Protokol proverki avr zapolnennij obrazec. That means that you have to press the function key as well. Because if say F2 has also screen brightness as function, it's either that a normal key press triggers F2 and key press plus function key gives you screen brightness control - or vice versa.

High-efficiency energy recovery systems, consisting of several heat exchangers in circuit connect arrangement, require a special internal hydraulic coupling with a maximum part of counter flow. The heat exchanger must be able to drain and vent in the installed position. This particular circuit has been developed by us in 1985 and is produced by more and more manufacturers of heat exchangers. This particular circuit is suitable for staggered and in line arrangement. It was the desire of many manufacturers to be able to acquire an application which can draw this particular circuit. Only 5 input data are needed.

The application calculates the packet size per two tube rows in the depth from the top down, in this example 4/2/2/4/2, and records the circuit. The rear arches are drawn thin and thick front. The pipes with vents and drains are shown in gray.