BTH 300A - AO Smith Water Heaters

PSD-3-443/cPOWERED ANODE ASSEMBLYSee Page 8COMMERCIAL WATER HEATER PARTS LISTMODEL BTH-300ASERIES 970/971MODEL BTH-400ASERIES 970OPERATING CONTROL WIRINGSee Page 4CYCLONE XHE - MODEL BTH-300A/400ASee Page 2GAS VALVESee Page 5RECIRCULATING SYSTEMSee Page 5BLOWER/BURNER ASSEMBLYSee Page 7CONTROL PANELSee Page 3EXHAUST ELBOW, VENT KIT & BLOWERINTAKE PARTSSee Page 6PRINTED IN U.S.A. 0604 1195788-001

CYCLONE XHE BTH 300A/400A - PARTS LISTBTH 300A BTH 400AItem Description 970/971 970/9711 Cleanout Gasket.............. 99038 ............ 990382 Cover, Cleanout ............... 99037 ............ 990373 Cover, Left ...................... 194748 .......... 1947484 Cover, Right .................... 194749 .......... 1947495 Drain Valve ..................... 26273-4 ........ 26273-47 Labels:800 Help Line ................. 190600 .......... 190600C.E.C. ............................. 42985 ............ 42985Cleanout .......................... 78754 ............ 78754ECO .............................. 192282-1 ...... 192282-1Electronic Ignition ............ 77860 ............ 77860Flammable Vapors ......... 193302 .......... 193302Lighting & Operating ....... 194548 .......... 194548Relief Valve ..................... 191068 .......... 191068UL................................... 192870 .......... 192870Ultra Coat ....................... 193860 .......... 193860Warning .......................... 193912 .......... 193912Water Inlet ....................... 94519 ............ 94519Water Outlet .................... 94518 ............ 94518Wiring Diagram ............... 194772 .......... 1947728 Panel, Back.................... 194750 .......... 1947509 Temperature andPressure Relief Valve ...... 99383-3 ........ 99383-3NOTE: Underlined parts are recommendedstock items for emergency replacement.Consider gas used in your area only.*Not illustrated.Standard hardware items may bepurchased locally.2

CYCLONE XHE BTH 300A/400A - CONTROL PANELBTH300A BTH400AItem Description 970/971 970/9711 Board, Display Panel ............................ 194808 ............ 1948082 Bracket, Mounting Left ......................... 194123-1 ......... 194123-13 Bracket, Mounting Right........................ 194123 ............ 194123Control Board, Cable Assembly(includes 4 & 4A) .................................. 194811 ............ 1950184 Control Board ..................................... 194812 ............ 1950104A Cable Assembly ................................ 194809 ............ 1948095 Junction Box Assembly ........................ 194126 ............ 1941266 Junction Box Cover ................................. 2233 ............... 22337 Label, Display Panel ............................. 194203 ............ 1942038 Label, Led ............................................. 194915 ............ 1949159 Panel Front ........................................... 193884 ............ 19388410 Screw, Plastic....................................... 194202 ............ 19420211 Switch,Off/On ........................................ 193243 ............ 193243CYCLONE XHE BTH 300A/400A - OPERATING CONTROLS & WIRING (See Next Page)BTH 300A BTH 400AItem Description 970/971 970/9711 Cable Assembly, Power Switch ..................................................................194785............ 1947852 Blower Prover Air Switch .............................................................................194706............ 1950133 Box, Anode .................................................................................................194857............ 1948574 Box, Junction ..............................................................................................194126............ 1941265 Cable Assembly, Low Voltage ....................................................................194918............ 1949187 Wire Harness ..............................................................................................194783............ 1947838 Cable, Assembly - Controls ........................................................................194784............ 1947849 Wire Assembly - Air Flow Switch.............................................................. 192802-2 ......... 192802-210 Wire Assembly - Air Flow Switch............................................................. 192802-1 ......... 192802-1Control Board, Cable Assembly (Includes Item 11 & 11A) ..........................194811............ 19501811 Control Board ...........................................................................................194812............ 19501011A Cable Assembly ......................................................................................194809............ 19480912 Display Board .............................................................................................194808............ 19480813 Electronic Control .......................................................................................194747............ 19474714 Probe, Upper ...............................................................................................196597............ 19659715 Probe, Lower ...............................................................................................196598............ 19659816 Switch, Blocked Inlet ..................................................................................194911............ 19501217 Switch, Blocked Outlet - NAT .....................................................................194910............ 194910Switch, Blocked Outlet - LP ........................................................................195017............ 19501718 Pump, Recirculation ....................................................................................194799............ 19479919 Switch, On/Off.............................................................................................193243............ 19324320 Switch, NAT, Low Gas Pressure............................................................. 191149-6 ......... 191149-6Switch, LP ,Low Gas Pressure ................................................................. 191149-4 ......... 191149-421 Transformer .................................................................................................192608............ 19260822 Valve, Natural Gas .................................................................................... 194536-5 ......... 194536-522 Valve, LP Gas ........................................................................................... 194536-6 ......... 194536-623 Tubing, 1/4" ID, PVC ...................................................................................193738............ 19373824 Cable Assembly, Igniter ..............................................................................194937............ 1949373

DETAIL 2 - CYCLONE XHE BTH 300A - CONNECTIONS (Continued)4

RECIRCULATING SYSTEMBTH 300A BTH 400AItem Description 970/971 970/9711 Elbow, 3/4" Female - 3/4" Female........................................................... 194873 ................. 1948732 Elbow, 3/4" Male - 1" Female ................................................................. 194872 ................. 1948723 Hose, Flexible ......................................................................................... 194912 ................. 1949124 Nipple, 3/4" - Pipe x 2" ........................................................................... 194921-3 ..............194921-35 Nipple, 3/4" - Pipe x 4" ........................................................................... 194921-2 ..............194921-26 Nipple, 3/4" - Pipe x close ..................................................................... 194921-1 ..............194921-17 Pump, Recirculation ................................................................................ 194799 ................. 1947998 Tee, Non-Reducing .................................................................................. 194870 ................. 1948709 Tube, Closed End Dip ............................................................................. 194924 ................. 19492410 Tube, Inlet ............................................................................................... 194820 ................. 19482011 Vent, Automatic Air ................................................................................ 194830 ................. 194830Standard hardware items may be purchased locally.DETAIL 4 - GAS VALVEBTH 300A BTH 400AItem Description 970/971 970/9711 Nipple, 3/4" - Pipe ...................................... 85040-18 ........ 85040-182 Nipple, 1/8" - Pipe ...................................... 192948-2 ........ 192948-23 Pipe, Union ................................................... 95515 ............ 955154 Switch, Low Gas Pressure ......................... 191149-6 ........ 191149-6LP Gas .................................................... 191149-4 ....... 191149-45 Tee, Non-Reducing ........................................ 40119 ............ 401196 Valve, NAT Gas ......................................... 194536-5 ........ 194536-5Valve, LP Gas ............................................ 194536-6 ........ 194536-67 Orifice, NAT ............................................... 192477-7 ......... 192477Orifice, LP .................................................. 192477-8 ........ 192477-98 Orifice holder ................................................ 192447 .......... 192447Standard hardware items may be purchased locally.5

EXHAUST ELBOW, VENT KIT & BLOWER INTAKE PARTSBTH 300A BTH 400AItem Description 970/971 970/971EXHAUST ELBOW AND FITTINGS1 Adapter, Hose Fitting ....................................................................................................... 192472 .............. 1924722 Elbow, 90° ....................................................................................................................... 194836 .............. 1948363 Nipple, Pipe, Closed ........................................................................................................ 194558 .............. 1945884 Plug, Hex ......................................................................................................................... 194560 .............. 1945605 Tee................................................................................................................................... 194559 .............. 1945596 Tubing ............................................................................................................................ 191746-72 ........ 191746-727 Connector, Exhaust ......................................................................................................... 192636 .............. 1926368 Hose Clamp, 3"................................................................................................................ 192696 .............. 1926969 Hose Clamp, 4.5" ............................................................................................................. 192697 .............. 192697VENT KIT PARTS10 Elbow w/Screen ............................................................................................................... 192815 .............. 19500911 Elbow, 45° x 3.5" dia........................................................................................................ 181901 .............. 18190112 Screen ............................................................................................................................. 181662 .............. 19500813 Intake Terminal ................................................................................................................ 182167 .............. 18216714 Wall Plates (2 Req'd) ....................................................................................................... 181557 .............. 18155715 Silicone Sealer, 2 oz. tube ............................................................................................... 181564 .............. 181564BLOWER INTAKE PARTS16 Coupling ........................................................................................................................... 182094 .............. 18209417 Hose Clamp ..................................................................................................................... 194838 .............. 19483818 Tube, Intake ..................................................................................................................... 194923 .............. 19492319 Vent Terminal, Intake ....................................................................................................... 192815 .............. 192815# Dash number indicates inches.* Not Illustrated.192815 1950096

BLOWER/BURNER - ASSEMBLYBTH 300A BTH 400AItem Description 970/971 970/9711 Burner .................................................................................................. 194779 ................ 1949982 Blower/Motor Assembly ....................................................................... 194746 ................ 1947463 Flange-Burner ...................................................................................... 194960 ................ 1949604 Gasket ................................................................................................. 194817 ................ 1948175 Gasket, Burner .................................................................................... 194777 ................ 1950166 Gasket-Viewport .................................................................................. 194827 ................ 1948277 Ignitor ................................................................................................... 192334 ................ 1923348 Screw, #8-18 x 1/2 ............................................................................... 192698 ................ 1926989 Screw, Socket Head Cap ..................................................................... 192515 ................ 19251510 Screw, Truss Hd. Mach 1/4-20 x 2.00 . ................................................ 194816 ................ 19481611 Sensor, Flame ....................................................................................194776-1 .............194776-112 Window, Observation ...........................................................................98758-3 .............. 98758-3Standard hardware items may be purchased locally.7

POWERED ANODE ASSEMBLYBTH 300A BTH 400AItem Description 970/971 970/9711 Anode .........................................................................................................194787 ............1947872 Anode Wire, 28"..........................................................................................194925 ............1949253 Control Box .................................................................................................194857 ............1948574 LED w. Lead Wire .......................................................................................194959 ............194959A.O. SMITH WATER PRODUCTS COMPANY5621 W. 115TH STREET • ALSIP, ILLINOIS 60803PHONE: 1-800-433-2545 • FAX: 1-800-433-2515Website: www.hotwater.com • E-mail: www.hotwater.com/parts8