A. O. Smith CTG-40 Parts List

RESIDENTIAL WATER HEATERS

REPLACEMENT PARTS LIST

MODELS: PGCG 40 & 50

SERIES: 242 - 246

MODELS: CTG 40 & 50

SERIES: 246

BURNER ASSEMBLY

3/4" T&P RELIEF VALVE

AUTOMATIC, SELF-CLOSING TYPES

PART PRESS A = TEMP

NUMBER RELIEF

43151-2 150 LBS. 1 7/8" 210°

OUTER DOOR

CTG MODELS ONLY

PRINTED IN U.S.A. 0106 PART NO. 185505-000

Item Qty. Description PGCG 40 PGCG 40 PGCG 40 PGCG 50 PGCG 50 PGCG 50 CTG 40 CTG 50

222-226 246 223-227 222-226 246 223-227 226 226

Natural Natural Propane Natural Natural Propane Natural Natural

1.. 1 ... Anode................................ 183523-39 .. 183523-39 ... 183523-39.... 183523-39 ...183523-39..... 183523-39 .... 183523-39 .. 183523-39

2 .. 1 ... Flue Baffle ............................. 181589 ........ 181589 .........181589 ......... 181589......... 181589 .......... 181589.......... 181589 ........ 181589

3 .. 1 ... Hanger, Flue Baffle ...............181360 ........ 181360 .........181360 ......... 181360......... 181360 .......... 181360.......... 181360 ........ 181360

4 .. 1 ... Restrictor, Flue Baffle ............34894 .......... 34894 ...........34894 ........... 34894...........34894 ............ 34894............ 34894 .......... 34894

5 .. 1 ... Main Burner Ass’y. ................ 181670 ........ 181670 ....... OBSOLETE .........181670-2 ..... 181670-2 ........ OBSOLETE ........... 183003 ...... 183003-1

6 .. 1 ... Air Shutter ............................. 181673 ........ 181673......... 181673 ......... 181673.........181673 .......... 181673 ..........181673 ........ 181673

7 .. 1 ... Main Burner ...........................181654 ........ 181654.........181654 ......... 181654.........181654 .......... 181654 ..........181654 ........ 181654

8 .. 1 ... Pilot Burner Ass’y. ............... 181696-2..... 181696-2 ..... 181696-1...... 181696-2 .....181696-2 ....... 181696-1 ........183004 ........ 183004

9 .. 1 ... Nut, Air Shutter .................... 181665-1..... 181665-1 ..... 181665-1...... 181665-1 ..... 181665-1....... 181665-1 ...... 181665-1 .... 181665-1

10 .. 1 ... Orifice, Main Burner ........... 181508-32... 181508-32 ...181791-52.... 181508-32 ...181508-32..... 181791-52 .... 181508-32 .. 181508-32

11.. 1 ... Thermocouple ........................23673 .......... 23673 ...........23673 ........... 23673 ...........23673 ............ 23673 ............23673 .......... 23673

12 .. 1 ... Tube, Main Burner.................181663 ........ 181663 ....... OBSOLETE ......... 181663-1 ..... 181663-1........ OBSOLETE ........... 181663 ...... 181663-1

13 .. 1 ... Pilot Tube ................................23330 .......... 23330...........23330 ........... 23330...........23330 ............ 23330............ 23330 .......... 23330

14 .. 1 ... Nut, Compression...................32365 .......... 32365...........32365 ........... 32365...........32365 ............ 32365............ 32365 .......... 32365

15 .. 1 ... Dirt Leg Ass’y ........................ - - - - - .......... - - - - - .........181206 ..........- - - - - ......... - - - - - ........... 181206 .......... - - - - - .......... - - - - -

16 .. 1 ... Door Hinge............................. - - - - - ..........- - - - - ......... - - - - - ...........- - - - - ......... - - - - - ............ - - - - - ..........181453 ........ 181453

17 .. 1 ... Inner Door Ass’y ................... 181667 ........ 181667 .........181667 ......... 181667.........181667 .......... 181667.......... 181667 ........ 181667

18 .. 1 ... Outer Door.............................181650 ........ 181650 .........181650 ......... 181650.........181650 .......... 181650 ........ 181650-1 .... 181650-1

19 .. 1 ... Draft Hood ......................... 181082-700. 181082-700 .181082-700.. 181082-700 . 181082-700... 181082-700 .. 181082-700 181082-700

20 .. 1 ... Outlet Heat Trap ....................181235 ........ 181235 .........181235 ......... 181235 .........181235 .......... 181235.......... - - - - - .......... - - - - -

21 .. 1 ... Instruction Manual*................182583 ........ 183392 .........182583 ......... 182583.........183392 .......... 182583.......... 183558 ........ 183558

LABELS

22 .. 1 ... Ligting & Operating................182557 ........ 182796 .........182557 ......... 182557 .........182796 .......... 182557.......... 183002 ........ 183002

23 .. 1 ... Warning, Flammable*.............183300 ........ 183300 .........183300 ......... 183300 .........183300 .......... 183300.......... 183300 ........ 183300

24 .. 1 ... Warning, Scald* .................... 181138 ........ 18 1138 .........18 1138 ......... 18 1138 .........1 81138 .......... 18 1138 ..........181138 ........ 181138

25 .. 1 ... Warning, Temperature* .........182734 ........ 182734.........182734 ......... 182734 .........182734 .......... 182734 ..........182734 ........ 182734

IGNITER

26 .. 1 ... Lighter Rod & Cable ..............180117 ........ 180117 .........180117 ......... 180117 ......... 180117 .......... 180117.......... 180117 ........ 180117

27 .. 1 ... Piezo Igniter ............................70432 .......... 70432...........70432 ........... 70432...........70432 ............ 70432........... - - - - - .......... - - - - -

28 .. 1 ... Bracket, Piezo Igniter ........... 70434-3....... 70434-3 ....... 70434-3........ 70434-3 ....... 70434-3......... 70434-3 ......... - - - - - ..........- - - - -

PGCG 40&50

CTG 40&50

PGCG 40&50

29 .. 1 ... Pipe Collar............................ 20172-21 ..... 20172-21 .....20172-21...... 20172-21 ..... 20172-21....... 20172-21 ...... 20172-21 .... 20172-21

30 .. 2 ... Pipe Insulation* ......................181639 ........ 181639.........181639 ......... 181639 .........181639 .......... 181639 .......... 181639 ........ 181639

31 .. 1 ... Thermostat .......................... 180193-4..... 180193-4 ..... 182792-1...... 180193-4 .....180193-4....... 182792-1 ...... 180193-4 .... 180193-4

32 .. 1 ... Heat Trap Inlet Tube ........... 181068-37... 181068-37 ...181068-37.... 181068-40 ...181068-40..... 181068-40 ....... - - - - - .......... - - - - -

33 .. 1 ... Inlet Tube ............................... - - - - - .......... - - - - - ......... - - - - - ........... - - - - - ......... - - - - - ............ - - - - - ........ 21067-37 .... 21067-37

34 .. 1 ... Drain Valve........................... 26273-6....... 26273-6 ....... 26273-6........ 26273-6 ....... 26273-6......... 26273-6 ........ 26273-7....... 26273-7

35 .. 1 ... T & P Relief Valve.................43151-2....... 43151-2 .......43151-2........ 43151-2 ....... 43151-2......... 43151-2 ........ 43151-2....... 43151-2

36 .. 1 ... Thermostat Shield (optional) . 191259-001. 191259-001 .191259-001.. 191259-001 . 191259-001... 191259-001 .. 191259-001 191259-001

CTG 40&50

PGCG 40&50

SMR S19 & S44

1 .. 1 ... Anode - Magnesium ........... 183463-39... 183463-39 ... 183463-39.... 183463-39 ...183463-39..... 183463-39 .... 183463-39 .. 183463-39

SMR K32

5 .. 1 ... Main Burner Ass’y. .............. 181670-4 ..... 181670-4 ....... - - - - - ........ 181670-5 ..... 181670-5.......... - - - - - .......... - - - - - ..........- - - - -

10 .. 1 ... Orifice, Main Burner ........... 181508-35... 181508-35 ...... - - - - - ....... 181508-35 ...181508-35......... - - - - - .......... - - - - - .......... - - - - -

SMR R99 & S06

21 .. 1 ... * Manual - Earthquake ...........181809 ........ 181809......... 181809 ......... 181809.........181809 .......... 181809 ..........181809 ........ 181809

- .. 1... * Insert Sheet ........................182552 ........ 182552.........182552 ......... 182552.........182552 .......... 182552 .......... - - - - - .......... - - - - -

* Not Illustrated Part numbers underlined are recommended stock items.

CTG 40&50

A.O. Smith Water Heater Parts Fulfillment

125 Southeast Parkway

Franklin, TN 37068

1-800-527-1953

www.hotwater.com