Manuals / Bradford-White Corp / Household Appliance / Water Heater

Bradford-White Corp U4TW60T*FRN Control Timings, Wiring Diagram, Specifications, Page

Models: U4TW60TFRN U4TW40TFRN U4TW50T*FRN

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Specifications

	Control Timings

Ignition State	Timing

Pre-purge	15 seconds

Trial for Ignition	90 seconds

Flame Stabilization Period	3 seconds

Inter-purge	15 seconds

Flame Failure Response Time	1.5 seconds (2 second maximum, 1 second minimum)

Post-purge	15 seconds

PS Fault Delay (failed open/close)	Retry after 2 minutes

Soft Lockout	Retry after 5 minutes

TCO Limit Lockout	Indefinite (see page 34 to reset)

Verify Resistive Delay	Retry after 2 minutes (repeats 5 times)

Simulated Resistive Load Lockout	Indefinite (cycle power to reset)

Hardware Error Lockout	Indefinite (self clears if fault clears for at least 15 seconds)

Wiring Diagram

BLOWER
BLOWER			BLOWER
TEMPERATURE			MOTOR
SWITCH
			M
PRESSURE	G
PRESSURE			BL
SWITCH W		Y	BL
SWITCH W		Y
	W		R
BK		Y
G		Y
G
PILOT

Honeywell

	PLUG
	BKBK
	BK
G W	Y
G W
R
BK BL	WATER TEMPERATURE

	SENSOR
RESETTABLE	FLAMMABLE
RESETTABLE
THERMAL	VAPOR SENSOR
THERMAL

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Bradford-White Corp U4TW60T*FRN, U4TW50T*FRN Control Timings, Wiring Diagram, Specifications, Page, Ignition State

Contents

Denotes Warranty Years Model Shown U-4-TW-40T6FRN SERVICE MANUALTroubleshooting Guide and Instructions for Service To be performed ONLY by qualified service providersTable of Contents SectionPage DANGER FAILURE TO INSTALL AND MAINTAIN A NEW, LISTED 3/4” X 3/4” TEM Introduction The Bradford White ECO-DEFENDER Safety SystemIntroduction How to Use this Manual How to Use this ManualHow the Safety System Works Tools Required for Service Tools RequiredPage Specifications40 Gallon 50 Gallon 60 Gallon Vent TablesSpecifications Page48 Gallon 65 Gallon SpecificationsVent Tables PagePage Wiring DiagramControl Timings SpecificationsNormal Heating Sequence Power Up SequenceSequence of Operation Sequence of Operation Normal Heating Sequence cont’dAbnormal Operation Sequence of Operation Abnormal Operation cont’dAbnormal Operation cont’d 4. Trial for Ignition FaultSequence of Operation Abnormal Operation cont’d 5. Flame Sensing FaultSequence of Operation LED Status TroubleshootingService Procedure PageLED Status TroubleshootingService Procedure PageLED Status TroubleshootingService Procedure PageBurner Inspection Burner MaintenanceBurner Cleaning Procedure Burner Maintenance Burner Cleaning Procedure cont’dBurner Cleaning Procedure cont’d Pilot MaintenancePilot Inspection, Testing and Replacement Pilot Maintenance Pilot Inspection, Testing and Replacement cont’dPage Pilot Inspection, Testing and Replacement cont’d Pressure Switch TestingPressure Switch Testing Page Pressure Switch Testing cont’dPressure Switch Testing Pressure Switch Replacement Pressure Switch ReplacementBlower Testing Blower TestingPage Blower Removal Blower ReplacementBlower Installation Blower Temperature Switch Testing Blower Temperature Switch TestingBlower Installation cont’d Common causes for high exhaust temperature Blower Temperature Switch Testing cont’dBlower Temperature Switch Testing Switch SettingBlower Temperature Switch Replacement Blower Temperature Switch ReplacementThermal Well Testing Thermal Well TestingDetermine Water Temperature Inside Tank Determine Tank TemperatureThermal Well Testing cont’d Page Component DisassemblySensor Resistance at Various Temperatures Gas Control & Thermal Well Removal From Water HeaterPage Gas Control RemovalGas Control Removal From Thermal Well cont’d Gas Control AssemblyGas Control Assembly to the Thermal Well Gas Control Assembly Gas Control Assembly to the Thermal Well cont’dDoing so will damage the connector. Use special pin type Flammable Vapor Sensor TestingFlammable Vapor Sensor Testing Gas Control Assembly to the Thermal Well cont’dPage 115 VAC Circuit TracePage Safety Circuit Voltage TraceSafety Circuit Voltage Trace Blower Removal Remove the Blower to Gain Access to the Flue BaffleDip Tube Inspection Remove the Blower to Gain Access to the Flue Baffle cont’dDip Tube Inspection and Replacement Anode Inspection Anode Inspection and ReplacementInner Door Removal Inner Door Removal ProcedureInner Door Gasket Replacement Procedure Inner Door Gasket ReplacementInner Door Removal Procedure cont’d Inner Door Installation with Gasket Inner Door InstallationScreenLok Flame Arrestor Cleaning Procedure Arrestor CleaningCommon Terms Common TermsPart Name and Description Parts ListPage Email parts@bradfordwhite.com techserv@bradfordwhite.com

Control Timings

Ignition State

Timing

Wiring Diagram