Bedienungsanleitung A.O. Smith BFM80 (Seite 15 von 74) (Englisch)

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Instruction manual BFM 15

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2.4.4 Flame probe

To ensure that no gas can flow when there is no combustion, the water heater

is fitted with a flame probe (21). The burner control uses the ionisation-detecting

properties of this probe for flame detection. The burner control closes the gas

valve the instant it determines that there is a gas flow but no flame is present.

2.5 Safety of the

installation

In addition to the appliance's standard built-in safety monitoring, the appliance

must also be protected by an expansion vessel, expansion valve, pressure

reducing valve, non-return valve and a T&P valve.

The use of an expansion vessel, expansion valve and/or pressure reducing

valve depends on the type of installation: unvented or vented.

2.5.1 Unvented installation

With an unvented installation, an expansion valve valve and expansion vessel

prevent the buildup of excessive pressure in the tank. This prevents damage

being caused to the enamelled coating (in the appliance) or to the tank. A non-

return valve prevents excessive pressure buildup in the water supply system.

This valve also prevents water from flowing backwards from the tank into the

cold water supply system. The pressure reducing valve protects the installation

against an excessively high water supply pressure (> 8 bar). These components

are fitted to the cold water pipe (3.6 "

Water connections, Vented").

2.5.2 Vented installation

With a vented installation, excess pressure is taken up by the open cold water

head tank. The height of the head tank determines the working pressure in the

water heater, which may not exceed 8 bar. The installation must also be fitted

with a vent pipe from the hot water pipe, that opens into the cold water tank.

Ideally, the vent pipe should discharge into a separate tundish/drain or

otherwise to the open cold water head tank. The water heater should also be

fitted on the hot water side with a stop valve (3.7.3 "

Hot water side").

2.5.3 T&P valve

A T&P valve is only mandatory in an unvented installation. However, A.O. Smith

also recommends the use of a T&P valve in vented installations.

A T&P (Temperature and Pressure Relief) valve monitors the pressure in the

tank and the water temperature at the top of the tank. If the pressure in the tank

becomes excessive (> 10 bar) or the water temperature is too high (> 97 °C),

the valve will open. The hot water can now flow out of the tank. Because the

appliance is under water supply pressure, cold water will automatically flow into

the tank. The valve remains open until the unsafe situation has been rectified.

The appliance is fitted standard with a connecting point for a T&P

valve (3.7.3 "

Hot water side").

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