Manuals / A.O. Smith / Household Appliance / Water Heater

A.O. Smith BFC - 60, BFC - 30 service manual Appliances heating cycle Protection for the appliance

Models: BFC - 30 BFC - 60

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Working principle of the appliance

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2.3The appliance's heating cycle

2.4Protection for the appliance

2.4.1

In this appliance the cold water enters the bottom of the tank via the cold water inlet (14). Once heated by the combustion chamber (8) and heat exchanger (11), the hot tapwater leaves the tank through the hot water outlet (2). Once the appliance is completely filled with water, it remains constantly under water supply pressure. As hot water is drawn from the appliance, it is immediately replenished with cold water.

The air required for combustion is forced into the burner (17) by the fan (18).

The gas is fed to the burner via the gas valve (16). Thanks to the modulated supply of gas and air, the optimum gas/air mixture is always achieved. The special construction of the burner causes the mixture to form a vortex (the cyclone effect), before it becomes ignited. This vorticity improves the ignition on the hot surface igniter (20), as well as ensuring optimum combustion efficiency. Through the special design of the heat exchanger (11), the flue gases are first led downwards via the combustion chamber, then upwards again via the heat exchanger, then once more downwards beside the water in the tank. In this process, the flue gases gradually become cooler. Because the cooled flue gases flow alongside the cold water lower down in the tank, they start to condense. This condensation causes latent heat energy to be released, which is transferred to the cooler water, thereby increasing the energy performance of the unit. The condensate yielded by this process is discharged via the siphon (23).

The insulation layer (24) prevents heat from escaping. The inside of the tank is enamelled to protect against corrosion. The anodes (9) provide extra protection against corrosion.

For use during maintenance, the appliance has an inspection and cleaning opening (12).

The water temperature is measured by temperature sensors T1 (7) in the top of the tank (10) and T2 (13) at the bottom of the tank. These temperatures are sent to the electronic controller. Based on these two observations, the electronic controller calculates a net water temperature: Tnet. The value of Tnet lies between the temperatures at the top and bottom of the tank. As soon as Tnet falls below the set water temperature (Tset), the electronic controller registers a "heat demand". The gas control (16) is opened, and the gas is mixed with air. This mixture is ignited by the hot surface igniter (20) and the water becomes heated. As soon as Tnet rises above Tset the heat demand ends, and the electronic controller stops the heating cycle.

The electronic controller assumes a certain margin both when registering and ending heat demand. We refer to this margin as the hysteresis (12.2 "Setting the hysteresis").

Introduction

The electronic controller monitors the water temperature and ensures safe combustion. This is achieved by:

•the Water temperature protection;

•theGas valve;

•the Fan;

•the Pressure switch;

•the Flame probe.

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Instruction manual BFC

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A.O. Smith BFC - 60, BFC - 30 Appliances heating cycle Protection for the appliance, Working principle of the appliance
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BFC - 30, BFC - 60 specifications

A.O. Smith is a well-regarded name in the water heating industry, known for producing innovative and efficient water heaters. Among their renowned products are the BFC - 60 and BFC - 30 models, which have gained popularity for their performance and reliability.

The A.O. Smith BFC - 60 and BFC - 30 are both designed to meet the diverse needs of residential and commercial users. The BFC - 60 has a capacity of 60 gallons, making it ideal for larger households or commercial settings where hot water demand is high. Meanwhile, the BFC - 30, with its 30-gallon capacity, caters to smaller households or establishments with lower hot water requirements.

One of the standout features of both models is their advanced heating technology. They are equipped with a high-efficiency burner system, which enhances the heating process while minimizing energy consumption. This means that users experience quicker recovery times and can enjoy a steady supply of hot water without the long wait associated with traditional heaters. The BFC series is designed to save energy, aligning with modern demands for sustainability.

Another significant characteristic of these models is their durable construction. Made with high-quality materials, including glass-lined tanks, they are built to resist corrosion and extend the lifespan of the water heater. This durability contributes to fewer maintenance requirements, giving users peace of mind.

In terms of safety, A.O. Smith has incorporated numerous features into the BFC series. Both models come with safety valves and thermostat controls to ensure that water is heated to appropriate temperatures, reducing the risk of scalding and malfunction. Additionally, their design allows for easy installation and maintenance, making them a user-friendly option.

Another aspect that distinguishes the BFC series is its compact design. Both models have a space-saving profile, making them suitable for installation in various locations, including tight utility rooms or basements. This flexibility allows homeowners and businesses to maximize their space without sacrificing performance.

Overall, the A.O. Smith BFC - 60 and BFC - 30 are exemplary water heating solutions that combine efficiency, durability, and safety. With their advanced features and technologies, they are an excellent choice for anyone in need of reliable hot water, ensuring comfort and satisfaction for years to come.