A refrigeration system (10; 110), comprising: a compressor (20; 120) driven by a power source (30; 130), the compressor having a compressor outlet (42; 142) and a compressor inlet (40; 140); a condenser (22; 122) having a condenser inlet (50; 150), fluidly connected to the compressor outlet, and a condenser outlet (52; 152); an evaporator (24; 124) having an evaporator inlet (60; 160), fluidly connected to the condenser outlet through a first valve (66; 166) movable between an open position and a closed position, and a evaporator outlet (62; 162) fluidly connected to the compressor inlet (40; 140); a leak sensor (82; 182) arranged to provide a signal indicative of a refrigerant; a controller in communication with the first valve (66; 166) and the compressor, the controller being arranged to receive the signal and programmed to command the first valve (66;166) to move towards the closed position, responsive to the signal being indicative of the refrigerant; and a second valve (78; 176) fluidly connecting the evaporator outlet (62; 162) and the compressor inlet (40; 140), the second valve (78; 176) being moveable between an open position and a closed position; wherein the controller is further programmed to operate the compressor such that refrigerant within the evaporator is directed towards the compressor until a suction pressure measurement proximate an inlet of the compressor is less than an ambient pressure; characterized in that the controller (80; 180) is further programmed to command the second valve (78; 176) to move towards the closed position when the suction pressure measurement proximate an inlet (40; 140) of the compressor is less than an ambient pressure. a compressor (20; 120) driven by a power source (30; 130), the compressor having a compressor outlet (42; 142) and a compressor inlet (40; 140); a condenser (22; 122) having a condenser inlet (50; 150), fluidly connected to the compressor outlet, and a condenser outlet (52; 152); an evaporator (24; 124) having an evaporator inlet (60; 160), fluidly connected to the condenser outlet through a first valve (66; 166) movable between an open position and a closed position, and a evaporator outlet (62; 162) fluidly connected to the compressor inlet (40; 140); a leak sensor (82; 182) arranged to provide a signal indicative of a refrigerant; a controller in communication with the first valve (66; 166) and the compressor, the controller being arranged to receive the signal and programmed to command the first valve (66;166) to move towards the closed position, responsive to the signal being indicative of the refrigerant; and a second valve (78; 176) fluidly connecting the evaporator outlet (62; 162) and the compressor inlet (40; 140), the second valve (78; 176) being moveable between an open position and a closed position; wherein the controller is further programmed to operate the compressor such that refrigerant within the evaporator is directed towards the compressor until a suction pressure measurement proximate an inlet of the compressor is less than an ambient pressure; characterized in that the controller (80; 180) is further programmed to command the second valve (78; 176) to move towards the closed position when the suction pressure measurement proximate an inlet (40; 140) of the compressor is less than an ambient pressure.