A control system for controlling the flow of a liquid refrigerant from a flash tank through a liquid injection line to a first compressor, wherein the first compressor receives refrigerant from a second compressor and sends the refrigerant to a high side heat exchanger configured to remove heat from the refrigerant, wherein the flash tank is configured to store refrigerant from the high side heat exchanger and send a flash gas through a flash gas bypass line coupled to the flash tank to mix with the refrigerant at the first compressor, the control system comprising: a pulse valve configured to be coupled to the liquid injection line; a flash gas bypass valve configured to control the flow of the flash gas through the flash gas bypass line; a temperature sensor configured to measure a temperature of a refrigerant received at the first compressor; a pressure sensor configured to measure a pressure of the refrigerant at the first compressor; and a controller communicatively coupled to the temperature sensor and the pressure sensor, the controller configured to: receive one or more of the measured temperature and the measured pressure; determine that one or more of the measured temperature and the measured pressure exceed a first threshold; determine that a rate of change of one or more of the measured temperature and the measured pressure is above a second threshold; determine that one or more of the measured temperature and the measured pressure is above a third threshold, the third threshold below the first threshold; in response to the determination that one or more of the received temperature and the received pressure exceed the first threshold, actuate the pulse valve to control the flow of a liquid refrigerant from the flash tank through the liquid injection line to mix with the refrigerant at the first compressor; and in response to the determination that the rate of change is above the second threshold and the determination that one or more of the measured temperature and the measured pressure is above the third threshold, initiate closing of the flash gas bypass valve to restrict the flow of flash gas through the flash gas bypass line. a pulse valve configured to be coupled to the liquid injection line; a flash gas bypass valve configured to control the flow of the flash gas through the flash gas bypass line; a temperature sensor configured to measure a temperature of a refrigerant received at the first compressor; a pressure sensor configured to measure a pressure of the refrigerant at the first compressor; and a controller communicatively coupled to the temperature sensor and the pressure sensor, the controller configured to: receive one or more of the measured temperature and the measured pressure; determine that one or more of the measured temperature and the measured pressure exceed a first threshold; determine that a rate of change of one or more of the measured temperature and the measured pressure is above a second threshold; determine that one or more of the measured temperature and the measured pressure is above a third threshold, the third threshold below the first threshold; in response to the determination that one or more of the received temperature and the received pressure exceed the first threshold, actuate the pulse valve to control the flow of a liquid refrigerant from the flash tank through the liquid injection line to mix with the refrigerant at the first compressor; and in response to the determination that the rate of change is above the second threshold and the determination that one or more of the measured temperature and the measured pressure is above the third threshold, initiate closing of the flash gas bypass valve to restrict the flow of flash gas through the flash gas bypass line. receive one or more of the measured temperature and the measured pressure; determine that one or more of the measured temperature and the measured pressure exceed a first threshold; determine that a rate of change of one or more of the measured temperature and the measured pressure is above a second threshold; determine that one or more of the measured temperature and the measured pressure is above a third threshold, the third threshold below the first threshold; in response to the determination that one or more of the received temperature and the received pressure exceed the first threshold, actuate the pulse valve to control the flow of a liquid refrigerant from the flash tank through the liquid injection line to mix with the refrigerant at the first compressor; and in response to the determination that the rate of change is above the second threshold and the determination that one or more of the measured temperature and the measured pressure is above the third threshold, initiate closing of the flash gas bypass valve to restrict the flow of flash gas through the flash gas bypass line.