Metal-Fach SEG BIO 100, Эксплуатационная и техническая документация, Страница: 17 / 54

16
17. Connection of boiler to heating
installation in closed-loop system
(additional option)
(INSTALLER)
ATTENTION!
The central heating system in the open system must meet the requirements set in
the PN-EN 12828:2006 norm- Heating systems in buildings and the PN-EN 303-
5:2012 Solid fuel boilers with manual and automatic feeding.
When installing the boiler in the closed system, it is important to use elements that prevent
overheating, excessive increase of pressure and use the controller of temperature during burning
process.
In the SEG BIO boilers , there is a copper coil that is installed inside the boiler exchanger. The
coil is made from ribbed copper pipe.
Tab. 17.1 Examples of devices enabling heating systems protection
Part Description
STB Safety temperature stop with manual return to start position
Cooling coil
Cooling coil cools the system when the temperature exceeds
97C
BVTS Valve
BVTS valve prevents the flame from returning back into the
solid fuel feeder through flooding the fuel in heightened
temperature situation.
Pressure expansion tank Preventing heightened pressure
Safetly fixtures It includes safety valve, manometer and deaerator
ATTENTION
The boiler installed in the closed system must be equipped with all the safety
devices listed in Tab. 17.1.
ATTENTION!
The cooling coil should be connected to the water system. The power supply cannot
be the pressure tank unit because it needs power supply for its operation.
The exchanger that is installed in the water coat is connected to the cold water cable, that flows
through it only when the thermal valve opens up when it exceeds the given temperature. The water
goes through the exchanger and receives the heat from boiler water coat and then is led to the
sewage system as hot water might damage it.
The exchanger is able to lower the temperature in the water coat by few degrees within several
seconds. If the temperature in the boiler coat drops below the set temperature then the valve cuts
off the water to the exchanger. In this solution, the high quality of the exchanger and valve allows
several consecutive switch off and on of the protection
In the solution with a built in safety coil e.g thermal protection is used (Schematic 17.2).
Schematic 17.1 Safety schematics of the boiler with the cooling coil and thermal protection
The solid fuel boilers with an automatic feeding feature carry very little risk of an uncontrolled
rise in central heating temperature as the amount of the fed fuel is small. Moreover, in case of a
sudden temperature rise, the safety procedure will activate without the user.
If anything goes wrong, the controller will switch off the feeder for 30 sec in order to remove the
ember. If after 2 min from the ember removal, the feeder temperature does not drop, the controller
will try again. After four consecutive trials to reach 85
o C the controller fails to lower the feeder
temperature, the boiler stops and emergency extinguishing will start.