Bradford-white TW4-75S-76B-3X User Manual

Save this manual for future referenceManual 45960A(*) Denotes Warranty Years(To be performed ONLY by qualified service providers)For Bradford WhiteTTW

Sequence of OperationThermostat calls for heat.Prior to energizing blower, gas control checks safety circuit to insure the circuit is open. Normal swi

Steady state operation.During Steady State Operation the Control Monitors:Thermostat temperature sensor-When set point temperature is satisfied, gas v

Sequence of Operation3. Pressure Switch/Blower Temperature Fault:a) Pressure switch closed at start of call for heat - The gas control waits four seco

Short flash, once every four seconds“Heartbeat”, alternates bright/dimThermostat callingfor heat (no fault).Short flash once every 3 secondWeak pilot

Six-four flash, three second pauseUndesired-false pilot flame sensed.System auto resets. Seven flash, three second pauseSimulated Resistive Device Har

Step 1. With main burner in operation, remove outer jacket door and slide inner door from left to right to open.Step 2. To adjust for proper burning,

Burner CleaningStep 1. Position gas control power switch to the“OFF” position and unplug heater from walloutlet.Step 2. Turn off gas supply to water h

TTW SERVICE PROCEDURE IIPilot testing, Cleaning and ReplacementPilot Inspection, Testing and ReplacementStep 1. Position gas control power switch to

TTW SERVICE PROCEDURE IIIPressure Switch Testing and ReplacementPressure Switch TestingWARNING115 volt potential exposure. Use cautionmaking voltage c

Pressure Switch ReplacementWARNING115 volt potential exposure. Use cautionto avoid personal injury.Step 6. Reconnect wires from step 5 to new pressure

Page TTW Service ProcedureIntroduction 4 - - -How to use this manual 5 - - -Tool required for service 5 - - -Specifications

TTW SERVICE PROCEDURE IVBlower Testing and ReplacementWARNING115 volt potential exposure. Use caution when making voltage checks to avoid personal in

TTW SERVICE PROCEDURE IVBlower Testing and ReplacementStep 1. Position gas control power switch to the “OFF” position.Step 2. Unplug blower power cor

TTW SERVICE PROCEDURE VBlower Temperature Switch Testing and ReplacementBlower Temperature Switch Testing.WARNING115 volt potential exposure. Use cau

TTW SERVICE PROCEDURE VBlower Temperature Switch Testing and ReplacementBlower Temperature Switch Replacement.WARNING115 volt potential exposure. Use

Thermal Well TestingPosition gas valve power switch to the “OFF” position and disconnect thermal well harness from gas control.NYUsing a multi-meter s

°F 0 1 2 3 4 5 6 7 8 940 26109 25400 24712 24045 23399 22771 22163 21573 21000 2044550 19906 19383 18876 18383 17905 17440 16990 16553 16128 1571560 1

TTW SERVICE PROCEDURE VIGas Control & Thermal Well Testing and ReplacementGas Control & Thermal Well Removal From Water HeaterStep 1. Positio

Gas Control Assembly to Thermal WellStep 6. Reconnect wire harnesses to gas control per the illustration.Step 7. Reconnect gas piping to gas control.

Page 28TTW SERVICE PROCEDURE VIISimulated Resistive Device TestingSimulated Resistive deviceStep 1. Position power switch on gas control to the “OFF”

TTW SERVICE PROCEDURE VIIISafety Circuit Voltage TraceSafety Circuit Voltage TraceWARNING115 volt potential exposure. Use cautionmaking voltage check

WARNING: If the information in these instructions is not followed exactly, a fire or explosion may result causing property damage, personal injury, or

TTW SERVICE PROCEDURE IX115 VAC TraceWARNING115 volt potential exposure. Use cautionmaking voltage checks to avoid personal injury.Disconnect cord se

TTW SERVICE PROCEDURE XDip TubeInspection and replacementStep 1. Position on/off switch of gas control valve to “OFF” position and unplug water heate

TTW SERVICE PROCEDURE XIAnodeInspection and replacementStep 1. Position on/off switch of gas control valve to the “OFF” position and unplug water hea

TTW SERVICE PROCEDURE XIIFlue BaffleInspection and replacementStep 1. Position gas control power switch to the “OFF” position and unplug blower from

NOTESPage 34Glossary of TermsBTU British Thermal UnitsGPM Gallons per MinuteHz HertzKW/h Killo-watts per hourLED Light Emitting DiodeNPT National Pipe

Parts List1. Blower Complete2. Air Mixing Inlet cover3. Pressure Switch4. Blower Temp. Switch5. Blower Gasket6. Blower Power Cord7. Vent Adapter

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Page 4IntroductionThe new Bradford White TTW1, TTW2 & TW4 water heaters are designed to provide reliable performance with enhanced standard featu

It is intended for this manual to be used by qualified service personal for the primary purpose of troubleshooting and repair of the Bradford White TT

SpecificationsThermal well TCO Limit Residential 188°F (87°C), Commercial 199°F (93°C)Residential Temperature Set Point Range60°F (16°C) to 160°F (71°

SpecificationsVenting Specifications for:40 Gallon50 GallonThrough the WallTerminating# ofElbowsMaximum StraightLength ft (m)Minimum StraightLength ft

SpecificationsVenting Specifications for:48 Gallon65 GallonThrough the WallTerminating# ofElbowsMaximum StraightLength ft (m)Minimum StraightLength ft

Control TimingsIgnition State TimingPre-purge 2 SecondsTrial for Ignition 90 SecondsFlame Stabilization Period 3 SecondsInter-purge 15 SecondsFlame Fa