American Water Heater 381T1546NOX, BCL, 381T1206NOX Operation and Service, Sequence of Operation

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OPERATION AND SERVICE

SEQUENCE OF OPERATION:

1.Switch power on to unit.

2.Thermostat calls for heat.

3.UGB (Universal Gas Board) sends PWM signal to blower to start the blower.

4.Blower runs at high prepurge speed for 20 seconds.

5.Combustion Blower initiates air flow through water heater closing the Prover Switch.

6.After 30 seconds, the Ignition Control provides power to the Spark Igniter and Gas Valve.

7.Ignition Control maintains spark for up to 4 seconds and monitors Flame Sensor to determine if Burner is lit.

8.If the Flame Sensor does not detect proper flame, the Ignition Control shuts off the Gas Valve and allows the Blower to purge the unit. At that time, the Ignition Control restarts with step 6. It will try and ignite the main burners 2 more times. If the unit does not light, the Ignition Control will wait 15 minutes and then restart at step 6. This cycle will continue until the unit lights or the power is shut off to the unit.

9.If the Flame Sensor detects proper flame, the Ignition Control will energize the main gas valve output, which will make the blower to run at a pre-determined high speed until call-for-heat is removed from T-stat.

10.Once the unit is satisfied, the Thermostat will shut off the Blower, Gas Valve and Ignition Control and the unit will be in standby mode until another call for heat is initiated by the thermostat.

Servicing should only be performed by a Qualified Service Technician

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Contents For Models BCL Commercial GAS Water HeatersPage Table of Contents Service Reminder Service WarningIntroduction QualificationsTools Required Gas and Electrical Characteristics Installation ConsiderationsMultiple Appliance Installations GAS Pressure RequirementsAIR Supply Contaminated AIR MAKE-UP AIR Direct Communication with OutdoorsAIR Requirements Power SupplyClosed Water Systems Thermal ExpansionFeatures and Components Burner Replacement Blower and Burner AssemblyPage Spark Igniter / Flame Sensor / Control Timing Spark Igniter, Flame Sensor, Sight GlassSpark Igniter Flame SensorVenting Installation Venting Category and MaterialsMinimum Clearances BCL VentingExterior Clearances Type B GAS Vent Venting Tables Technical Venting DataSequence of Operation Operation and ServiceYES Sequence of Operation Flow ChartLighting and Operating Label For Your Safety Read Before OperatingComplaint Cause Remedy User Qualified Agency TroubleshootingPressure Switches All Models Controls Overview Control BOX AssemblyHigh Limit SWITCH/ Digital Thermostat Status Display Lights Digital Thermostat LED Indication ActionThen Continuity Check of High Limit ECOConditions Ohms Upper Temperature Probe Continuity CheckOhms Resistance Table Lower Temperature Probe Continuity Check Ignition Control Wiring Terminals DescriptionStart UP Heat Mode Start UP/ Flame RECOVERY/ Safety LockoutFlame FAILURE- Recycle Mode Failure to Light LockoutTroubleshooting Guide for Ignition Control Fault ConditionsInternal Control Failure Flame Sensor Current CheckPIN Connections PIN Number Description UGB Blower Speed ControlSW2 SW4 Used for Wiring Diagram American Water Heaters

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.
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