Page 1
POWERED ANODE ASSEMBLY
See Page 8
CYCLONE XHE - MODEL BTH-300A/400A
GAS VALVE
See Page 5
PSD-3-443/c
COMMERCIAL WATER HEATER PARTS LIST
MODEL BTH-300A
SERIES 970/971
MODEL BTH-400A
SERIES 970
OPERATING CONTROL WIRING
See Page 4
See Page 2
BLOWER/BURNER ASSEMBLY
See Page 7
CONTROL PANEL
See Page 3
RECIRCULATING SYSTEM
See Page 5
EXHAUST ELBOW, VENT KIT & BLOWER
INTAKE PARTS
See Page 6
PRINTED IN U.S.A. 0604 195788-001
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CYCLONE XHE BTH 300A/400A - PARTS LIST
Item Description 970/971 970/971
1 Cleanout Gasket .............. 99038 ............ 99038
2 Cover, Cleanout ............... 99037 ............ 99037
3 Cover, Left ...................... 194748 .......... 194748
4 Cover, Right .. ............ ...... 194749 .......... 194749
5 Drain Valve ..................... 26273-4 ........ 26273-4
7 Labels:
800 Help Line ................. 190600 .......... 190600
C.E.C. ............................. 42985 ............ 42985
Cleanout .......................... 78754 ............ 78754
ECO .............................. 192282-1 ...... 192282-1
Electronic Ignition ............ 77860 ............ 77860
Flammable Vapors ......... 193302 .......... 193302
Lighting & Operating ....... 194548 .......... 194548
Relief Valve ..................... 191068 .......... 191068
UL................................... 192870 .......... 192870
Ultra Coat ....................... 193860 .......... 193860
Warning .......................... 193912 .......... 193912
Water Inlet ....................... 94519 ............ 94519
Water Outlet .................... 94518 ............ 94518
Wiring Diagram ............... 194772 .......... 194772
8 Panel, Back .................... 194750 .......... 194750
9 Temperature and
Pressure Relief Valve ...... 99383-3 ........ 99383-3
BTH 300A BTH 400A
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.
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Page 3
CYCLONE XHE BTH 300A/400A - CONTROL PANEL
BTH300A BTH400A
Item Description 970/971 970/971
1 Board, Display Panel ............................ 194808 ............ 194808
2 Bracket, Mounting Left ......................... 194123-1 ......... 194123-1
3 Bracket, Mounting Right ........................ 194123 ............ 194123
Control Board, Cable Assembly
(includes 4 & 4A) .................................. 194811 ............ 195018
4 Control Board ..................................... 194812 ............ 195010
4A Cable Assembly ................................ 194809 ............ 194809
5 Junction Box Assembly ........................ 194126 ............ 194126
6 Junction Box Cover ................................. 2233 ............... 2233
7 Label, Display Panel ............................. 194203 ............ 194203
8 Label, Led ............................................. 194915 ............ 194915
9 Panel Front ........................................... 193884 ............ 193884
10 Screw, Plastic ....................................... 194202 ............ 194202
11 Switch,Off/On ........................................ 193243 ............ 193243
CYCLONE XHE BTH 300A/400A - OPERATING CONTROLS & WIRING (See Next Page)
BTH 300A BTH 400A
Item Description 970/971 970/971
1 Cable Assembly, Power Switch ..................................................................194785 ............ 194785
2 Blower Prover Air Switch ............................................................................. 194706............ 195013
3 Box, Anode .................................................................................................194857 ............ 194857
4 Box, Junction ..............................................................................................194126 ............ 194126
5 Cable Assembly, Low Voltage .................................................................... 194918 ............ 194918
7 Wire Harness ..............................................................................................194783 ............ 194783
8 Cable, Assembly - Controls ........................................................................ 194784 ............ 194784
9 Wire Assembly - Air Flow Switch .............................................................. 192802-2 ......... 192802-2
10 Wire Assembly - Air Flow Switch ............................................................. 192802-1 ......... 192802-1
Control Board, Cable Assembly (Includes Item 11 & 11A) .......................... 194811 ............ 195018
11 Control Board ...........................................................................................194812 ............ 195010
11A Cable Assembly ...................................................................................... 194809 ............ 194809
12 Display Board .............................................................................................194808 ............ 194808
13 Electronic Control ....................................................................................... 194747 ............ 194747
14 Probe, Upper ............................................................................................... 196597 ............ 196597
15 Probe, Lower ............................................................................................... 196598 ............ 196598
16 Switch, Blocked Inlet .................................................................................. 194911............ 195012
17 Switch, Blocked Outlet - NAT .....................................................................194910 ............ 194910
Switch, Blocked Outlet - LP ........................................................................195017 ............ 195017
18 Pump, Recirculation .................................................................................... 194799............ 194799
19 Switch, On/Off............................................................................................. 193243 ............ 193243
20 Switch, NAT, Low Gas Pressure ............................................................. 191149-6 ......... 191149-6
Switch, LP ,Low Gas Pressure ................................................................. 191149-4 ......... 191149-4
21 Transformer .................................................................................................192608 ............ 192608
22 Valve, Natural Gas .................................................................................... 194536-5 ......... 194536-5
22 Valve, LP Gas ........................................................................................... 194536-6 ......... 194536-6
23 Tubing, 1/4" ID, PVC ...................................................................................193738 ............ 193738
24 Cable Assembly, Igniter ..............................................................................194937 ............ 194937
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DETAIL 2 - CYCLONE XHE BTH 300A - CONNECTIONS (Continued)
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RECIRCULATING SYSTEM
BTH 300A BTH 400A
Item Description 970/971 970/971
1 Elbow, 3/4" Female - 3/4" Female ........................................................... 194873 ................. 194873
2 Elbow, 3/4" Male - 1" Female ................................................................. 194872 ................. 194872
3 Hose, Flexible......................................................................................... 194912 ................. 194912
4 Nipple, 3/4" - Pipe x 2" ........................................................................... 194921-3 .............. 194921-3
5 Nipple, 3/4" - Pipe x 4" ........................................................................... 194921-2 .............. 194921-2
6 Nipple, 3/4" - Pipe x close ..................................................................... 194921-1 .............. 194921-1
7 Pump, Recirculation ................................................................................ 194799 ................. 194799
8 Tee, Non-Reducing .................................................................................. 194870 ................. 194870
9 Tube, Closed End Dip ............................................................................. 194924 ................. 194924
10 Tube, Inlet ............................................................................................... 194820 ................. 194820
11 Vent, Automatic Air ................................................................................ 194830 ................. 194830
Standard hardware items may be purchased locally.
DETAIL 4 - GAS VALVE
Item Description 970/971 970/971
1 Nipple, 3/4" - Pipe ...................................... 85040-18 ........85040-18
2 Nipple, 1/8" - Pipe ...................................... 192948-2 ........192948-2
3 Pipe, Union ................................................... 95515 ............ 95515
4 Switch, Low Gas Pressure ......................... 191149-6 ........ 191149-6
LP Gas .................................................... 191149-4 ....... 191149-4
5 Tee, Non-Reducing ........................................ 40119 ............ 40119
6 Valve, NAT Gas ......................................... 194536-5 ........194536-5
Valve, LP Gas ............................................ 194536-6 ........ 194536-6
7 Orifice, NAT ............................................... 192477-7 ......... 192477
Orifice, LP .................................................. 192477-8 ........192477-9
8 Orifice holder ................................................ 192447 .......... 192447
Standard hardware items may be purchased locally.
BTH 300A BTH 400A
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EXHAUST ELBOW, VENT KIT & BLOWER INTAKE PARTS
BTH 300A BTH 400A
Item Description 970/971 970/971
EXHAUST ELBOW AND FITTINGS
1 Adapter, Hose Fitting ....................................................................................................... 192472 ..............192472
2 Elbow, 90° ....................................................................................................................... 194836 .............. 194836
3 Nipple, Pipe, Closed ........................................................................................................ 194558 .............. 194588
4 Plug, Hex ......................................................................................................................... 194560 .............. 194560
5 Tee ................................................................................................................................... 194559 .............. 194559
6 Tubing ............................................................................................................................ 191746-72 ........ 191746-72
7 Connector, Exhaust ......................................................................................................... 192636 .............. 192636
8 Hose Clamp, 3" ................................................................................................................ 192696 .............. 192696
9 Hose Clamp, 4.5" ............................................................................................................. 192697 .............. 192697
VENT KIT PARTS
10 Elbow w/Screen ............................................................................................................... 192815 .............. 195009
11 Elbow, 45° x 3.5" dia. ....................................................................................................... 181901 .............. 181901
12 Screen ............................................................................................................................. 181662 .............. 195008
13 Intake Terminal ................................................................................................................ 182167 .............. 182167
14 Wall Plates (2 Req'd) ....................................................................................................... 181557 .............. 181557
15 Silicone Sealer, 2 oz. tube ............................................................................................... 181564 .............. 181564
BLOWER INTAKE PARTS
16 Coupling ........................................................................................................................... 182094 .............. 182094
17 Hose Clamp ..................................................................................................................... 194838 .............. 194838
18 Tube, Intake ..................................................................................................................... 194923 .............. 194923
19 Vent Terminal, Intake ....................................................................................................... 192815 ..............192815
# Dash number indicates inches.
* Not Illustrated.
192815 195009
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BLOWER/BURNER - ASSEMBLY
BTH 300A BTH 400A
Item Description 970/971 970/971
1 Burner .................................................................................................. 194779 ................ 194998
2 Blower/Motor Assembly ....................................................................... 194746 ................ 194746
3 Flange-Burner ...................................................................................... 194960 ................ 194960
4 Gasket ................................................................................................. 194817 ................ 194817
5 Gasket, Burner .................................................................................... 194777 ................ 195016
6 Gasket-Viewport .................................................................................. 194827 ................ 194827
7 Ignitor ................................................................................................... 192334 ................ 192334
8 Screw, #8-18 x 1/2 ............................................................................... 192698 ................ 192698
9 Screw, Socket Head Cap ..................................................................... 192515 ................ 192515
10 Screw, Truss Hd. Mach 1/4-20 x 2.00 . ................................................ 194816 ................ 194816
11 Sensor, Flame ....................................................................................194776-1 ............. 194776-1
12 Window, Observation ........................................................................... 98758-3 .............. 98758-3
Standard hardware items may be purchased locally.
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POWERED ANODE ASSEMBLY
BTH 300A BTH 400A
Item Description 970/971 970/971
1 Anode .........................................................................................................194787 ............194787
2 Anode Wire, 28" ..........................................................................................194925 ............194925
3 Control Box .................................................................................................194857 ............194857
4 LED w. Lead Wire .......................................................................................194959 ............194959
A.O. SMITH WATER PRODUCTS COMPANY
5621 W. 115TH STREET • ALSIP, ILLINOIS 60803
Website: www.hotwater.com • E-mail: www.hotwater.com/parts
PHONE: 1-800-433-2545 • FAX: 1-800-433-2515
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