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ÜKY/DUO Boiler User Manual
RULES FOR HEATING INSTALLATION
Circulation pump:
A pump with sufficient capacity is
recommended. The capacity of the
required pump is determined by taking
into account the resistance in the
installation. Refer to the wiring
diagrams in the manual to determine
the correct position of the pump in the
system. The pump stage must be
adjusted according to the resistances in
the installation.
In addition to the schematic installation
connection shown in high-capacity
boiler installations, a backup pump
system must be installed. The by-pass line must be connected directly to the spare pump line as a
primary pump. Boiler inlet and outlet lines must be connected with collectors. For open expansion
installations, the head of the pump must be less than the height of the expansion, so that the system
does not make air.
When the circulation pump is installed, the failure of the electrical connections to come down will
eliminate the problem of entering the water into the pump. Perpendicular installation of the shaft
should also be avoided in order to prevent the pump shaft from pressing the housing or the outer
cover during operation.
Expansion tank:
In hot water heating systems, when the water is heated from 10ºC to 90ºC, its volume increases by
3.55% of its initial volume. "Expansion tanks" are used to get this expansion depending on the
temperature in the water. Expansion tanks also fulfill the safety of the system, that is, the pressure
does not rise, and the necessary water supply duties to the system. Since DUO series boilers can also
be loaded manually, an open expansion tank is mandatory.
Open expansion tank systems:
It is placed at the top of the system that is, on the roof, works with a level difference and open to the
atmosphere. The expansion tank is placed at a slightly higher point than the highest point of the
dispensing system to collect the expanding water volume. The water expanding in the boiler is stored
in the expansion tank through the flow safety pipe. When the water in the installation cools, the
reduced water of the installation is completed by the expansion tank through the return safety pipe.
Since the expansion tank opens the system to the atmosphere, it ensures the safety of the system by
preventing the pressure in the heating installation from rising above the atmospheric pressure. Air
