13
7. Non-return valve
A non-return valve fitted behind the fan will prevent recirculation of flue gases from one burner to the other burner
(when this burner is not operating).
8. Heat exchanger
The heat exchanger consists of spirals of stainless steel smooth tube. Through the openings between the spirals the
flue gases are pushed, establishing an optimal heat transfer.
The ends of these spirals are welded with stainless steel nozzles that start at the return connection of the boiler and
end in the supply connection of the boiler.
9. Burner
Both parts of the heat exchanger contain their own burner that consists of a perforated cylinder from stainless steel
with an extra porous layer for protection against high temperatures. This porous layer is a weaving layer; the wires
are made of an alloy with high temperature resistance.
3
TECHNICAL DIMENSIONS OF THE S-CB
+
400 / S-CB
+
550
Connection
Function
Diameter (inch/mm)
A
water flow (outlet)
R 2½ "
B
water return (inlet)
R 2½ "
C
cable input
Ø 22,5 mm
D
combustion air inlet
Ø 180 mm
E
flue terminal
Ø 180 mm *
F
gas connection
R 2 ”
G
condensate discharge hose
Ø 25 mm outer diameter
