A refrigeration system comprising: a compressor having a first stage and a second stage ; a heat rejecting heat exchanger having a fan drawing ambient fluid over the heat rejecting heat exchanger , the heat rejecting heat exchanger including an intercooler and a gas cooler , the intercooler coupled to an outlet of the first stage and the gas cooler coupled to an outlet of the second stage ; a flash tank coupled to an outlet of the gas cooler ; a primary expansion device coupled to an outlet of the flash tank ; a heat absorbing heat exchanger coupled to an outlet of the primary expansion device , an outlet of the heat absorbing heat exchanger coupled to the suction port of the first stage ; and an AC motor configured for driving the first stage and the second stage characterized in that the refrigeration system further comprises: an unload valve coupled to an outlet of the intercooler and a suction port of the first stage ; and a controller for executing a startup process including applying direct current to the AC motor and at least one of: controlling the fan speed to reduce refrigerant heat loss in the heat rejecting heat exchanger ; controlling the unload valve to direct refrigerant from the intercooler to the suction port of the first stage ; and controlling the primary expansion device to restrict flow of refrigerant to the heat absorbing heat exchanger . a compressor having a first stage and a second stage ; a heat rejecting heat exchanger having a fan drawing ambient fluid over the heat rejecting heat exchanger , the heat rejecting heat exchanger including an intercooler and a gas cooler , the intercooler coupled to an outlet of the first stage and the gas cooler coupled to an outlet of the second stage ; a flash tank coupled to an outlet of the gas cooler ; a primary expansion device coupled to an outlet of the flash tank ; a heat absorbing heat exchanger coupled to an outlet of the primary expansion device , an outlet of the heat absorbing heat exchanger coupled to the suction port of the first stage ; and an AC motor configured for driving the first stage and the second stage characterized in that the refrigeration system further comprises: an unload valve coupled to an outlet of the intercooler and a suction port of the first stage ; and a controller for executing a startup process including applying direct current to the AC motor and at least one of: controlling the fan speed to reduce refrigerant heat loss in the heat rejecting heat exchanger ; controlling the unload valve to direct refrigerant from the intercooler to the suction port of the first stage ; and controlling the primary expansion device to restrict flow of refrigerant to the heat absorbing heat exchanger . an unload valve coupled to an outlet of the intercooler and a suction port of the first stage ; and a controller for executing a startup process including applying direct current to the AC motor and at least one of: controlling the fan speed to reduce refrigerant heat loss in the heat rejecting heat exchanger ; controlling the unload valve to direct refrigerant from the intercooler to the suction port of the first stage ; and controlling the primary expansion device to restrict flow of refrigerant to the heat absorbing heat exchanger . controlling the fan speed to reduce refrigerant heat loss in the heat rejecting heat exchanger ; controlling the unload valve to direct refrigerant from the intercooler to the suction port of the first stage ; and controlling the primary expansion device to restrict flow of refrigerant to the heat absorbing heat exchanger . <EOS>