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Technical Documentation
Hydraulic circuit.
The hydraulic circuit with relevant control and safety
devices is engaged every time there is a request for
domestic hot water.
Operation.
Drawing at least 2.5 l/min of domestic hot water means
a flow of cold water inside the flow measuring device
(14) and consequent enabling of operation.
Following this, the adjustment circuit ignites the burner.
This way the heat generated by the flame and con-
tained in the fumes produced by combustion is
absorbed by the copper blades of the water-gas
exchanger (3) which in turn transfers the heat to the
water flowing inside.
Exchanger.
This is a water-gas exchanger (1) with pipes and flaps
in copper at the exit of which is positioned the
overheating safety thermostat (2).
It is of the so-called "wet chamber" type because the
lower part (3) around which is wrapped the hot water
outlet pipe (4), represents in fact the combustion
chamber.
NOTE: to maintain the characteristics of efficiency of
the exchanger, we recommend installing a
"polyphosphate dosing" kit if the water is such as to
have characteristics that could create scale on the
pipes (recommended when water hardness exceeds
25 French degrees).
STCS ed 07/02
Technical Documentation
Safety devices and controls.
Flow meter (1).
This is a rotating magnetic sensor fitted at the cold
water flow inlet.
By means of a three-pole connector (2) it is electrically
connected to the adjustment board, allowing this to
measure the flow of water to determine minimum
ignition value (2.5 l/min) and optimise temperature
adjustment.
10 bar safety valve unit (1).
Prevents safety pressure (10 bar) being exceeded in
the hydraulic circuit of the water heater.
It is connected to the cold water inlet pipe.
Inside is a 10 l/min flow limiter (2) and a one way valve
that prevents the return of hot water towards the mains
supply.
5
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