HVAC refrigerant charging and relieving systems and methods

A system, comprising:

• a refrigerant circuit configured to circulate a refrigerant;
• a first valve fluidly coupled to the refrigerant circuit;
• a second valve fluidly coupled to the refrigerant circuit;
• a compressor configured to compress the refrigerant to generate a high-pressure portion of the refrigerant circuit;
• an expansion device configured to expand the refrigerant to generate a low-pressure portion, wherein the first valve is disposed at the low-pressure portion of the refrigerant circuit;
• a sensor configured to measure parameters of the refrigerant in the refrigerant circuit;
• a tank fluidly coupled to the refrigerant circuit via the first valve, the second valve, or both;
• and
• control circuitry communicatively coupled to the sensor, the first valve, and the second valve, wherein the control circuitry is configured to:
• detect whether an undercharge condition or an overcharge condition is present in the refrigerant circuit based on the measured parameters;
• in response to detecting the undercharge condition, instruct the first valve to transition to an open position of the first valve to facilitate flow of the refrigerant from the tank to the refrigerant circuit;
• and
• in response to detecting the overcharge condition, instruct the second valve to transition to an open position of the second valve to facilitate flow of the refrigerant from the refrigerant circuit to the tank.

A system, comprising:

• a refrigerant circuit configured to circulate a refrigerant;
• a first valve fluidly coupled to the refrigerant circuit;
• a second valve fluidly coupled to the refrigerant circuit;
• a compressor configured to facilitate circulation of the refrigerant through the refrigerant circuit;
• a sensor configured to measure parameters of the refrigerant in the refrigerant circuit;
• a tank fluidly coupled to the refrigerant circuit via the first valve, the second valve, or both;
• control circuitry communicatively coupled to the sensor, the first valve, and the second valve, wherein the control circuitry is configured to:
• detect whether an undercharge condition or an overcharge condition is present in the refrigerant circuit based on the measured parameters;
• in response to detecting the undercharge condition, instruct the first valve to transition to an open position of the first valve to facilitate flow of the refrigerant from the tank to the refrigerant circuit;
• and
• in response to detecting the overcharge condition, instruct the second valve to transition to an open position of the second valve to facilitate flow of the refrigerant from the refrigerant circuit to the tank;
• and
• a pump configured to pump the refrigerant from the refrigerant circuit into the tank while the second valve is in the open position of the second valve.