JPH01312366A - Method for controlling coolant heating type cooling and heating device - Google Patents

Abstract

PURPOSE:To prevent a stoppage in operation of an entire equipment from being generated more than required and improve a durability of the equipment by a method wherein in case that the number of times of stoppages of combustion in a burner reaches a predetermined number of times, a coolant recovering operation is carried out and in turn in case that the number of times of stoppage exceeds the predetermined number of times, a combustion operation of the burner is stopped. CONSTITUTION:In case that the number of times of stoppage of combustion reaches a predetermined number of times (t times), a coolant recovering operation is carried out. That is, the operation is carried out while a four-way changing-over valve 2 is in a heating mode and a two-way valve 10 is in a closed state and then the coolant stayed within an outdoor heat exchanger 3 is recovered into a heating circuit. In turn, in case that an indoor temperature exceeds a set temperature, it is judged that a heating operation is normal operating condition and then the number of times of stoppage of combustion is reset to 0. After this operation, control over ON or OFF of a compressor 1 and a coolant heater 11 are carried out through a comparison between an indoor air temperature and an indoor air set temperature and the indoor air temperature is controlled. In addition, in case that the number of times of stoppage of combustion exceeds the predetermined number of times (6 times), operation of an entire equipment is stopped.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a method for controlling a refrigerant heating type air conditioner.

(Prior art) Fig. 2 is a diagram showing a refrigeration cycle, in which a compressor 1 is connected to an outdoor heat exchanger 3 and a pressure reducing device 4 via a four-way switching valve 2.
, a check valve 5, an expansion valve 6, and an indoor heat exchanger 7 are sequentially connected in an annular manner. Note that the reverse valve 5 is provided so that the flow direction of the refrigerant during cooling is the forward direction. Further, a valve 8 is provided between the four-way switching valve 2 and the suction side of the compressor 1 . Further, a heating pipe line 9 is branched from between the reverse valve 5 and the expansion valve 6, and is connected to the compressor 1 on the downstream side of the check valve 8 via a two-way valve 10 and a refrigerant heater 11.
connected to the suction side of the A burner 12 is provided near the refrigerant heater 11.

Furthermore, a refrigerant heater population sensor 13 and a refrigerant heater output sensor 14 are installed at the inlet and outlet of the refrigerant heater 11, respectively, to measure the refrigerant temperature at the inlet and outlet of the refrigerant heater 11. are doing. Furthermore, a room temperature sensor 15 is provided at the suction port of the indoor heat exchanger 7 to measure the indoor temperature.

During cooling operation, the two-way valve 10 is closed and the refrigerant discharged from the compressor 1 is sent to the outdoor heat exchanger 3 via the four-way switching valve 2, as shown by the broken line arrow in the figure. After being condensed there, the pressure is reduced by the pressure reducing device 4 and the expansion valve 6, and the air flows into the indoor heat exchanger 7, where it expands to perform an indoor cooling action, and then returns to the compressor 1.

In addition, during heating operation, the two-way valve 10 is opened, and the refrigerant discharged from the compressor 1 is sent to the indoor heat exchanger 7 via the four-way switching valve 2, as shown by the solid arrow in the figure. ,
There, the heat is radiated to heat the room, and then the refrigerant passes through the heating pipe 9 and is heated by the burner 12 in the refrigerant heater 11, and then flows back to the compressor 1.

However, during such heating operation, if the refrigerant circulation amount decreases below the required amount, the refrigerant heater 1
There was a problem in that the durability of the refrigerant heater 11 deteriorated due to abnormal overheating.

Therefore, the combustion of the burner 12 is controlled based on the refrigerant temperature at the outlet of the refrigerant heater 11, which is measured by a refrigerant heater outlet sensor 14 provided on the exit side of the refrigerant heater 11.

FIG. 3 is an explanatory diagram of an example of combustion control as described above. The curve in the figure shows the time change in the refrigerant temperature TEO at the outlet of the refrigerant heater 11 measured by the refrigerant heater outlet sensor 14.
EO increases. Then, when this TEO reaches a preset abnormal temperature TI (point A in the figure), combustion in the burner 12 is stopped. Along with this, TEO begins to fall, and when it reaches the reburning temperature T2 (point B in the figure), combustion in the burner 12 is started and the heater is automatically reset.

On the other hand, the number of times this combustion is stopped is measured, and various controls are performed according to this number of times. In order to prevent the durability of the equipment from decreasing due to repeated abnormal overheating, when this number of times reaches a certain number, the entire heating system is stopped and prevented from automatically restarting. ing.

(Problem to be Solved by the Invention) However, even if abnormal overheating occurs in the refrigerant heater, even if the heating operation returns to normal operation immediately thereafter, the number of combustion stoppages before normal operation is recorded as is. Then, when abnormal overheating occurs, the number of combustion stops due to it will be
Since this is added to the number of previous combustion shutdowns, there may be a pointless shutdown of the entire equipment. Furthermore, if the amount of refrigerant circulated is insufficient due to slow leakage of refrigerant at four-way switching valves and check valves, abnormal overheating frequently occurs, causing repeated burner reburning and equipment to easily stop completely. There are problems such as storage.

The present invention was made in view of the above-mentioned problems.
It is an object of the present invention to provide a control method for a refrigerant heating/cooling/heating machine that prevents the entire device from being stopped more than necessary and improves the durability of the device.

[Structure of the invention]

(Means for Solving the Problems) The present invention measures the refrigerant temperature on the outlet side of a refrigerant heater, compares this outlet side refrigerant temperature with an abnormal temperature setting value of the refrigerant heater, and stops combustion in the burner. In a method for controlling a refrigerant-heated air conditioner/heater that controls the combustion of a burner, the number of times the combustion of the burner stops due to the refrigerant temperature rising above the abnormal temperature set value is measured, and the combustion control of the burner is performed according to the number of times the burner stops burning. In addition to changing the method, if the indoor temperature after the burner stops combustion is higher than the preset temperature, the number of stops is reset to 0, and the refrigerant is recovered when the number of stops reaches the specified number. The burner is characterized in that the combustion operation of the burner is stopped when the number of stops exceeds a specified number of times during operation.

(Function) At the start of heating operation or during heating operation, if the indoor temperature is lower than the indoor set temperature, combustion of the burner starts, but at this time abnormal overheating of the refrigerant heater occurs, and the refrigerant heater outlet side When the refrigerant temperature exceeds the abnormal temperature setting value, combustion of the burner is stopped, and the number of times combustion is stopped is counted. If the number of combustion stops is less than the preset number of times, when the refrigerant temperature on the outlet side of the refrigerant heater falls below the preset reburning temperature, the indoor temperature and indoor setting will be reset again. If the indoor temperature is below the set temperature, the burner is re-combusted, and this process is repeated thereafter. On the other hand, if the number of combustion stops is equal to the predetermined number of times, the refrigerant recovery operation is performed, and then the indoor temperature and the indoor set temperature are compared again. Further, when the number of times combustion is stopped exceeds the predetermined number of times, the entire device is stopped.

On the other hand, if the indoor temperature is above the indoor set temperature when the refrigerant temperature drops below the reburning temperature after the burner stops burning,
In other words, if heating is performed as specified,
The number of combustion stops is reset to 0.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

The configuration of the refrigerant-heated air-conditioner according to the present invention is similar to that shown in FIG. 2, and detailed explanation thereof will be omitted.

FIG. 1 shows a flowchart of the operation of the air conditioner according to the present invention. When heating operation starts (A)
, the number n of combustion stops due to abnormal overheating of the burner 12 is set to O (B). Next, the indoor temperature TA measured by the room temperature sensor 15 is compared with the preset indoor temperature T8 (C), and if TA is less than Ts, the combustion power of the burner 12 is started (D), After that, the refrigerant heating type output sensor 14
The refrigerant temperature TE at the outlet of the refrigerant heater 11 measured at
0 and a preset abnormal temperature setting value T1 (E). Here, if TEO≧T1, that is, if it is determined that the refrigerant heater 11 has abnormally overheated, the combustion of the burner 12 is stopped (F), and the number of times n of combustion stops is counted (G). Therefore, if the indoor temperature is still below the set temperature when the refrigerant temperature becomes below the reburning temperature T2, the burner 2 is re-ignited, and the same operation is repeated thereafter. That is, in G, it is determined whether the calculated new number of times n of combustion stops has reached a preset number of refrigerant recovery operation starts, for example, 6 times (H).
. Here, if the number of combustion stops n has not reached 6 times, the refrigerant temperature TEO on the outlet side of the refrigerant heater 11 is compared with the preset reburning temperature T
When ≦T2, feedback is sent to C, and the indoor temperature T is again compared with the indoor set temperature T8. If the indoor temperature is below the set temperature, the burner 2 is ignited again and the number of combustion stops is n. This is repeated until a predetermined number of times, that is, six times. Also, in H, the number of combustion stops n is 6
If the limit has been reached, perform refrigerant recovery operation (K)
. That is, the four-way switching valve 2 is in the heating mode, and the two-way valve 1 is in the heating mode.
0 is closed for a certain period of time, and the refrigerant that has accumulated in the outdoor heat exchanger 3 is recovered into the heating circuit.

Thereafter, the indoor temperature T is again compared with the indoor set temperature T8, and it is detected whether the indoor temperature has reached the indoor set temperature at that point (C). Then, when the indoor temperature is equal to or lower than the indoor set temperature, the burner 2 is ignited again.

On the other hand, if the indoor temperature T is equal to or higher than the set temperature Ts, it is determined that the heating operation is in a normal operating state, and the combustion stop count n is reset to 0 (,M). Thereafter, the compressor 1 and the refrigerant heater 11 are turned on and off by comparing the indoor temperature TA and the indoor set temperature T8, and the indoor temperature is controlled. Further, if the number of combustion stops n becomes more than 6 times, the entire device is stopped (L), and the device is inspected.

〔Effect of the invention〕

As described above, even if abnormal overheating occurs in the refrigerant heater, if the indoor temperature is higher than the indoor set temperature, the present invention determines that the heating operation is normal and stops combustion. By resetting the number of times to 0, the number of combustion stops can be measured again from 0, so it is possible to prevent a meaningless stop of the entire device and improve the sustainability of operation. In addition, when the number of times n of combustion stops reaches a preset number, the internally leaked refrigerant can be recovered by performing a refrigerant recovery operation, allowing normal heating operation to be resumed and improving operational sustainability. This has effects such as being able to improve performance.

[Brief explanation of the drawing]

FIG. 1 is a flowchart of the operation of the air conditioner according to the present invention, FIG. 2 is a cycle diagram of the refrigerant heating type air conditioner, and FIG. 3 is an explanatory diagram of conventional combustion control. DESCRIPTION OF SYMBOLS 1... Compressor, 2... Four-way switching valve, 3... Outdoor heat exchanger, 4... Pressure reducing device, 5... Check valve, 6...
・Expansion valve, 7... Indoor heat exchanger, 8... Check valve,
9... Heating pipe line, 10... Two-way valve, 11... Refrigerant heater, 12... Burner, 13... Refrigerant heater population sensor, 14... Refrigerant heater outlet sensor, 15...
Room temperature sensor. Applicant's agent Yuki Sato 1 Figure

Claims (1)

[Claims] A refrigerant-heating air conditioner/heater that measures the refrigerant temperature on the outlet side of the refrigerant heater and compares the refrigerant temperature on the outlet side with the abnormal temperature setting value of the refrigerant heater to control burner combustion to stop combustion of the burner. In the control method, the number of times the burner combustion stops due to the refrigerant temperature rising above the abnormal temperature set value is measured, and the burner combustion control method is changed according to the number of stops, and the burner combustion control method is changed according to the number of stops. If the indoor temperature is higher than the preset temperature, the number of stops is reset to 0, and when the number of stops reaches the specified number, refrigerant recovery operation is performed, and the number of stops exceeds the specified number of times. A control method for a refrigerant-heated air-conditioning/heating machine, characterized by stopping the combustion operation of a burner when the rotation occurs.