Bedienungsanleitung A.O. Smith BFC100 (Seite 15 von 100) (Englisch)

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Instruction manual BFC 15

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2.3 Water heater

operating cycle

The temperature sensor T

(7) measures the water temperature at the top of the

water heater T

top

). This temperature is sent to the controller. As soon as T

lower than the set water temperature (T

set

), the controller registers a "heat

demand". The fan (18) starts running and the gas control valve (16) is opened.

The fan runs at full speed and the gas is mixed with the air in the venturi (30).

This mixture is ignited by the hot surface igniter (20) and the water becomes

heated. As soon as the water temperature approaches T

set

the fan rpm drops

to the partial load speed (this is also referred to as modulating). Once T

rises

above T

set

, the heat demand ends and the controller stops the operating cycle.

When responding to both the start and end of the heat demand, the controller

assumes a certain margin. We refer to this margin as the

hysteresis (12.2 "

Setting the hysteresis").

2.4 Protection for the

water heater

2.4.1 Introduction

The controller monitors the water temperature and ensures safe combustion.

This takes place using:

• the Protection for the water heater

;

• the Gas control valve;

•the Fan

• the Pressure switch;

• the Flame probe.

2.4.2 Water temperature protection

Using temperature sensors T

(7) and T

(13), the controller monitors three

temperatures that are important for safety. The table explains the functioning of

the temperature sensors.

Temperature protection

2.4.3 Gas control valve

The controller opens the gas control valve so that gas can be supplied to the

burner. As a safety measure, the gas control valve has two valves. Both valves

shut off the gas supply.

2.4.4 Fan

The fan (18) provides an optimum air supply when there is a heat demand. As

a safety feature, the fan ensures that any gases present in the combustion

chamber are removed, both before and after combustion. We refer to this as

pre- and post-purge.

The fan speed is continuously monitored by the controller (4). The controller

takes control if the fan rpm varies too much from the value set.

Safety Description

Anti-frost

< 5°C or T

< 5°C)

The frost protection cuts in. The water is heated to 20°C.

Maximum water temperature:

> 88°C or T

> 88°C)

The high-limit safeguard serves to prevent overheating and/or excessive

formation of scale in the appliance. If the high-limit safeguard is activated,

heating is stopped. This causes the water in the tank to cool down. Once the

water has cooled sufficiently (T

< 81°C), the controller resets the appliance.

For extra safety

> 93°C or T

> 93°C)

A lockout error of the water heater controller takes place. The controller must

be manually reset before the appliance can resume operation (8.3 "Error

conditions"). The reset may only be performed if T

< 81°C.

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