Hoval UltraGas (15-1000), Operating Instructions Manual

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Functional principle of the heating system
4. Functional principle of the heating system
Components Function
Gas heating boiler Burns natural gas safely and environmen-
tally friendly. Extracts the heat from the ge-
nerated combustion gases and transfers
it to the heating water.
Calorifier It holds a reserve of domestic hot water
for consumption (e.g. for showering).
Boiler control unit Controls and monitors the operation of the
heating boiler. Maintains the desired room
temperature optimally and fuel efficiently,
independently of the outside temperature.
Radiator, floor heating Releases the heat of the heating water
into the room.
Heating pump Transports the heating water from the
heating boiler to the radiators and back to
the heating boiler, where it is reheated.
Mixing valve Adjusts the heating flow temperature by
admixing colder return water (water flow-
ing to the radiator) to maintain the desired
room temperature, independently of the
outside temperature.
Pressure gauge Displays the hydraulic pressure in the
heating system.
Air bleeder Eliminates any air to make sure that the
system contains only heating water.
Safety valve Prevents an overpressure in the system.
Diaphragm expansion tank Maintains the pressure in the system con-
stant.