Bedienungsanleitung A.O. Smith ADM 135 (Seite 12 von 64) (Englisch)

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Working principle of the appliance

12 Instruction manual ADM

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

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.

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