Lochinvar CH 100 G CE Installation, Commissioning, User & Maintenance Instructions page 12

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Working principle of the water heater
In this appliance, the cold water enters the bottom of the tank through the cold
water inlet (26). The heat of combustion is conducted to the water by the
combustion chamber (10) and flue tubes (4). The heated tap water leaves the
tank through the hot water outlet (15). 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 appliance has an ignition probe that lights the pilot flame burner (12).
The gas required for combustion flows via the gas control (12) into the manifold.
There are orifices in the manifold. The gas is injected into the burner bars at
pressure from these orifices (29). 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.
When the gas/air mixture starts to flow, it is ignited by the pilot burner.
The flue gases generated by this combustion are led through the flue tubes (4).
Flue baffles (5) are fitted inside the flue tubes. These retard the flow of the flue
gases, thereby increasing the thermal efficiency of the appliance.
The flue gases are exhausted from the appliance via the draught diverter (2).
A radiation shield/condensation tray (11) 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 (6) prevents heat loss. The inside of the tank is enamelled
to protect against corrosion. The anodes (3) offer extra protection.
12 Instruction manual CH