Bradford-White Corp U4TW60T*FRN Blower Temperature Switch Testing cont’d, Switch Setting

Page 32

Blower Temperature Switch Testing

Blower Temperature Switch Testing (cont’d)

Switch Setting

Opens on rise @ approximately 165oF

Auto resets on fall @ approximately 160oF

Cool switch to

below 160oF

Disconnect wire leads to switch. Using multi-meter set N

to the ohms setting. Is there

Replace switch

continuity between the switch

terminals?

(see page 33).

Common causes for high

exhaust temperature

Y

 

 

 

 

 

 

N

 

 

Reconnect wire leads and ob-

Y

 

 

 

serve heater operation. Do

Do switch

Y

Exhaust

 

exhaust gas temperatures

 

contacts

 

temperature

rise to or above 170oF with

 

open?

 

is too hot.

vent connected?

 

 

 

 

N

 

 

 

 

Y

Replace switch

 

 

Do switch con-

 

 

tacts open?

 

(see page 33).

 

 

N

Switch OK

1.Vent length is below mini- mum allowable

2.Vent diameter not to speci- fication

3.Restricted dilution air inlet

4.Missing or deteriorated flue baffle

5.Gas pressure is out of specification

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Contents Service Manual Table of Contents Page Page Bradford White ECO-DEFENDER Safety System IntroductionHow to Use this Manual How the Safety System WorksTools Required for Service Tools RequiredSpecifications Vent Tables GallonSpecifications Wiring Diagram Control TimingsNormal Heating Sequence Power Up SequenceSequence of Operation Normal Heating Sequence cont’d Abnormal OperationAbnormal Operation cont’d Sequence of Operation Sequence of Operation Troubleshooting LED Status Control Status Probable Cause Service ProcedureTroubleshooting Troubleshooting Burner Inspection Burner MaintenanceBurner Cleaning Procedure 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 TestingPage Blower Removal Blower ReplacementBlower Installation Blower Temperature Switch Testing Blower Temperature Switch TestingBlower Installation cont’d Blower Temperature Switch Testing cont’d 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 Gas Control & Thermal Well Removal From Water Heater Component DisassemblySensor Resistance at Various Temperatures Gas Control Removal Gas Control Removal From Thermal Well cont’d Gas Control AssemblyGas Control Assembly to the Thermal Well Gas Control Assembly to the Thermal Well cont’d Flammable Vapor Sensor Testing Flammable Vapor Sensor TestingVAC Circuit Trace Safety Circuit Voltage Trace Safety Circuit Voltage TraceRemove the Blower to Gain Access to the Flue Baffle Blower RemovalDip Tube Inspection Remove the Blower to Gain Access to the Flue Baffle cont’dDip Tube Inspection and Replacement Anode Inspection and Replacement Anode InspectionInner Door Removal Procedure Inner Door RemovalInner Door Gasket Replacement Procedure Inner Door Gasket ReplacementInner Door Removal Procedure cont’d 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
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