Bradford-White Corp MI75S*(BN manual

SERVICE MANUAL Atmospheric Gas Water Heaters Troublesh ooti ng Guide and Inst ructions for Ser vice (To be pe rf o rmed O NL Y b y quali fie d service pr o viders) Sa ve th is ma nual for fu ture r efere nce Manu al 2 3 8-46 64 7-0 0A Mode l s C ove re d by This Manu al : GX225S*B N GX155S*B N 25X78 B*N 55X80 B*N M1X R65T * ( BN,CX) MI7 5S*( BN,CX)[...]

T able of Contents Page Ser vi ce P rocedure Tr ou ble shoo t ing C har t 3 - - - Therm ocouple T es ting an d Repl acem e nt 4 A G- I Pilot Assembl y Ins pe ction Cle anin g a nd Re pla c ement 5 AG- II Co mbi nation T hermostat/ Ga s V alve Tes ting and Replac ement 6 A G-I II B urne r O pera tion Inspection , Ad jus tm e nt, Cle aning and R epla[...]

Troubleshooting Char t SYM PT OM PR OB A BL E CA US E CORR E CT IV E ACTION Pil ot w ill n o t li g ht 1 . No i n com ing g as or too l o w g as pr essu re. 2 . Gas c o ntro l k no b s et t o wr ong po siti o n. 3 . Pilot lig ht button n ot b ei ng f u lly d epr es sed whe n attem p ting t o li ght p ilot . 4. Pilot orifice o r pi lot tub e is o bs[...]

T HERMOCOU PLE REPL A CEMENT Step 1. T u rn off g as supply to wat er heater . Rota te kno b of combination ther mosta t/g as v al ve to “O F F” po sit ion. Step 2. R e move out er jacket door. Step 3. Slide open inner c omb ustion chambe r do or. Step 4 Disconne ct therm oc ouple from co m bination therm ostat/g as valve (3/8" w re n ch).[...]

PILO T ASSEM BLY INSP ECTION, CLEANING AND RE PLACEMENT Step 1. T u rn off g as supply to w ater he ater. Ro tate kn ob of co mb ination thermostat/gas valve to “OFF ” position. Step 2. R e move out er jacket door. Ste p 3. Sl id e op en in n er c omb ustion chambe r door. Step 4 Dis conne ct the rmocouple ( 3/8" w ren ch), pi l ot tube ( [...]

SERV IC E P ROCE DURE A G-III Combination Therm ostat/Gas Valve Tes ting an d Rep lacement T he c o mbi nation therm ostat/g as val ve i s a n on r epai rable dev ice . I f t rou ble s hootin g has det ermined a p roblem with the c om binat ion the rmostat /gas v alve, it mu st be r eplac ed. If the b urner a nd/or pi l ot d o n ot f un ction, serv[...]

See SE RVI CE PR OCEDURE AG -I TH ERMOCOUPLE TESTING M AGNET ASSEMBLY T E STI NG (Whi t e Rod g ers Control) SERV IC E P ROCE DURE A G-III Combination Therm ostat/Gas Valve Tes ting and Replacement Pa ge 7 Step 1. Follo wing the l ig hting instruction label o n the he ater, proceed t o light t he pilot an d allow to o perate f or thr ee m inutes . [...]

SERV IC E P ROCE DURE A G-III Combination Therm ostat/Gas Valve Tes ting an d Rep lacement COMBI NATION T HERMOSTAT/G AS VALVE RE PLA CEMENT Step 1 . R ot ate k no b of the c omb inat ion t her m ostat /gas val ve t o the “OFF” position. Step 2. T urn of f gas s upply to water heater. Step 3. Disconnect gas supply line from com binat io n therm[...]

SERV IC E P ROCE DURE A G-III Combination Therm ostat/Gas Valve Tes ting an d Rep lacement Step 7. Removal of combination th er mostat/gas valve. a ) Disconn ect mai n b urne r f e edl ine ( ¾” wren ch), p i lot tube (7 /16 " w rench) and th e rmoc oup l e (3/8 " w rench) fro m comb ina tion thermos tat/gas v alve & rem ove b urner[...]

Step 1 . W i th main burner in oper ati on sl ide the inner c omb ustion chambe r door open. Step 2 . To adjust for proper burning, loosen the air shutter nut, rotate the shutter to close the opening in the burner, then slowly rotate the shutter until the yellow tips are minimized. Tighten the air shutt er nu t. Too much air will cause the flame to[...]

St e p 3 . F u lly ins pect combu stion c hamb er for debris or car bon bui ld up. St e p 4. B urn er shoul d operat e as ad j usted in s tep 2, if no t, re peat p ro ced ure c ompensatin g air s hut ter position for prop er b urn er o pe ration with i nn er door close d. St e p 5 . I t m ay be necessar y to clean mai n bur ner or ma in burne r ori[...]

Step 5. Disconne ct (u nscrew) M ain bu r ner ( sta mped st ee l b urner) f rom main b urn er ori fice or o n ca st i r o n b urners, l oose n ai r s hutter & discon nect (unscrew) fee dlin e from burner. Step 6 . R e mo ve ma in burner ori fice fr om fee d line (½” wren ch o n steel b urn er, 3/8 " wrench o n cast iro n). I nspe ct and[...]

SER VICE PROC EDURE A G-V D ip Tube and A no de Ins pe ction and Re placemen t Page 13 St e p 1. R otat e kno b of c omb ina t io n t her m os ta t /ga s va l v e to “ O FF” p o sit i o n. St e p 2 . T u r n of f cold w ater suppl y t o heater. C onnec t h ose to d rai n spigot o f w ater he ater and r ou te to a n o p en drain. Op en a nea rb [...]

Step 1. T u rn of f water supply to wate r heater. R otat e kn ob o f c ombi nation therm o stat /gas val ve to “OF F” p osition. Step 2. T u rn of f cold water sup ply t o heater . C onnec t h ose to dr ain spigot o f water he ater a n d route to an o pen d rai n. Ope n a ne arby h ot w ate r f auc et t o v en t h e ate r f or dr ai ning. Open[...]

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