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Bradford-White Corp M430T*F(BN - page 1
SERVICE MANU AL Flammable V apor Ignition Resistant W ater Heater Troubleshooting Guide and Instruction f or Service (T o be perf ormed ONL Y b y qualified service providers) F or the Bradford White Defender Safety System ™ Models: MI30T*F(BN,CX)2 MI30S*F(BN,CX)2 MI303T*F(BN,CX)2 MI40T*F(BN,CX)2 MI403S*F(BN,CX)2 MI404T*F(BN,CX)2 MI503*F(BN,CX)2 M ...
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Bradford-White Corp M430T*F(BN - page 2
2 Flammable V apor Ignition Resistant W ater Heater T able of Cont ents P ag e Service Pr ocedur e Introduction 3 - - - T rouble shooting Char t 4 - - - Inner Door Gask et Remo val, Inspection, Replacement and Installation 5 RG-I Thermocouple T esting and Replacement 8 RG-II Pilot Assembly Inspection Cleaning and Replacement 1 0 RG-III Piezo Ignite ...
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Bradford-White Corp M430T*F(BN - page 3
3 Introduction The Br adf or d Whit e DEFENDER Safety Sy s t em ™ The Bradf ord Whit e DEFENDER Saf ety Sys t em TM was designed t o resis t t he ignition of flammable vapors that can occur outside of the water heater . Use and installation are nearly identical to previous versions of atmospherically f ired and vent ed wat er heaters. A number of ...
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Bradford-White Corp M430T*F(BN - page 4
4 S YMPT OM PR OB ABLE C A USE C ORRECTIVE A CTION Pilot Will Not Light 1 . No incoming gas or too low gas pressure. 2. Gas control knob set to wrong position. 3. Pilot light button not being fully depressed when attempting to light pilot. 4. Pilot orif ice or pilot tube is obstructed or kinked. 5. Pilot electrode not sparking to pilot. 6. Piezo ig ...
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Bradford-White Corp M430T*F(BN - page 5
SERVICE PROCEDURE RG-I Inner Door/Gask et Remo v al, Inspection R eplacement and R einstallation Inner Door Remo v al Pr ocedur e St ep 1 . R otate knob of the combination thermostat/g as valve to the “OFF” position. St ep 2. R emov e outer jack et burner access door St ep 3. Inner Door Remov al. a) Disconnect resettable thermal switc h wire le ...
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Bradford-White Corp M430T*F(BN - page 6
6 SERVICE PROCEDURE RG-I Inner Door/Gask et Remo v al, Inspection R eplacement and R einstallation Ins t allation of Inner Door wit h Gask et St ep 7 . Clean an y residual gask et residue or other debris from combustion chamber sur face before installing the inner door/gask et assembly . St ep 8. Place the lef t side inner door into position fir st ...
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Bradford-White Corp M430T*F(BN - page 7
7 SERVICE PROCEDURE RG-I Inner Door/Gask et Remo v al, Inspection R eplacement and R einstallation St ep 1 0. Firmly place right side inner door flange agains t the lef t side inner door f lange and secure with two 1/4” drive screws from step 3c. DO NOT O VER TIGHTEN SCREWS. St ep 1 1 . Align right side inner door to combustion chamber and verify ...
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Bradford-White Corp M430T*F(BN - page 8
8 SERVICE PROCEDURE RG-II Thermocouple T esting and Replacement Closed Cir cuit Ther mocouple T es ting St ep 1 . Disconnect thermocouple from combination thermostat/g as valve. St ep 2. Connect a thermocouple adapter (BWC P/N 239-44642-00, R ober tshaw P/N 75036) at the thermocouple location in the combination thermostat/g as valve. St ep 3. R eco ...
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Bradford-White Corp M430T*F(BN - page 9
9 SERVICE PROCEDURE RG-II Thermocouple T esting and Replacement Ther mocouple R eplacement St ep 1 . T ur n of f gas supply to water heater . Rotat e knob of combination thermostat/g as valve to “OFF” position. St ep 2. Remo ve outer jack et door . St ep 3. R emov e right side of inner door per SERVICE PROCEDURE RG-I, st eps 3a through 3c. St e ...
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Bradford-White Corp M430T*F(BN - page 10
10 SERVICE PROCEDURE RG-III Pilot Assembly Inspection, Cleaning and R eplacement Pilot/Electr ode Assembly Inspection, Cleaning and Replacement St ep 1 . T ur n of f gas supply to water heater . Rotat e knob of combination thermostat/g as valve to “OFF” position. St ep 2. Remo ve outer jack et door . St ep 3. R emov e right side of inner door p ...
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Bradford-White Corp M430T*F(BN - page 11
11 SERVICE PROCEDURE RG-IV Piezo Igniter , Electrode T esting and Replacement Piezo Ignit er , Electrode T esting and R eplacement With the pilot not in operation (no pilot f lame) y ou can check the Piezo and electrode circuit by viewing pilot thru the sight glass located on the inner door and observing the spark action. St ep 1 . Remo ve outer ja ...
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Bradford-White Corp M430T*F(BN - page 12
Combination Ther mos t at/Gas V al v e T esting and R eplacement The combination thermostat/gas valve is a non repairable device. If trouble shooting has determined a problem with the combination thermostat/g as valve, it must be replaced. If the bur ner and/or pilot do not function, service chec ks for gas pressure, thermocouple output, magnet ass ...
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Bradford-White Corp M430T*F(BN - page 13
THERMOC OUPLE TES TIN G See SERVICE PROCEDURE II MA GNET ASSEMBL Y TES TIN G St ep 1 . Disconnect thermocouple from combination thermostat/g as valve. St ep 2. Connect a thermocouple adapter (BWC P/N 239-44642-00, Robertshaw P/N 75036) at the thermocouple location in the combination thermostat/g as valve. St ep 3. R econnect thermocouple to adapter ...
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Bradford-White Corp M430T*F(BN - page 14
C OMBIN A TION THERMOS T A T/GAS V AL VE REPL A CEMENT St ep 1 . R otate knob of the combination thermostat/g as valve to the “OFF” position. St ep 2. T ur n of f gas supply to water heater . St ep 3. Disconnect gas supply line from combination thermostat/g as valve. St ep 4. T ur n of f water supply and drain water heater completely . St ep 5. ...
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Bradford-White Corp M430T*F(BN - page 15
15 St ep 7 . R emov al of combination thermostat/g as valve. a) Disconnect main bur ner feedline (3/4” wrench), pilot tube (7/1 6" wrench) and thermocouple (3/8" wrench) from combination thermostat/g as valve & remov e from the combustion chamber . b) R emov e Piezo brack et with Piezo igniter (refer to SERVICE PROCEDURE RG-IV) from ...
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Bradford-White Corp M430T*F(BN - page 16
St ep 9. R einstallation of inner door assembly . (cont.) b) Clean any gask et residue or other debris from combustion chamber surface before installing the inner door/gask et assembly . c) P osition thermocouple, pilot tube and Piezo wire against lef t side inner door flange gask et. DO N O T R OUTE THR OUGH R ADIUSED CHANNEL WITH FEEDLINE. Be sur ...
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Bradford-White Corp M430T*F(BN - page 17
MAIN BURNER: Inspection, A djus tment, Cleaning and Replacement At periodic intervals (not more then 6 months) a visual inspection should be made of the main bur ner f or proper opera- tion and to insure no debris accumulating. Main burner should light smoothly from pilot and burn with a blue f lame with a minimum of yellow tips. St eel burner mode ...
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Bradford-White Corp M430T*F(BN - page 18
MAIN BURNER: Inspection, A djus tment, Cleaning and Replacement (cont.) St ep 3. Full y inspect inner gask et per SERVICE PROCEDURE RG-I, st ep 4. Replace gask et if required follo wing SERVICE PROCEDURE I, st eps 5 & 6. St ep 4. Be cer tain that thermocouple, pilot tube and Piezo wire are routed b y inner door f lange as shown and Reinstall in ...
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Bradford-White Corp M430T*F(BN - page 19
BURNER CLEANIN G (cont.) St ep 5. Disconnect (unscrew) main burner (stamped steel “B” bur ner) from main burner orif ice or on cast iron bur ners (“C” burner), loosen air shutter & disconnect (unscrew) feedline from burner . St ep 6. Remo ve main burner orif ice from feed line (1/2” wrench on steel burner , 3/8" wrench on cast ir ...
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Bradford-White Corp M430T*F(BN - page 20
RESETT ABLE THERMAL SWIT C H C ONTINUIT Y TES TIN G St ep 1 . Remo ve outer jack et door . St ep 2. Disconnect wire leads from resettable thermal switc h. St ep 3. Using a multimeter capable of measuring continuity (Ohms), place one probe of meter on one of the brass connection tabs of the resettable thermal switch, and the remaining probe on the o ...
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Bradford-White Corp M430T*F(BN - page 21
RESETT ABLE THERMAL SWIT C H REPL A CEMENT St ep 1 . R otate knob of combination thermostat gas valve to the of f position. St ep 2. Remo ve outer jack et door . St ep 3. Disconnect wire leads from resettable thermal switc h. St ep 4. R emov e resettable thermal switc h from inner door (Phillips screw driver). St ep 5. Place new resettable thermal ...
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Bradford-White Corp M430T*F(BN - page 22
Scr eenLok Flame Ar r es t or Cleaning St ep 1 . R otate knob of combination thermostat gas valve to the of f position. St ep 2. Remo ve outer jack et door . St ep 3. Remo ve inner door per SERVICE PROCEDURE RG-I, st ep 3a through 3e. St ep 4. Disconnect main bur ner feed line (3/4 wrench), pilot tube (7/1 6 wrench) and thermocouple (3/8) wrench fr ...
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Bradford-White Corp M430T*F(BN - page 23
23 Dip T ube Inspection and R eplacement St ep 1 . R otate knob of combination thermostat/gas valve to “OFF” position. St ep 2. T ur n of f c old water supply to heater . Connect hose to drain spigot of wat er heater and rout e to an open drain. Open a nearby hot water faucet to vent heater f or draining. Open drain spigot of water heater and a ...
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Bradford-White Corp M430T*F(BN - page 24
24 Anode Inspection and R eplacement St ep 1 . T ur n of f water supply to water heater . Rotat e knob of combination thermostat/g as valve to “OFF” position. St ep 2. T ur n of f c old water supply to heater . Connect hose to drain spigot of wat er heater and rout e to an open drain. Open a nearby hot water faucet to vent heater f or draining. ...
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Bradford-White Corp M430T*F(BN - page 25
25 1 Draf t Hood 2 Hot Water Outlet/Anode 3 Cold Water Inlet T ube 4 Flue Baf f le 5 T&P Relief Valv e 6 Thermostat 7 Piezo Igniter 8 Brass Drain Valv e 9 Screw -#8- 1 8 x 3/4 Hex Washer Head 1 0 Screw -#1 0- 1 2 x 3/4 Hex Washer Head 1 1 Lef t Side Inner Door with Gasket 1 2 Complete Right Side Inner Door 1 2A Right Side Inner Door with Gasket ...
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Bradford-White Corp M430T*F(BN - page 26
26 Notes ...
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Bradford-White Corp M430T*F(BN - page 27
27 Notes ...
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Bradford-White Corp M430T*F(BN - page 28
Sales/ 800-523-2931 Fax/ 215-641-1670 Technical Support/ 800-334-3393 Fax/ 269-795-1089 W arranty/ 800-531-2111 Fax/ 269-795-1089 International: T elephone/ 215-641-9400 T elefax/ 215-641-9750 Ambler , P A 888-538-7833 Fax on Demand: bradfor dwhite.com www. For U.S. and Canada field service, contact your professional installer or local Bradford Whi ...
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