A.O. Smith BFC -100, BFC - 80 service manual Starting and running

Models: BFC - 80 BFC -100

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9

Starting and running

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Once the appliance starts, it will run through the following steps:

1.The water temperature drops below the set temperature of (for example) 65°C. The electronic controller detects a demand and starts the heating cycle.

-The icon is activated.

-The message HEAT DEMAND appears.

a

ON Ê

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HEAT DEMAND

2.Once demand is registered, the fan is started to exhaust any gases that may be present. This phase is called pre-purge and lasts about 15 seconds.

-The icon is activated.

-The message PRE PURGE appears.

a

ON Ê Ê

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PRE PURGE

3.During the pre-purge, the pressure switch closes.

-The icon is activated.

-The message PRESSURE SWITCH appears.

5.After a number of seconds pre-glow, the gas control is opened and ignition takes place.

-The icon is activated.

-The message IGNITION appears.

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ON

Ê

Ê Ê

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IGNITION

 

 

 

 

 

6.After ignition, the flame is detected and the appliance will be running. This means that actual heating has started. The fan speed then increases to the normal working speed, and the pressure switch closes:

-The icon is dimmed.

-The icons and are activated.

-The message RUNNING appears.

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Ê Ê

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RUNNING

 

 

 

 

 

7.When the water is up to temperature, the heat demand drops off and the post-purge starts. This lasts about 25 seconds.

-The icons , and are dimmed.

-The icon is activated.

-The message POST PURGE appears.

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Ê Ê Ê

 

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PRESSURE

SWITCH

 

 

 

4.After some time, the pre-purge ceases and the electronic controller reduces the fan speed to the ignition speed. This is followed by the (pre-)glow of the hot surface igniter.

-The icons and are dimmed

-The icon is activated.

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ON

Ê

Ê

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GLOW PLUG

 

 

 

 

 

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POST PURGE

 

 

 

 

 

8.Following the post-purge, the fan stops and the pressure switch opens:

-The icons and are dimmed.

-The message POST PURGE vanishes.

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ON

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With any subsequent heat demand, the heating cycle will resume from step 1.

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Instruction manual BFC

Page 54
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A.O. Smith BFC -100, BFC - 80 service manual Starting and running

BFC - 80, BFC -100 specifications

A.O. Smith is a renowned name in the water heater industry, and its BFC series, which includes the BFC-100 and BFC-80 models, exemplifies their commitment to innovation and efficiency. These units are designed to meet the demanding needs of both residential and commercial applications, providing reliable hot water solutions.

The A.O. Smith BFC-100 and BFC-80 are distinguished by their high capacity and robust design. The BFC-100 model boasts a capacity of 100 gallons, while the BFC-80 is ideal for those requiring 80 gallons. This makes them suitable for larger households or commercial establishments where hot water demand can be significant.

One of the primary features of these models is their advanced heating technology. Both units utilize a high-efficiency burner that ensures rapid heating and minimal energy consumption. This means users benefit from shorter wait times for hot water, reducing overall energy costs. The BFC series is also equipped with a special flame retention head that enhances combustion efficiency and prolongs the lifespan of the unit.

In terms of construction, the BFC-100 and BFC-80 models are built with high-quality materials that enhance durability and resistance to corrosion. The tanks are insulated with high-density foam, which improves energy retention and helps maintain water temperature for longer periods. This is crucial for conserving energy and minimizing heating costs.

Safety is a top priority for A.O. Smith, and the BFC series reflects this commitment. Each unit comes with a range of safety features, including a temperature and pressure relief valve that prevents overheating and excessive pressure buildup. Additionally, they are designed to meet strict industry standards, ensuring peace of mind for users.

Installation of both models is straightforward, with flexible venting options that accommodate various building layouts. Whether you are upgrading an existing water heating system or installing a new one, the BFC series is designed to integrate seamlessly.

In summary, the A.O. Smith BFC-100 and BFC-80 are excellent options for those seeking reliable, efficient, and durable water heating solutions. With their impressive capacity, advanced heating technology, robust construction, and safety features, these models stand out in the market and are sure to meet the hot water needs of any household or commercial space. Whether for residential use or in a business setting, A.O. Smith’s BFC series represents quality and innovation in hot water heating.