American Water Heater 381T1206NOX, BCL, 381T1546NOX UGB Blower Speed Control, SW2 SW4 Used for

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UGB – BLOWER SPEED CONTROL

The BCL 120 thru 250(A) models are equipped with a UGB PWM output control board for blower speed control. When the UGB J5.6 is energized by T-stat Call-for-heat, the UGB will provide 90% duty cycle PWM signal to the blower for 20 seconds prepurge, then provide a PWM control signal per SW2 dipswitch setting for igntion speed. After the flame is confirmed and the UGB J5.3 is energized by the main gas control of the igntion module, the UGB will provide a high blower speed control per SW4 dipswitch setting. For the detailed SW2 and SW4 dipswitch settings of different BCL models, see the dipswitch table listed in this page.

SW4

J5

SW2

J6

PART NO.

SW2

SW4

USED FOR

323859-000

7

2

BCL381T1206NOX

323859-001

8

B

BCL381T1546NOX

323859-002

6

A

BCL395T1806NOX

323859-003

3

3

BCL395T1996NOX

323859-004

3

8

(A)BCL395T2506NOX

PIN CONNECTIONS

 

PIN NUMBER

DESCRIPTION

 

J5.5

24VAC H

J5

J5.1

24VAC N

 

J5.6

ENABLE

 

J5.3

HIGH FIRE

 

J5.2, 5.4, 5.7, 5.8

NOT USED

 

J6.1

24VDC H

J6

J6.2

24VDC RTN

 

J6.3

NOT USED

 

J6.4

PWM OUTPUT

28

Servicing should only be performed by a Qualified Service Technician

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Contents Commercial GAS Water Heaters For Models BCLPage Table of Contents Introduction Service WarningService Reminder QualificationsTools Required Multiple Appliance Installations Installation ConsiderationsGas and Electrical Characteristics GAS Pressure RequirementsAIR Supply MAKE-UP AIR Direct Communication with Outdoors Contaminated AIRClosed Water Systems Power SupplyAIR Requirements Thermal ExpansionFeatures and Components Blower and Burner Assembly Burner ReplacementPage Spark Igniter Spark Igniter, Flame Sensor, Sight GlassSpark Igniter / Flame Sensor / Control Timing Flame SensorMinimum Clearances Installation Venting Category and MaterialsVenting BCL VentingExterior Clearances Venting Tables Technical Venting Data Type B GAS VentOperation and Service Sequence of OperationSequence of Operation Flow Chart YESFor Your Safety Read Before Operating Lighting and Operating LabelTroubleshooting Complaint Cause Remedy User Qualified AgencyControls Overview Control BOX Assembly Pressure Switches All ModelsHigh Limit SWITCH/ Digital Thermostat Display Lights Digital Thermostat LED Indication Action StatusContinuity Check of High Limit ECO ConditionsThen Upper Temperature Probe Continuity Check Ohms Resistance TableOhms Lower Temperature Probe Continuity Check Wiring Terminals Description Ignition ControlFlame FAILURE- Recycle Mode Start UP/ Flame RECOVERY/ Safety LockoutStart UP Heat Mode Failure to Light LockoutInternal Control Failure Fault ConditionsTroubleshooting Guide for Ignition Control Flame Sensor Current CheckUGB Blower Speed Control SW2 SW4 Used forPIN Connections PIN Number Description 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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