Patent ID: 7000416

Claim:
A cooling apparatus comprising: a primary refrigerant circulating circuit which allows a primary refrigerant whose temperature is adjusted by a heat exchanger to circulate into an electrode and adjusts a temperature of said electrode, and which has a first check valve for allowing said primary refrigerant to flow into said electrode, a second check valve allowing said primary refrigerant to flow out from said electrode, and a purge valve capable of bringing said primary refrigerant into communication with a purge gas path, a secondary refrigerant circulating circuit which supplies a secondary refrigerant to said heat exchanger to adjust a temperature of said primary refrigerant, and a freezing circuit through which a tertiary refrigerant circulates said heat exchanger being interposed in said secondary refrigerant circulating circuit, said freezing circuit adjusting a temperature of said secondary refrigerant by said tertiary refrigerant, a temperature detector for detecting temperatures of said primary refrigerant and said secondary refrigerant, and a control system for actuating, only when necessary, said freezing circuit in accordance with a detected temperature value of at least one of said primary refrigerant and said secondary refrigerant, wherein the freezing circuit is configured to not operate when the cooling apparatus is in an energy-saving mode.