A.O. Smith 974 Series Parts list
Contents
1. A O Smith A G a Water Heaters COMMERCIAL WATER HEATER PARTS LIST Model BTH 300A POWERED ANODE ASSEMBLY Model BTH 400A See Page 8 Series 974 975 OPERATING CONTROL WIRING See Page 4 CYCLONE XHE MODEL BTH 300A 400A See Page 2 GAS VALVE See Page 5 JO RECIRCULATING SYSTEM See Page 5 BLOWER BURNER ASSEMBLY See Page 7 EXHAUST ELBOW VENT KIT amp BLOWER INTAKE PARTS See Page 6 CONTROL PANEL See Page 3 PRINTED IN THE U S A 0206 PART NO 197177 001 CYCLONE XHE BTH 300A 400A PARTS LIST SEE DETAIL 5 BTH 300A BTH 400A Item Description 974 975 974 975 1 Cleanout Gasket Cover Cleanout Cover Left Cover Right 194749 Drain Valve 26273 4 Labels 800 Help Line Cleanout Electronic Ignition Flammable Vapors Lighting amp Operating Relief Valve Ultra Coat Warning Water Inlet Water Outlet Wiring Diagram 194772 194772 Panel Back 194750 194750 Temperature and Pressure Relief Valve 99383 3 99383 3 NOTE Underlined parts are recommended stock items for emergency replacement Consider gas used in your area only Not illustrated Standard hardware items may be purchased locally CLEAN OUT ASSEMBLY Item CYCLONE2. LS LAS N 0 SEE BLOWER BURN ASSEMBLY ON PAGE 7 Description Pump Recirculation Elbow 3 4 Male 1 Female Di Electric Union Vent Automatic Air Tube Inlet Tube Closed End Dip Item RECIRCULATING SYSTEM DETAIL 4 GAS VALVE Description Nipple 3 4 Pipe Nipple 1 8 Pipe Pipe Union Switch Low Gas Pressure Tee Non Reducing Valve NAT Gas Valve LP Gas Orifice NAT Orifice LP 8 Orifice holder BTH 300A 974 975 300 974 975 85040 18 192948 2 194536 5 194536 6 192477 268 192477 185 BTH 400A 974 975 BTH 400A 974 975 85040 18 192948 2 95515 191149 6 191149 4 194536 5 194536 6 192477 304 192477 221 192447 EXHAUST ELBOW VENT KIT amp BLOWER INTAKE PARTS Item Description EXHAUST ELBOW AND FITTINGS 1 Adapter Hose Fitting Elbow 90 Nipple Pipe Closed Plug Hex Connector Exhaust Hose Clamp 3 Hose Clamp 4 5 VENT KIT PARTS 10 Elbow w Screen 11 Intake Terminal 12 Wall Plates 2 Req d 13 Silicone Sealer 2 oz tube BLOWER INTAKE PARTS 14 Coupling 15 Hose Clamp Tube Intake Vent Terminal Intake Dash number indicates inches Not Illustrated 2 300 974 975 182094 194838 194923 196745 400 974 975 192472 195294 192697 192815 181564 182094 195736 BLOWER BURNER ASSEMBLY BTH 300A BTH 400A Description 974 975 974
3. XHE BTH 300A 400A CONTROL PANEL BTH300A BTH400A Description 974 975 974 975 Board Display Panel Bracket Mounting Left 194123 1 194123 1 Bracket Mounting Right 194123 194123 Control Board Cable Assembly includes 4 amp 4A Control Board Cable Assembly Junction Box Assembly Junction Box Cover Label Display Panel Label Led Panel Front Screw Plastic Switch Off On Splatter Shield ES X TRA HIGH EFFICIENCY o CYCLONE XHE BTH 300A 400A OPERATING CONTROLS amp WIRING See Next Page BTH 300A BTH 400A Item Description 974 975 974 975 Cable Assembly Power Switch 194785 Blower Prover Air Switch 195013 Box Anode 194857 Box Junction 194126 Cable Assembly Low Voltage 194918 Wire Harness 194783 Cable Assembly Controls 194784 Wire Assembly Air Flow Switch 192802 2 Wire Assembly Air Flow Switch 192802 1 Control Board Cable Assembly Includes Item 11 amp 11A 195018 11 Control Board 195010 11A Cable Assembly 194809 12 Display Board 194808 13 Electronic Control 14 Probe Upper 15 Probe Lower 16 Switch Blocked Inlet 17 Switch Blocked Outlet NAT Switch Blocked Outlet LP 18 Pump Recirculation 19 Switch On Off 20 Switch NAT Low Gas Pressure Switch LP Low Gas Pressure 21 Transformer 22 Valve Natural Gas 22 Valve LP Gas 23 Tubing 1 4 ID PVC 24 Cable Assembly Igniter ADN DETAIL 2 CYCLONE XHE BTH 300A 400A CONNECTIONS Continued
4. 975 Blower Motor Assembly Flange Burner Gasket Burner Gasket Viewport Screw 8 18 x 1 2 Screw Socket Head Cap Screw Truss Hd Mach 1 4 20 x 2 00 194816 Sensor Flame 194776 1 Window Observation Hex Nut POWERED ANODE ASSEMBLY Item Description 1 2 3 4 Anode Wire 28 Control Box LED w Lead Wire A O Smith A O Smith Water Heater Parts Fulfillment 125 Southeast Parkway Franklin TN 37068 1 800 433 2545 www hotwater com BTH 300A 974 975 BTH 400A 974 975
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