A.O. Smith 975 Series User Manual

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COMMERCIAL WATER HEATER PARTS LIST

Model BTH-300A

Model BTH-400A

POWERED ANODE ASSEMBLY Series 974/975

See Page 8

OPERATING CONTROL WIRING

See Page 4

CYCLONE XHE - MODEL BTH-300A/400A

See Page 2

GAS VALVE

See Page 5

RECIRCULATING SYSTEM

See Page 5

BLOWER/BURNER ASSEMBLY

See Page 7

CONTROL PANEL

EXHAUST ELBOW, VENT KIT & BLOWER

See Page 3

INTAKE PARTS

 

See Page 6

PRINTED IN THE U.S.A. 0206

1

PART NO. 197177-001

CYCLONE XHE BTH 300A/400A - PARTS LIST

 

 

BTH 300A

BTH 400A

 

 

Item

Description

974/975

974/975

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 .....

184872-000 ..

184872-000

 

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

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.

2

CYCLONE XHE BTH 300A/400A - CONTROL PANEL

 

 

BTH300A

BTH400A

 

 

Item

Description

974/975

974/975

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

12

Splatter Shield ....................................

197117-000

 

CYCLONE XHE BTH 300A/400A - OPERATING CONTROLS & WIRING (See Next Page)

 

 

BTH 300A

BTH 400A

 

 

Item

Description

974/975

974/975

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 .............................................................................................

192606 ...........

192606

15

Probe, Lower .............................................................................................

192609 ...........

192609

16

Switch, Blocked Inlet .................................................................................

194911 ...........

195012

17

Switch, Blocked Outlet - NAT ....................................................................

194910 ...........

194910

 

Switch, Blocked Outlet - LP .......................................................................

195017 ...........

195017

18

Pump, Recirculation ..................................................................................

196915 ...........

196915

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

3

DETAIL 2 - CYCLONE XHE BTH 300A/400A - CONNECTIONS (Continued)

4

RECIRCULATING SYSTEM

 

 

BTH 300A

BTH 400A

 

 

Item

Description

974/975

974/975

1

Pump, Recirculation ...............................................................................

196915 ................

196915

2

Elbow, 3/4" Male - 1" Female .................................................................

194872 ................

194872

3

Di-ElectricUnion .....................................................................................

196941 ................

196941

4

Vent, Automatic Air .................................................................................

194830 ................

194830

5

Tube, Inlet ..............................................................................................

194820 ................

194820

6

Tube, Closed End Dip ............................................................................

194924 ................

194924

DETAIL 4 - GAS VALVE

 

Item

Description

BTH 300A

BTH 400A

 

 

974/975

974/975

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 .............................................

192477-268 ..

192477-304

 

 

Orifice, LP ...............................................

192477-185 ..

192477-221

8

Orifice holder ...............................................

192447 ..........

192447

Standard hardware items may be purchased locally.

5

EXHAUST ELBOW, VENT KIT & BLOWER INTAKE PARTS

 

 

BTH 300A

BTH 400A

 

 

Item

Description

974/975

974/975

EXHAUST ELBOW AND FITTINGS

 

 

1

Adapter, Hose Fitting .......................................................................................................

192472 .............

192472

2

Elbow, 90° .......................................................................................................................

195294 .............

195294

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 .............

192815

11

Intake Terminal ...............................................................................................................

182167 .............

182167

12

Wall Plates (2 Req'd) .......................................................................................................

181557 .............

181557

13

Silicone Sealer, 2 oz. tube ...............................................................................................

181564 .............

181564

BLOWER INTAKE PARTS

 

 

14

Coupling ..........................................................................................................................

182094 .............

182094

15

Hose Clamp.....................................................................................................................

194838 .............

194838

16

Tube, Intake ....................................................................................................................

194923 .............

194923

17

Vent Terminal, Intake ......................................................................................................

196745 .............

195736

 

# Dash number indicates inches.

 

 

 

* Not Illustrated.

 

 

11

12

17

16

15

14

15

13

6

BLOWER/BURNER - ASSEMBLY

 

 

BTH 300A

BTH 400A

 

 

Item

Description

974/975

974/975

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, #8-18x 1/2 ..............................................................................

192698 ................

192698

9

Screw, Socket Head Cap ....................................................................

192515 ................

192515

10

Screw, Truss Hd. Mach 1/4-20x 2.00 . ...............................................

194816 ................

194816

11

Sensor, Flame ...................................................................................

194776-1 ............

194776-1

12

Window, Observation .........................................................................

98758-3 ..............

98758-3

13

Hex Nut ...............................................................................................

196882 ................

196882

Standard hardware items may be purchased locally.

7

POWERED ANODE ASSEMBLY

 

 

BTH 300A

BTH 400A

 

 

Item

Description

974/975

974/975

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 Heater Parts Fulfillment

125 Southeast Parkway

Franklin, TN 37068

1-800-433-2545

www.hotwater.com

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