gis

•the Pressure switch;

•the Flame probe.

2.4.2Water temperature protection

The electronic controller uses temperatures sensors T1 (7) and T2 (13) to monitor three temperatures that are important for safety. The table explains the functioning of the temperature sensors.

Temperature protection

Protection

Description

 

 

Against frost

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

(T1 < 5°C or T2 < 5°C)

 

For maximum water temperature

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

(T1 > 85°C or T2 > 85°C)

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

 

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

 

water has cooled sufficiently (T1 < 78°C), the electronic controller resets the

 

appliance.

 

 

For extra safety

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

(T1 > 93°C or T2 > 93°C)

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

 

conditions"). The reset may only be performed if T1 <78°C.

2.4.3Gas valve

The electronic controller opens the gas valve so that gas can be supplied to the burner. As a safety measure, the gas valve has a double shut-off. The double shut-off guarantees complete isolation of the appliance from the gas supply.

To help ensure smooth ignition, the gas valve opens gradually ('softlite").

2.4.4Fan

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 electronic controller (4). The electronic controller takes control if the speed of rotation varies too much from the set value.

2.4.5Pressure switch

The pressure switch ensures the discharge of flue gases and the supply of incoming air during the pre-purge and normal running of the appliance. The default state of the pressure switch is open. When sufficient pressure difference is reached, the pressure switch closes. However, in the event of a fault, the pressure switch is tripped open, and the heating cycle is interrupted. The table shows the trip point per appliance.

Note

The trip point of the pressure switch is not adjustable.

Pressure switch trip points

Appliance

Closing pressure difference

Opening pressure difference

 

 

 

BFC 80

> 1005 Pa

< 975 Pa

 

 

 

BFC 100

> 1145 Pa

< 1115 Pa

 

 

 

Instruction manual BFC

15

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A.O. Smith BFC - 80, BFC -100 Water temperature protection, Gas valve, 4 Fan, Pressure switch, Protection Description
Page 14 Page 16

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.
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