Ariston NEXT SFT 14 Manuale d'uso - Pagina 9

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3.1. Description of the Appliance

NEXT SFT water heaters are room sealed instantaneous gas
fi red water heaters, with electronic ignition and ionisation
safety devices, they have a modulating burner and are
connected to the mains water supply; they provide domestic
hot water.
Their self-contained combustion chambers with fans for
the intake of external air and the extraction of combustion
products, allow them to operate totally independently from
the room in which they are installed.
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2
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Main components :
1.
FRAME including the bracket for hanging the water
heater .
2.
SEALED CHAMBER BASE, which, together with the
casing, forms the combustion chamber
3.
PRODUCTS EXTRACTION SET which includes the
extractor body, fan, air pressure switch and coaxial outlet
duct Ø 60-100
4.
FAN for expelling the combustion gases to the outside
through the tube Ø60 and to take in air from outside the
chamber
5.
HEATING BODY made of copper
6.
BURNER made of stainless steel which works with
natural gas. Distributor fi tted with injectors.
7.
ELECTRODES for ignition and fl ame sensor which works
by ionisation
8.
GAS VALVE fi tted with two safety valves, manual power
rating selection, automatic power modulation according
to the fl ow of water and gradual progressive lighting of
the burner.
9.
WATER VALVE fi tted with an automatic water fl ow
regulator and with a manual temperature selector
Legend
1.
Flue spigot
18
2.
Combustion hood
3.
Overheat thermostat
4.
Detection electrode
17
5.
P.C.B.
16
6.
Fan
7.
Hot water temperature sensor
8.
Air pressure switch
15
9.
Cold water inlet fi lter
10. Inlet water temperature probe
11. Gas valve
12. Water fl ow switch
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13. Gas collector
14. Spark generator
13
15. Ignition electrode
16. Thermal fuse
12
18. Heat exchanger
11
10
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10. ELECTRICAL POWER SUPPLY AND CONTROL: Supplies
the water heater with 1.5 V from the mains supply at 220-
230 V a.c. Supplies the fan and, through the air pressure
switch, controls the extraction of the combustion
products.
11. ELECTRONIC CIRCUIT for igniting the fl ame and
controlling it by means of ionisation.
12. AIR PRESSURE SWITCH which cuts off the intake of gas to
the burner if waste products are not expelled correctly
13. COAXIAL OUTLET Ø 60-100
14. ELECTRICAL SUPPLY CABLE
15. HEAT EXCHANGER

3. installation

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