Neptune_GB_Ver.2.0_10/03
3.
Construction
1
2
3
4
5
Heat exchanger
The heat exchanger is the heat generating part of a hot water machine. It consists of a labyrinth-
constructed tube coil, which encloses the combustion chamber. The tube coil is enclosed by a
double container with boiler jacket, bottom and top in a sandwich construction, between which
the pre-heated air is routed into the combustion chamber. An insulating material placed in the
bottom of the heat exchanger makes sure that the inner bottom, among other things, is protected
from superheating.
Water inlet
Air distributor
Flame sensor
Electrodes
Fuel nozzle
Exhaust
Water outlet
Burner tube top plate
Burner tube
Flame tube top part
Flame tube
Inner jacket
Outer jacket
Isolation (firebrick)
Isolation (ceramic fibres)
Mounting plate
Fixation spacer
14.
Note the heat exchanger tube arrangement in the the outer circle where the tube change position
on its way up (1 - 2 - 3 - 4 - 5) to equalize the water temperature.