Bedienungsanleitung A.O. Smith BFC80 (Seite 16 von 100) (Englisch)

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Working principle of the water heater

16 Instruction manual BFC

gis

2.4.5 Pressure switch

The pressure switch only guarantees the supply of air during pre-purging of the

water heater. If the pressure difference during pre-purging is sufficient, the

pressure switch closes. The table (3.4.2 "General and electrical specifications")

shows the trip point for each water heater.

Note

The trip point of the pressure switch is not adjustable.

2.4.6 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 controller uses this probe to detect the

presence of a flame, by means of ionisation detection. The controller closes the

gas control valve the instant it detects that there is a gas flow but no flame.

2.5 Safety of the

installation

Excessive pressure in the tank can damage the enamelled layer (in the water

heater) or the tank itself. An inlet combination and pressure-reducing valve

prevents this. The inlet combination acts as a stop valve, non-return valve and

overflow valve. If the water mains pressure is too high (3.4.2 "

General and

electrical specifications"), a pressure-reducing valve must be used. Both

components must be fitted in the cold water inlet (3.7 "Vented water

connections").

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 and expansion vessel prevent

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

caused to the enamel coating (in the water heater) or to the tank. A non-return

valve prevents excessive pressure build-up 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 water heater

against excess mains water pressure (3.4.2 "

General and electrical

specifications"). These components are installed in the cold water

inlet (3.7 "

Vented water connections").

2.5.2 Vented installation

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

head tank. The level of the cold water head tank determines the maximum

working pressure (3.4.2 "

General and electrical specifications") in the tank. The

water heater must also be fitted with a vent pipe from the hot water pipe, which

opens into the cold water head tank.

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

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

fitted with a stop valve (3.6.2 "Hot water side") on the hot water side.

2.5.3 T&P valve

A T&P valve is only mandatory in unvented installations. 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 too high (3.4.2 "General and electrical specifications"), the valve will

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

heater is fitted standard with a connection for a T&P valve (3.6.2 "

Hot water

side").

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