When working, demanding full discharge of liquid from the cooling system, surely wash out system clear water, blow compressed air for removal of the remains of water, fill with cooling liquid, remove air from system and measure its actual frost resistance.

The system has to provide frost resistance:

– at a temperature to – 25 °C ± 2 for the countries with a frigid and temperate climate;

– at a temperature to – 40 °C ± 2 for the countries with very frigid climate.

NOTE Before starting performance of work, cover electric equipment devices with plastic packages.