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A.O. Smith ADM 60 Manual

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Working principle of the appliance
12 Instruction manual ADM
2
gis
In this appliance, the cold water enters the bottom of the tank through the cold
water inlet (14). The heat of combustion is conducted to the water by the
combustion chamber (8) and heat exchanger (11). The heated tap water leaves
the tank through the hot water outlet (2). Once the appliance is completely filled
with water, it will constantly be under mains water pressure. When hot water is
drawn from the appliance, it is immediately replenished with cold water.
The gas required for combustion flows via the gas control (16) into the manifold.
Orifices are mounted in the manifold. The gas is injected into the burner bars at
pressure from these orifices (36). The burner bars together form the burner tray.
The injection of gas into the burner bars also draws in the primary air required
for combustion. The narrow opening in the orifice causes the gas flow to
accelerate. This in turn causes a partial vacuum. It is this partial vacuum that
draws in the air (the Venturi effect). Additional air is drawn in through the
opening in the burner tray.
The spark surface igniter (52) ensures ignition of the gas/air mixture. The
thermocouple voltage ensures that the gas control either remains open or
closes.
The flue gases released by this combustion are led through the flue tubes (part
of 11). Flue baffles (part of 11) are mounted in the flue tubes. These retard the
flow of the flue gases, thereby increasing the thermal efficiency of the appliance.
The flue gases are vented from the appliance via the draught diverter (33). For
safety, a flue gas sensor (37) has been fitted to the draught diverter.
A radiation shield/condensation tray (35) is mounted below the burner tray. This
prevents overheating of the floor area below the appliance, as well as serving
as a collection tray for condensation water.
The insulation layer (24) prevents heat loss. The inside of the tank is enamelled
to protect against corrosion. The anodes (9) offer extra protection.
2.3 The appliance's
heating cycle
The entire appliance is regulated by a control thermostat. The control
thermostat monitors the water temperature (T
water
). The appliance's heating
cycle is activated as soon as T
water
falls below the specified threshold value
(T
set
). The value for T
set
can be adjusted using the control thermostat (± 40 °C -
±70°C).
As soon as T
water
drops below T
set
there is a demand, and the control
thermostat closes, causing the main valve on the gas control to open. The gas
mixes with the air it draws along. This mixture is ignited by the pilot burner and
the water is heated. As soon as T
water
exceeds T
set
, demand ceases, the
thermostat opens again, and the heating cycle stops.
The control thermostat has a certain margin both when closing and opening. We
refer to this margin as the hysteresis. The hysteresis cannot be adjusted.
… 12 …


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