Bradford-White Corp UTW450S60FR*N, UTW465S60FR*N, U2TW50T*FRN Safety Circuit Voltage Trace

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Control access
cover

Safety Circuit Voltage Trace

WARNING

115 volt potential exposure. Use caution making voltage checks to avoid

personal injury.

Safety Circuit Voltage Trace

Note: This procedure assumes a cold tank.

Step 1. Remove three screws (Phillips screw driver) from control access cover on blower and remove

cover.

Position gas control switch to the “ON”

 

 

 

 

 

position and adjust the thermostat dial

N

Is LED on gas valve flash- Y

to call for heat. Is there 10 to 13VAC

 

 

ing the “heartbeat” code

between the red wire leading to the

 

 

(alternating bright/dim)?

blower temperature switch and the

 

 

 

 

 

 

green ground wire? Blower must be

 

 

N

running during this voltage check (see

 

 

 

 

 

 

 

photo 15).

 

Verify 115VAC to gas con-

 

 

 

 

 

 

trol (see page 41).

 

 

Y

 

N

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

14

No voltage from gas control.

Call for technical support.

Determine cause of blower temperature switch activa- tion and correct.

Is there 10 to 13VAC between

the yellow wire leading from the N pressure switch and the green ground wire (see photo 27)?

Is there continuity through

the blower temperature switch (see page 31)?

YCheck for loose or broken

wire connection at switch terminals.

Y

Do you hear or can you see the igniter sparking?

Y

Safety circuit voltage is OK.

N

Check igniter/sensor (see page

22). Is igniter/sensor OK?

Correct igniter/ sensor problem

Green ground wire

Red sire leading to blower temp. switch

Y

Faulty cord set or gas control

15

If burner does not light, ob- serve LED flash code on gas control and refer to trouble- shooting section on page 17.

Yellow wire leading from pressure switch

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Contents Service Manual Table of Contents Page Page Bradford White ECO-DEFENDER Safety System IntroductionIntroduction How to Use this Manual How the Safety System WorksHow to Use this Manual Tools Required for Service Tools RequiredSpecifications Vent Tables Gallon-40,000 BTU/hr Gallon-42,000 BTU/hrGallon-60,000 BTU/hr Wiring Diagram Control TimingsIgnition State Timing Power Up Sequence Sequence of OperationNormal Heating Sequence Normal Heating Sequence cont’d Abnormal OperationAbnormal Operation cont’d Sequence of Operation Sequence of Operation Troubleshooting Probable Cause Service ProcedureLED Status Control Status Probable Cause Service Procedure Troubleshooting Burner Maintenance Burner Cleaning ProcedureBurner Inspection Burner Cleaning Procedure cont’d Pilot Maintenance Pilot Inspection, Testing and ReplacementPilot Inspection, Testing and Replacement cont’d Page Pressure Switch Testing Pressure Switch TestingPressure Switch Testing cont’d Pressure Switch Replacement Pressure Switch ReplacementBlower Testing Blower TestingBlower Testing Blower Replacement Blower InstallationBlower Removal Blower Temperature Switch Testing Blower Installation cont’dBlower Temperature Switch Testing Blower Temperature Switch Testing cont’d Switch SettingCommon causes for high Exhaust temperature Blower Temperature Switch Replacement Blower Temperature Switch ReplacementThermal Well Testing Thermal Well TestingDetermine Tank Temperature Thermal Well Testing cont’dDetermine Water Temperature Inside Tank Component Disassembly Sensor Resistance at Various TemperaturesGas Control & Thermal Well Removal From Water Heater Gas Control Removal Gas Control & Thermal Well Removal From Water Heater cont’dGas Control Removal From Thermal Well Gas Control Assembly Gas Control Assembly to the Thermal WellGas Control Removal From Thermal Well cont’d Gas Control Assembly to the Thermal Well cont’d Flammable Vapor Sensor Testing Flammable Vapor Sensor TestingVAC Circuit Trace VAC Circuit Trace Safety Circuit Voltage Trace Safety Circuit Voltage TraceRemove the Blower to Gain Access to the Flue Baffle Blower RemovalRemove the Blower to Gain Access to the Flue Baffle cont’d Dip Tube Inspection and ReplacementDip Tube Inspection Anode Inspection and Replacement Anode InspectionInner Door Removal Procedure Inner Door RemovalInner Door Gasket Replacement Inner Door Removal Procedure cont’dInner Door Gasket Replacement Procedure Inner Door Installation Inner Door Installation with GasketArrestor Cleaning ScreenLok Flame Arrestor Cleaning ProcedureCommon Terms Common TermsParts List Part Name and DescriptionParts@bradfordwhite.com Techserv@bradfordwhite.com

U1TW40S*FRN, U2TW65T*FRN, UTW450S60FR*N, U1TW60T*FRN, UTW465S60FR*N specifications

Bradford-White Corp has long been a reputable manufacturer in the water heating industry, known for delivering high-quality and reliable products. Among their diverse range of water heaters, the U1TW40S*FRN, U1TW50S*FRN, U1TW60T*FRN, UTW465S60FR*N, and UTW450S60FR*N models stand out for their advanced features and technologies designed to meet varying hot water demands.

The U1TW series, including the U1TW40S*FRN, U1TW50S*FRN, and U1TW60T*FRN models, are well-suited for residential applications. Each model provides different capacities, with the numbers referring to the gallon capacities. The U1TW40S*FRN offers 40 gallons, the U1TW50S*FRN 50 gallons, and the U1TW60T*FRN 60 gallons, making them ideal for households varying in size and hot water requirements.

These models are equipped with Bradford-White's advanced Vitraglas® tank lining, a unique feature that provides superior protection against corrosion and extends the unit's lifespan by ensuring the inner tank remains free from damage. Additionally, their efficient heating elements and optimal insulation minimize heat loss, enhancing energy savings.

The UTW series, specifically the UTW465S60FR*N and UTW450S60FR*N, feature innovative technologies such as a durable stainless steel construction that offers robust performance while resisting the harmful effects of rust and degradation. This is particularly beneficial in areas with hard water, where mineral buildup can be problematic.

Each unit incorporates Bradford-White's signature HydroBurner® technology, which enhances combustion efficiency, ensuring that the water is heated quickly and consistently. This technology also helps in reducing greenhouse gas emissions, addressing environmental concerns while maintaining optimal performance.

In terms of ease of use, all models come with user-friendly controls that allow for easy temperature adjustments and monitoring, ensuring that users can customize their hot water needs conveniently. Additionally, features such as intuitive diagnostics enable quick troubleshooting, reducing downtime and maintenance efforts.

In conclusion, Bradford-White’s U1TW and UTW series water heaters are engineered to offer efficiency, durability, and user-friendly operation. With their advanced technology, excellent insulation, and robust construction, these models are a solid choice for anyone looking to invest in reliable hot water solutions for their home. Whether for a busy family or more modest hot water needs, these units provide peace of mind and consistent performance.
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