the temperature of the indoor heat exchanger (3), for detecting the temperature of the outdoor heat exchanger (7), and for detecting the outdoor temperature. f54) is a slide switch for temperature setting, and the microprocessor (
2) When there is an output at the terminal (Dl), the terminals (K1) to (K4) are scanned to read the set value. Note that frames 69 to 6 are diodes for preventing erroneous reading. This is a slide switch that sets the wind speed of the 64-word blower α, and when there is an output at the terminal (Do) of the microprocessor α→, it scans the terminals (K1) to (K4) and reads the set value. Note that -1 is a diode for preventing erroneous reading. 12. Ki is driving/
These are a stop switch and a heating/cooling operation selection switch. In addition, the -1 branch is a diode to prevent erroneous reading, (
6 (19 is a manual switch. Also, the states of the relay contacts shown in FIGS. 2 and 3 are all when the relay is not energized.

Next, FIGS. 4 and 6 are flowcharts showing the operation of the microprocessor sensor (to), and are as follows. However, this flowchart only shows a part of the operation of the air conditioner, and does not show all the operations. First, the cooling operation (if the heating operation selection switch is set to heating operation, 6. Reset & Start) processing is performed.

This is a start process by turning on the power, etc., and the air conditioner is maintained in a stopped state after the process is performed.

Furthermore, even when the relay wire is energized and the normally closed contact wire opens,
The air conditioner is reset in this way and becomes stopped.

Next, when the operation switch trowel is pressed to start operation, the electric heater (9) (2KW) is energized to improve the start-up of heating operation.

Next, it is determined whether the switch is on or not, and the switch can is turned on.
N and the air conditioner is not operating (stopped), the room temperature (Tin) in the conditioned room is Tin≦To(=3
．． 5 degrees), start energizing the electric heater (A).
The electric heater (T) is kept energized until Tin≧'L (=5.5 degrees)''.The values of T, T, are not limited to these, and may vary depending on the surrounding conditions. It may also be set arbitrarily.At this time, it is necessary to set an appropriate differential width as Tt>'ro'.

Next, if the switch can is OFF or the air conditioner is running, read the room temperature set value (Tll) set with the slide switch (B). At this time, if the normally open contact of the relay wire) is ON Using the conversion diagram in Figure 5, the value of T is converted to 'r
, = F (Ts)", or if the normally open contact (to) is OFF, directly store the value of T, and based on this value (T,), the compressor (1) , electric heater (9)
, (g) to control the operation or energization. That is, the outside temperature (Tout) is ' Tout 4 T2 (=-1,6
7 degrees), heat pump operation by the compressor (1) and heating operation by the electric heater (9) are performed.
If out≧Tt' is not satisfied, the compressor (1) is maintained in a stopped state, and only heating operation is performed using the electric heater (9) and αQ. At this time, especially the electric heater (9) starts to be energized when the room temperature (Tin) is Tin≦T, -1".
It has a differential in which power is cut off when in≧TIl''.In addition, when the compressor (1) is ON-OFF
In order to prevent chattering due to
A differential may be provided at a temperature at which the switching occurs.

In the above explanation, the compressor (1), electric heater (9)
, (A) are actually operated or energized by the terminals (D8), (Di 1 ), (Di2) of the microprocessor.
When the output becomes ground level, the relay (to), (to),
(B) is energized, and its normally open contact piece (B), -1θ F, is closed. Furthermore, once the compressor (1) and the electric heater (9) are turned on, they remain on until they are set to the off state.

Next, during cooling operation when the four-way valve (2) is switched in the opposite direction to the state shown in Figure 1, when operation is started, the room temperature set value (T, ) set with the slide switch is first read. , at this time, if the normally open contact of the relay wire is ON, the value of Tll is converted to T,=G-('r,)'' using the conversion diagram in Figure 7, and the value is then set to normally open. If the contact is OFF, the value of TI! is directly memorized, and the compressor (1) is activated based on this value (T,).
operation becomes ON state when Tin≧T8'', and 'Tin(
At this time, a differential is provided at the temperature at which the compressor (1) switches from 0N to OFF to prevent chattering from 0N to OFF of the compressor (1). is also good.

Figure 3 is an electrical circuit diagram of the power section connected by ■ of the terminal in Figure 2. The side in the figure is the power transformer, (varistor for 6-pulse massage absorption, and σ0 to υ2 are the protective currents, respectively. These are a fuse or temperature fuse, a main switch for the σ4 house air conditioner, and a σ multiplied AC commercial power source.Other components are the same as those described above, and will therefore be omitted.

When the air conditioner configured as described above is operated, the air conditioner is operated under conditions as shown in FIG. 8 depending on the outside air temperature (Tout) and the indoor temperature (Tin).

If the outside temperature (Tout) is "Tollj 4'f," the compressor (1) is turned off and the electric heaters (9) and (2
) heating operation is performed. After this “Tout≦T
,? The room temperature (Tin) rises as it remains at °'Tin≧
When the temperature reaches "T", the electric heaters (9) and (g) turn off.Hereinafter, heating operation by the electric heaters (9) and (a) is performed until "Tout" reaches T2.In this way, When the outside air temperature is low and sufficient heat pump operation cannot be maintained by the refrigeration cycle (cycle), the heat pump operation is stopped, and the outside air temperature (T out ) rises and To
If ut>T2'', heating operation by heat pump operation can be sufficiently performed, and therefore, the heating operation is switched to operation of compressor (1) and energization of electric heater (9).

In addition, when the air conditioner is not operating, the temperature inside the conditioned room (Tout) decreases as the outside air temperature (Tout) decreases.
If the TiH4T'11'' is low and the switch is in the ON state, the electric heater (t) is automatically turned on.
is energized, and the heating operation is performed until Tin≧T1''. This can prevent the water supply from freezing or the door from freezing due to a drop in the temperature of the harmonized guide.

In addition, a remote control panel separated from the main body of the air conditioner (a)
When the manual switch (c) is operated from a distance, the relay wire is energized and the normally open contact (to) is closed, and at the same time the light-emitting element lights up. When the normally open contact piece (to) closes, the room temperature set value (T, ) is set based on the flowchart in Figure 4.
T, ”F (Ts)”. In other words, the setting range of the room temperature setting value ('rII) is 16≦'I', 42
By changing from 7" to 194T or 424", heating operation can be performed without overheating or insufficient capacity.

Further, when the changeover switch (2) is operated, the relay wire is energized, the normally closed contact wire is opened, and the power supply to the microprocessor (to) is cut off. When the power is supplied again, the microprocessor (to) performs the process of 6 "RESET &START" 9 based on the flowchart of FIG.

That is, the microprocessor (to) is set 6,
The air conditioner is in a stopped state.

In addition, defrosting operation during heating operation is performed using the outdoor heat exchanger (7
) is detected by a temperature sensor 1531, and defrosting is started when the temperature change of this outdoor heat exchanger (7) reaches a certain condition. Regarding the prevention of cold air, a general method is used in which the blower Ql) is stopped for a certain period of time based on the temperature of the indoor heat exchanger (3). Control of the blowers (b) and (2) is performed based on the setting value of the slide switch 59 or the state of the compressor (1), electric heater (9), and gradient.

(F) Effects of the Invention As described above, the present invention provides an air conditioner having a heat pump cycle in which a compressor, a condenser, a pressure reducing device, and an evaporator are sequentially connected in a ring through refrigerant piping. An electric heater is provided for the air conditioner, and if the room temperature in the conditioned room falls below a predetermined value when the air conditioner is stopped, the electric heater is used to heat or operate the heating operation.
Even if the room temperature in the conditioned room drops when the air conditioner stops operating, the electric heater automatically warms or heats the room.
It is possible to prevent damage caused by freezing of doors and windows or freezing of water pipes caused by a drop in room temperature. Furthermore, by setting a switch and changing a predetermined value, the lowest room temperature that matches the conditions of the room to be conditioned can be maintained, and unnecessary operation can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an air conditioner used as an embodiment of the present invention.
Figure 2 is an electric circuit diagram used to control the air conditioner shown in Figure 1, Figure 3 is an electric circuit diagram used to control the air conditioner also shown in Figure 1, and Figure 4 is the electric circuit diagram used to control the air conditioner shown in Figure 2. FIG. 5 is a conversion diagram showing the relationship between T,l and F(T,), and FIG. 6 is a flow chart showing the operation of the microprocessor shown in FIG. 2 during heating operation. A flowchart diagram showing the operation during cooling operation, FIG. 7 is T,
FIG. 8 is an explanatory diagram showing the operation or energization state of the compressor and the first and second electric heaters when the embodiment of the present invention is used. (1)...Compressor, (3)...Indoor heat exchanger,
(5), (6)...pressure reducing device, (7)...outdoor heat exchanger, (9)...first electric heater, (g)
...Second electric heater. Applicant Sanyo Electric Co., Ltd. and one other representative Patent attorney Masao Sano O 115 Figure 7 Figure 11 ↑ - - + 7aut T!

Claims (1)

[Claims] (1) In an air conditioner that has a heat pump cycle configured by sequentially connecting a compressor, condenser, pressure reducing device, and evaporator in a ring with refrigerant piping, an electric heater for an auxiliary heat source is provided in the condenser, and the air conditioner 1. A control method for an air conditioner, characterized in that when the room temperature of the conditioned room falls below a predetermined value when the operation of the air conditioner is stopped, the room to be conditioned is warmed or heated by an electric heater.