SEQUENCE OF OPERATION – FLOW CHART

Switch power on to unit

Thermostat calls for heat

UGB sends PWM signal to Blower to start the blower at high purge speed

Blower engages Prover Switch

20 seconds later blower

A￿er 30 seconds, Igni￿on

Control provides power to

Spark Igniter and opens Gas

Valve

Igni￿on Control maintains spark for up

to 4 seconds and monitors Flame Sensor to determine if Burner is lit

Does Burner

NO

 

light?

 

YES

Igni￿on Control changes Blower from low speed to high speed a￿er 5 seconds

Igni￿on Control monitors

flame signal

YES

Loss of flame signal?

NO

Thermostat is sa￿sfied

Blower – off; Blower Prover – opens

Igni￿on Control – off; Gas Valve – closes

 

NO

 

 

 

 

 

 

 

 

 

 

 

Is this the third

YES

 

Wait 15 minutes.

 

 

 

 

Gas Valve – off

 

 

Blower runs at

 

 

igni￿on trial?

 

 

low speed

 

 

 

 

 

 

 

 

 

 

 

 

 

NO

 

YES

 

Gas Valve – off

Is this the third loss

of flame signal?

 

 

 

16

Servicing should only be performed by a Qualified Service Technician

Page 18
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American Water Heater 395T1806NOX, ULTRA LOW NOx SERIES 104, BCL, 381T1206NOX manual Sequence of Operation Flow Chart, Yes

381T1546NOX, 395T1996NOX, BCL, 381T1206NOX, 395T2506NOX specifications

The American Water Heater Ultra Low NOx Series represents a significant advancement in water heating technology, aiming to meet stringent environmental regulations while delivering reliable hot water for residential applications. Models such as the 104,395T1806NOX, 395T2506NOX, 381T1206NOX, and BCL are designed to prioritize efficiency, performance, and compliance with the latest emission standards.

One of the defining features of the Ultra Low NOx Series is its innovative combustion technology. These water heaters utilize a state-of-the-art gas burner that dramatically reduces nitrogen oxide (NOx) emissions, ensuring compliance with local and federal regulations. This technology not only benefits the environment but also contributes to improved indoor air quality.

Efficiency is a hallmark of the Ultra Low NOx Series, with models designed to maximize energy savings while delivering consistent hot water. They feature a user-friendly, adjustable thermostat, providing homeowners with the ability to set their desired water temperature for optimal comfort. In addition, the insulation on these water heaters is designed to minimize heat loss, ensuring that energy consumption is kept to a minimum.

The Ultra Low NOx models are equipped with an easy-to-use digital control panel that allows homeowners to monitor and adjust settings with ease. This convenience is enhanced by advanced diagnostics, which provide real-time alerts regarding system performance and maintenance needs. This proactive approach helps extend the lifespan of the unit and enhances reliability.

Safety is another crucial characteristic of the Ultra Low NOx Series. Each model is equipped with safety features such as a flame rollout switch and a fully automatic gas shut-off, which ensure that the system operates safely under various conditions.

In terms of installation and maintenance, these models are designed with user-friendly features, making the process simpler for technicians. The compact design allows for flexible installation options, even in tighter spaces.

Overall, the American Water Heater Ultra Low NOx Series, including the 104,395T1806NOX, 395T2506NOX, 381T1206NOX, and BCL models, represents an excellent choice for homeowners seeking an efficient, reliable, and environmentally responsible water heating solution. With a focus on reducing emissions and enhancing performance, these models are built to meet the demands of today's conscientious consumers.