Control method for preventing direct current variable frequency air conditioner from accidentally shutting down due to low voltage

Abstract

The invention discloses a control method for preventing a direct current variable frequency air conditioner from accidentally shutting down due to low voltage. When the actual temperature of an air-conditioned room is lower than or equal to (the preset temperature -2 DEG C), an indoor ambient temperature sensor transmits the information to an outdoor control system through an indoor unit control system, and the outdoor control system sends out a command to start normal shutdown of an outdoor unit; when a direct current variable frequency compressor decreases in the frequency, the outdoor control system sends out a command to open an air bypass electromagnetic valve; after the direct current variable frequency compressor completes shutdown, the outdoor control system delays for 5 seconds to 20 seconds and sends a normal shutdown command to the indoor unit control system; the indoor unit control system commands an indoor electronic expansion valve to close; the indoor electronic expansion valve starts to close with the open degree reaching 0 pulse and continuously closes for 100 pulses to 300 pulses, so that the complete closedown of the indoor electronic expansion valve can be ensured; and after a delay of 30s to 120s, the air bypass electromagnetic valve is closed. The control method can efficiently prevent the direct current variable frequency air conditioner from accidentally shutting down due to the low voltage after the set temperature is achieved.

Description

technical field [0001] The invention relates to the field of air-conditioning control, in particular to a control method for preventing low-voltage shutdown of a DC frequency conversion air-conditioner. Background technique [0002] One outdoor unit of the DC inverter air conditioner can drive multiple indoor units. When running, one indoor unit can run, or multiple indoor units can run simultaneously. The DC inverter air conditioner includes an indoor unit control system and an outdoor control system. The indoor unit control system is equipped with a temperature sensor that reads the actual temperature of the indoor air-conditioned room. The indoor unit control system is responsible for reading the data of the temperature sensor and sending the information to the outdoor control system. , when the indoor unit control system detects that the actual temperature of the indoor air-conditioning room reaches the set temperature, the indoor unit control system issues an instructio...

AI Technical Summary

Problems solved by technology

The DC inverter air conditioner includes an indoor unit control system and an outdoor control system. The indoor unit control system is equipped with a temperature sensor that reads the actual temperature of the indoor air-conditioned room. The indoor unit control system is responsible for reading the data of the temperature sensor and sending the information to the outdoor control system. , when the indoor unit control system detects that the actual temperature of the indoor air-conditioning room reaches the set temperature, the indoor unit control system issues an instruction to notify the indoor electronic expansion valve to start closing, and the outdoor control system issues a normal shutdown command to the DC inverter compressor to start shutting down, but due to The time it takes for the indoor electronic expansion valve to close completely is shorter than the time it takes for the DC inverter compressor to shut down. , during the period after the electronic expansion valve is completely closed and the DC inverter compressor is shut down, the DC inverter compressor has been running, forming a vacuum effect, causing the air conditioning system to shut down due to low pressure failure

Images