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Manuel Fuel Feeding, ÜKY/W Hot Water Boiler User Manual
temperature in the water. Expansion tanks also fulfill the safety of the system, that is, the pressure
does not rise, and the necessary water support functions for the system.
Open expansion tanks:
At the top of the system, the roof is put on the level difference and works open to the atmosphere. An
expansion tank is placed at a slightly higher point than the highest point of the dispensing system to
collect the expanded water volume. The water that expands in the boiler is stored in the expansion
tank by means of a travel safety pipe. When the water in the installation cools, the water of the
installation is completed by the expansion tank by means of the return safety pipe. As the expansion
tank also opens the system to the atmosphere, it ensures the safety of the system by preventing the
pressure in the heating installation to rise above atmospheric pressure. The venting pipes are opened
from the expansion tank to the atmosphere and the air in the system is discharged. It is recommended
to use separate expansion tanks according to their capacities for each boiler in the installation. That is,
it is not correct to connect the two boilers to a single expansion tank. There are return and return
safety pipes for each boiler and expansion tank. Valves, check valves etc. on these safety pipes. No
fittings such as material should not be installed. Safety pipes must reach the nearest point of the boiler
inlet and outlet by the shortest vertical path. Horizontal movement is only allowed at the level of the
expansion tank and at minimum length.
Expansion tank volumes that must be rated according to the rated boiler capacity
Boiler Power
(kW)
Open Expansion
Volume (lt)
25
50
35
50
45
90
60
90
Open expansion tanks were selected by considering the open expansion volumes of
Ünmak brand and panel radiator in the system.
ÜKY/W boilers must be connected to an installation with an open expansion tank in accordance with
the installation diagram shown below. The circulation pump can be connected to the return or return
line. If the pump is in the boiler return; the open expansion tank must be higher than the discharge
head of the pump.
