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ÜKY/Duopel Boilers User Manual
RULES FOR HEATING INSTALLATION
Circulation pump:
A pump with sufficient capacity and a pump system is recommended. The capacity
of the required pump is determined taking into account the resistances formed in
the installation. The wiring diagrams given in the manual should be taken as
reference to determine the correct position of the pump in the system. The pump
stage should be adjusted considering the resistance in the installation.
In addition to the schematic installation connection shown in high capacity boiler assemblies, a backup pump
system should be made. By-pass line should be connected directly as backup pump line, primary pump. Boiler
inlet and outlet lines should be connected with collectors. In order to prevent the system from making air, in
open expansion installations, the head of the pump should be less than the height of the expansion.
In the assembly of the circulation pump, the electrical connections not coming down will eliminate the problem
of possible water entering into the pump. Vertical mounting of the shaft should also be avoided to prevent the
pump shaft from pressing on the body or 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 DUOPEL series boilers can also be loaded manually, an open expansion tank
is mandatory.
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 pipes in the system are evacuated by opening the air
pipes to the atmosphere from the expansion tank. It is recommended to use separate expansion tanks for each
boiler in the installation, according to their capacities. So it is not right to connect two boilers to one expansion
tank. There are flow and return safety pipes for each boiler and expansion tank. Valves, check valves etc. on
these safety pipes. No fittings such as material should be installed. The safety pipes should reach the nearest
point of the boiler inlet and outlet from the shortest vertical path. Horizontal movement is permitted only at
the level of the expansion tank and the minimum length.
ÜNMAK DUOPEL series solid fuel boilers must be connected to an installation with an open expansion tank in
accordance with the installation scheme shown below. The circulation pump can be connected on the flow or
return line. In case the pump is at the return of the boiler; open expansion tank should be higher than the head
of the pump.
Warning about water level:
After the first water is pumped into the system, the minimum water level should be marked on the
hydrometer. The water level should be checked daily, and water should be added to the installation when it
falls below the minimum value. Open expansion tank volumes, which should be according to Ünmak boiler
capacities, are given in the table above. Open expansion tanks are selected by assuming Ünmak brand open
expansion volumes and panel radiators in the system.
BOILER
POWER
(kW)
OPEN
EXPANSION
VOLUME (Lt)
25
50
40
90
60
90
80
110
100
210
