JPH04155140A - Control method of air conditioning system - Google Patents

Abstract

PURPOSE:To surely stop refrigerating cycle operation at the outside temperature operable limit, and prevent a decrease in the heating capacity by switching to an alternative energy source such as a boiler, before the refrigerating cycle is stopped, by a method wherein a controller of the refrigerating cycle is com posed of combinations of temperature detectors, control circuits and relays. CONSTITUTION:A low outside temperature control circuit consists of an outside temperature thermistor THM2 1, comparators 2 and 3, transistors Q1 6, and Q2 9, relays RY1 4 and RY2 7, diodes D1 5 and D2 8, a b-contact 10 of the relay RY1 and a c-contact 11 of the relay RY2 The relay RY1 becomes ON when the outside temperature reaches T1, the b-contact 10 is opened, a compressor magnetic contactor 13 is opened and the refrigerating cycle operation is stopped. The relay RY1 becomes OFF when the outside temperature reaches T1+alpha, the b-contact 10 is closed, the compressor magnetic contactor 13 is energized, and the refrigerating cycle operation is re-started. The relay RY2 becomes ON when the outside temperature reaches T2, the c-contact 11 and a boiler start relay 14 are connected and a boiler is started. Time relay RY2 becomes OFF when the outside temperature reaches T2+beta, and the boiler is stopped.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is directed to a heating air conditioner that combines automatic heating operation stop control in response to a drop in outside temperature and advance switching control to an alternative energy source. Regarding.

[Conventional technology]

Conventional air conditioners use an inverter or the like to increase the operating frequency of the compressor based on various temperature data under conditions where the heating load is insufficient as described in JP-A-2-25653 or JP-A-1-196445 to ensure heating capacity. control was common.

[Problem to be solved by the invention]

In the case of conventional heat pump type air conditioners ■ As the outside temperature decreases, the heating capacity also decreases, the EER drops to nearly 1, and the benefits of the heat pump disappear.

■ When operating at low outside temperatures, the compressor suction pressure (Ps) decreases, causing liquid to return to the compressor, which in turn becomes the cause of compressor failure.

■In the case of heating operation when the outside temperature is low, it is still necessary to defrost the frost that has formed on the outside odor exchanger, and during that time the heating capacity further decreases due to the defrosting cycle.
During that time, there are always times when the cold air blows makes you extremely uncomfortable.

■ Since the heat capacity of the boiler side is generally large, there is a cold period of several tens of minutes when the air conditioner is stopped and there is no way to restart the boiler side.

There were other problems. In particular, problem (2) was a big problem in cold winter C heating.

[Means to solve the problem]

Considering the cycle characteristics of the air conditioner, it is possible to set an outside temperature limit, which can be called an operating limit, so an outside air temperature check device is installed and combined with a printed circuit board that has a built-in comparator that compares and calculates the outside air temperature and the set temperature. As a result, when a certain set temperature T2 is reached, the alarm buzzer or alternative energy source U-ray RY2 is turned on, and the alarm buzzer or alternative energy source circuit is operated by the operation of the relay RY. When the set temperature T8 is reached, the compressor operation stop relay RY is turned on, and the operation of the compressor, that is, the refrigeration cycle is stopped by the operation of the relay RY.

Relay RY1 is connected in series to a contact AR12 of the refrigeration cycle protection circuit relay, and is connected to the compressor magnetic contactor CMC1.
The circuit is directly connected to 3, and the relay -RY is,
Alarm buzzer relay coil and boiler drive relay coil 14
This is a circuit directly connected to the circuit.

Using 2 comparators 2.3, 0N- of the refrigeration cycle
OFF operation and 0N- of alternative energy source circuits such as boilers
The OFF operation is made independent.

[Effect]

The outside temperature inspection mechanism transmits outside temperature information to the comparator using a thermistor or the like.

Two comparators (2, 3) compare a predetermined set temperature and the outside temperature. In this case, two comparators are used to determine the switching temperature T for alternative energy sources such as boilers.
2 and the case where the refrigeration cycle is 0N-OFF operating temperature T1. Controls RY1. As a result, by operating an alternative energy source such as a boiler before the refrigeration cycle is stopped, the boiler, which has a large heat capacity, warms up and secures the time constant necessary to contribute to space heating, as well as heating the refrigeration cycle at low outside temperatures. The aim is to compensate for the decrease in capacity with the capacity of boilers, etc.

Note that the signals I and J from the two comparators are transmitted to the transistors Q, , Q, and the switching operations of the transistors operate the relays RY□ and RY.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 shows an example of the low outside air control circuit of the present invention.
．． Comparators 2, 3. Transistor (Q,,Q,
)6,9. Relay (RYL) 4° (RY,)7. Diode (D,)s, (D,)8. B contact 10 of relay RY1. Consists of C contact 11 of relay RYt. FIG. 2 shows a protection device 18 for six refrigeration cycles showing an operating circuit diagram to which the low outside air control circuit of the present invention is applied. De-Isa board 17.
Printed circuit board (PCB) with built-in comparator 15
．． Compressor magnetic contactor (CMC) 13 and auxiliary relay (A
R) Consists of 16. Figure 3 shows relay RY construction and RY2
6 Relay RY engineering with outside temperature detection shows the operating characteristics of
The purpose is to stop the refrigeration cycle operation, and as shown in Figure 3, when the outside temperature reaches T□, the relay RY turns ON.
However, when the b contact 1o is disconnected, the compressor electromagnetic contactor 13 is disconnected and the refrigeration cycle operation is stopped. Further, when the outside temperature reaches T + α, the relay RY1 is turned off, the b contact 10 is closed, and the compressor electromagnetic contactor coil 13 is energized to restart the refrigeration cycle operation. Relay RY is used to issue an alarm when the outside temperature reaches T2 and to start operation on the alternative energy source side. In other words, when the outside temperature reaches T2, relay RY2 switches to O.
If the C contact 11 and the boiler starting relay 14 are connected in series, the C contact 11 closes and the boiler starts operating. When the outside air temperature reaches T2+β, relay RY2 is turned off and boiler operation is stopped.

In the actual operation circuit, as shown in Figure 2, the auxiliary relay AR
, the protection circuit 18 and the a contact 17 of the defrosting de-icer are connected in series with the coil 16 of , and the a contact 12 of the auxiliary relay AR and the low outside air control relay RY are connected in series with the compressor electromagnetic contactor coil 13. The B contact of the machine is connected. The key point of the present invention is that in addition to controlling the operation of the refrigeration cycle to stop at this low outside temperature, there is also a control circuit that uses a relay RY to start operation of an alternative energy source such as a boiler when the outside temperature reaches T2. There is a particular thing. In other words, using the example of heating operation, generally when operating near the operating limit,
Energy efficiency is also usually extremely low, and as mentioned above, under such conditions, it is difficult to generate superheat on the compressor inlet side, resulting in liquid return operation, which significantly reduces product reliability. Therefore, when the outside air temperature falls below a certain set temperature T2, the refrigeration cycle operation is stopped by the relay RY. Before the heating operation is stopped, if the outside air temperature falls below a certain set temperature T2, the relay RY starts operating the alternative energy source such as the boiler (T1 goes down). The set temperature T2 is set higher than the set temperature T1 in consideration of the large heat capacity of the boiler.According to the method of the present invention, it is also possible to easily change the set temperature T2 etc. using a volume or the like. It is also possible to pursue detailed comfort by changing the set temperature T2 according to the combination of air conditioner and boiler.

〔Effect of the invention〕

According to the present invention, (1) Since the operation of the refrigeration cycle is reliably stopped at the operating limit of the outside temperature, the degree of liquid bank is small and the product reliability is high.

(2) Since the refrigeration cycle is switched to an alternative energy source such as a boiler before stopping, there is no significant decrease in heating capacity.

(3) Since the refrigeration cycle is switched to an alternative energy source such as a boiler before the operation is stopped, there is enough time to warm up the boiler tube even with a boiler with a large heat capacity, eliminating discomfort such as a drop in warm air or blowing out cold air when switching. .

(4) Even if there is no alternative energy source such as a boiler, the user can be alerted by an alarm or the like before the refrigeration cycle operation automatically stops when the outside temperature is below the operating limit.

There are effects such as

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an example of the outside air control circuit of the present invention, Fig. 2 is an operation circuit diagram of an example of application of the low outside air control circuit to an air conditioner, and Fig. 3 is a diagram of the outside air control relays RY□ and RY2. FIG. 3 is a diagram showing operating characteristics. 1... Outside air thermistor, 2, 3... Comparator,
4゜7...Control relay, 6,9...Transistor, 1
0゜11... Control relay contact, 13... Electromagnetic contact V for compressor, 1 2 Figure 13/6 No 3 Figure (T+47Z)

Claims (1)

[Claims] 1. In an air conditioner having an outside air temperature detection device, an expansion mechanism, and a compressor, when the outside air temperature reaches a predetermined set temperature T_2, an alarm buzzer is automatically activated or an alternative energy source such as a boiler is activated. The relay on the source side turns ON, and with this ON operation, the alarm buzzer issues an alarm or the power on the alternative energy source side turns ON.
When the outside air temperature returns to T_2+β, the alarm buzzer or the relay on the alternative energy source side is turned OFF, the above power is turned off, and when the outside air temperature reaches the predetermined set temperature T_1, the compressor relay is turned off. ON, automatically turns off the compressor magnetic contactor, stops the refrigeration cycle, and when the outside temperature returns to T_1+α, the compressor relay turns OFF and the compressor restarts.
A method for controlling an air conditioning system, characterized in that a control mechanism for restarting a refrigeration cycle is configured by a combination of a control circuit having an outside temperature detection device, a comparator, and a switching transistor, and a relay.