16
Remeha
Gas 3002 ECO
6. PRINCIPLE OF THE BOILER INSTALLATION
The required combustion air is blown into the air channel
(2)
by the fan
(1)
via a non-return valve.
This valve is installed to prevent accumulated heat from
escaping when the boiler is out of operation.
Standing losses are reduced considerably this way.
The boiler is provided with a number of separate burner
compartments
(see fig. 1, chapter 2)
, each provided with
a curved mixing section
(3)
with gas injection
(4)
.
The combustion air is uniformly distributed over the
various curved mixing sections in the air channel.
The injectors blow the gas radially into the air flow.
This gas injection method ensures proper mixing of air
and gas, thus creating a homogenous mixture.
The curved mixing sections are connected to the distri-
bution chambers
(5)
to distribute the mix evenly across
the burnerhead.
A throttle plate is fitted in the distribution chamber of
the burner compartment on the gas connection side. This
throttle plate has to build up the control pressure for the
gas control block for the gas/air ratio control.
This control ensures optimal combustion under all
circumstances. Furthermore, each mixing chamber is
provided with a distribution plate. This slotted plate
serves to distribute the mixture over the burner
(6)
.
The burners have a metal fibre cover in which a burner
pattern is punched. The gas/air mixture is ignited and
combustion takes place. Premix combustion ensures a
very low NOx emission.
The flue gases then flow through both heat exchangers
(7+8)
and are cooled to a temperature which is only a
few degrees higher than the return water temperature.
If the return water temperatures drop below approxi-
mately 55°C, the flue gases will be cooled down to below
the dew point, i.e. the temperature at which the water
vapour in the flue gases begin to condense.
The heat released by this condensation process (the so-
called latent heat or condensation heat) is transmitted to
the heating water.
The condensate is collected in a collector
(9)
and dis-
charged to the drains via a syphon
(10)
(despatched as
a loose item).
The flue gases are reversed and discharged through the
flue gas discharge pipe
(11)
(included in the supply) to
the flue gas discharge pipe.
Fig. 10 Right side, cross section
