A.O. Smith 975, 974 User Manual

POWERED ANODE ASSEMBLY

See Page 8

CYCLONE XHE - MODEL BTH-300A/400A

GAS VALVE

See Page 5

COMMERCIAL WATER HEATER PARTS LIST

Model BTH-300A

Model BTH-400A

Series 974/975

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 THE U.S.A. 0206 PART NO. 197177-001

CYCLONE XHE BTH 300A/400A - PARTS LIST

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

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.

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

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