In cooling technique from day to day news appear, be it on the side of the cooling process or working substances used in the process. To obtain a cooling effect regulation and control are required. The imperative of our time is increase efficiency of the cooling system, and all this is made possible for us using regulation and control devices. In addition to the devices described in refrigeration systems a number of other devices (regulators) which are an integral part of every newer system also apply. Thermostats are installed in large refrigeration compressors to protect the compressor from overheating of the lubricating oil, bearings, cylinder walls and other. Thermostats are installed in the compressor electric motors for protection against overheating of coils and bearings. These devices exclude the compressor or compressor motor from operation when the temperature reaches a dangerous value. Differential pressure switches are used to dissolve the frost from the evaporator. They measure the drop in air pressure as it flows through and when that pressure becomes high due to the build-up of frost they turn on the dissolution system. All devices discussed above, each in its segment are necessary because of its advantages in maintenance technology, economy and functionality of the system. Convenience of installation of devices for regulation and control of cooling system are multiple: more rational and safer operation of the device, facilitated monitoring and control, maintenance at the right time, more efficient operation, use your device more efficiently, more specifically maintaining the given parameters, reducing usage costs, , easier detection and troubleshooting, resistance of the refrigeration unit and extended system life. From all the above we can see that the most important task of regulation and control devices is to maintain or resize the following sizes by default. Those are:temperature of the cooled space, humidity of air in cooling rooms, the compressor’s ability to fulfil the required requirements, condensation pressure in the condenser, evaporator efficiency, coolant temperature on the suction side of the compressor, compressor lubrication oil quality and amounts of regulated parameters in the refrigeration system.