4
ATI SP 80, 120, 220, 300, 400 – INSTALLATION INSTRUCTIONS
Sept - 01
1.3 CONSTRUCTIONAL AND OPERATIONAL
DESCRIPTION
The purpose of the appliance is to allow the exchange
of heat between the gas combustion products, burned
in the combustion chamber, and the water held in the
tank.
The combustion is completely sealed inside the
combustion chamber, because the air supply and
exhaust gas outlet are made out of the room where the
appliance is installed. The sealed combustion chamber
is placed at the bottom of the appliance, under the
water tank. On the top there is the flue hood for the
forced draft of flue gases: a fan, placed after the
combustion chamber, assures the exhaust gas outlet
and the right air supply to the burner for the
combustion. Flue pipes which go through the water
tank, carry the air to the combustion chamber and the
exhaust gas back to the flue hood.
FLUE HOOD
The fan situated in the flue hood provides the air
supply and extracts the products of combustion. The
flue hood rotates through 360° for ease of positioning.
If the fan is not operating correctly or the flue pipes are
obstructed, a pressure switch, placed inside the flue
hood, stops the gas supply to the burner.
WATER TANK
It is made of thick sheet steel and assures great
resistance to pressure. The inside is coated with opal
glass (a vitreous coating baked at over 850°).
This allows a high chemical resistance (unassailable
from organically solvents and many other chemical
substances), excellent abrasion resistance (low
friction) and very good thermal stability (the opal glass
on steel resists up to 500°C; moreover frost and cold
have no effects). Moreover this allows a tank’s long-
life and a higher healthy water. Inspection and
cleaning of the tank are allowed by an appropriate
clean our and inspection door.
COMBUSTION CHAMBER
It is situated at the bottom of the appliance, and this is
where the atmospheric burner, ignition and detection
electrodes are housed. The combustion chamber is
completely sealed.
INSTRUMENT CONTROL PANEL
On the instrument control panel there is all that is
required to control and to adjust the normal operating
of the appliance: control thermostat, ON/OFF switch,
lock-out lamp/reset push-button and the thermometer
FLUE SYSTEM KIT (supplied separately)
It assures the connection between the flue hood and
the termination point, and for the air supply to the
burner. The flue kit required must be selected from the
various kits available, according to installation
requirements:
•
horizontal coaxial system, with air supply and flue
outlet through the side wall.
•
vertical coaxial system, with air supply and flue
outlet through the roof.
•
vertical single wall system, with air supply through
the side wall and flue outlet through the roof.
•
horizontal single wall system, with air supply
through the side wall and flue outlet in the chimney.
1.4 CONTROL AND SAFETY DEVICES
MAGNESIUM ANODE (ATI SP 80 & 120 ONLY)
The water heater is protected against metal-to-metal
corrosion by a magnesium anode. This has to be re-
placed each year in order to extend the working life of
the appliance. The anode is placed in the inspection
flange.
CORREX ELECTRONIC ANODE
(ATI 220, 300 & 400 ONLY)
The water heater is protected against metal-to-metal
corrosion by an electronic anode. This requires a per-
manent 230 volt electrical supply in order to give full
protection and extend the working life of the appli-
ance. The anode is fitted in a 3/4" connection in the
clean out and inspection flange.
Picture 2a
Magnesium anode position
On ATI SP 80 & 120
Picture 2b
Correx electronic anode position
on ATI SP 220, 300 & 400
