A. O. Smith NW-37 Parts List
PRINTFn IN LJ_S_A. 3694
7250 SOUTH CICERO AVENUE, CHICAGO, ILLINOIS 60629/(312) A9~2521
PRODUCT SERVICE DIVISION
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6
JUNE 1978
20
ELECTRIC HOT WATER BOILER PARTS LIST
MODELS NW-37 THRU NW-670
~ -- PSD-6-601
Item
1 Block, Fuse - Cootrol Circuit:
Single Pole, 15 Amp., 300 Volt 2 Pole, 30 Amp., 600 Volt. . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Block, Fuse - Power Circuit:
~
4 Bolt,Element,3/8-16X3/4" 5 Contoctor:
3 Pole, 30 Amp., 300 Volt. . . .. . . . . . . . . . . ... . . . . . . .. . . . . . . . . . . . . . . .. . . . . . . . . . . .
3 Pole, 60 Amp., 300 Volt 3 Pole, 60 Amp., 600 Volt w Block, Terminol:
3 Pole, 150 Amp. .. . .. . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Pole, 250 Amp. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ... . .
3 Pole, 350 Amp. ... . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Pole, (2 Lugs/Pole), 700 Amp. ,
Description
Part No.
5153
5268
5155
98371
5123
5160
5138
5137
5269
5288
3 Pole, 50 Amp., (120VoltCoil) 4 Pole, 50 Amp., (120 Volt Coil) .. . . . . . . .. . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .
6 Control, Pressure . . . . .. . .. . . . . . . . . . . .. . . .. . . . . . . . . . . ... . .. . . . . . . . . . . . . . . .
7 Elements ,..,.",...".,.. --- 8 *Flonge, Blonk- Element Opening 9 Fuse, Control Circuit:
15 Amp. Buss I NOS- 15 (13/16" Dia. X 5" Lang) (4BOV-lnput Side af Transformer) . . . . . . . . . . .
15 Amp. Buss 'KTK-15 (13/32" Dia. X 11/2" Long) (48OV - Input Side of Transformer) 15 Amp. Buss 'SC-15 (208V 8. 240V - Input Side of Transformer and Output Side for all
Voltages) . . . . . . . .. . . . . . . . . . . . . . . .. . . . . . ... . .. . . . . . . . . . . . . .. .. . . . . . . . . . . . . . . . . . . .. .
10 Fuse, Power Circuit:
11
1 ?
30 Amp., 300 Volt, Buss'SC-30 30 Amp., 600 Volt, Buss'FRS-30 35 Amp., 300 Volt, Buss'SC-35 ,
60 Amp., 300 Volt, Buss SC-60 60 Amp., 600 Volt, Buss'FRS-60 Fuse, Step Control Input-I Amp. 250VoltBussIAGCI ,~ **Fuse, Step Control Output:
,
/.15Amp., 250 Volt, Buss MDL15 100 .30 Amp., 250 Volt, Buss'MDL3/10 : .50 Amp., 250 Volt, Buss'MDLI/2 .60 Amp., 250 Volt, Buss'MDL6/10 ; .75 Amp., 250 Volt, Buss'MDL3/4 13 -Gosket,Cleanout4"X6" Gasket, Cleonout 11" X 15" ;
14
15
Gasket, Element Gauge, Pressure0-200lbs. Interlock, Safety Door - 120 Volt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .;
16
17
18
19
20
~. Step-Control, Solid State - PS Series (With Thermistor ond Input Fuse - Less Output Fuse) -
?1
22
Light, Indicotar, 120 Volt. . . . . ... . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . .. . . . . . .. . . .. .. ..,
Probe, LowWoterCutoffRelay Relay, Low Water Cutoff. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Standard (DSR or LOR Not Included):
5 Step. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . .. . .. . . . . . . .. . .. . . . ..
10 Step. . . . . . . . . . . . . . . . . .. .. ... . . . .. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
15 Step (With Auxiliary lkIit) With Dual Sensor Reset (DSR):
5 Step. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . .. . . ... . .. ... . . .. . . .. .. . .. . . . .. . . . . . . . . . . .
10 Step.. . . . . . . . . . . . . . . . . . . . . . . .. . . .. . . ... . . .. . .. . . . . . . .. . . . .. . .. . . . . . . ...
15 Step With Lood Override Reset (LOR):
5 Step. . .. . . . . . . . . . . . . . .. . . . ... . . . . . . . . . . . . . . . .. . . . . . .. . . . . . . .. . . . . . . .. . .. .. .. .
10 Step. . . . . . . . . . . . . . . . . . . . . .. . . . . .. . . . . .. . . . . . .. . . ... . . .. . . . .. . .. .. . . . . .. . . ...
15 Step. . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. .. . ..
Switch, High Limit- Automatic Reset-1400- 2400F Switch, High Limit- Manual Reset- 1100- 2900F Switch, Pilot- 120V Thermistor- PS Series (With Compression Fitting) Compression Fitting Only. . . . . . . . . . .. . .. . .. .. . . . .. . . . . . . . . . .. . . .. . . .. . . . . .. . . . .. . . . . .
23
24
25
26
??
~, Transformer:
20B/120V 50VA, 100VA, 150VA 208/120V 250VA 240/480Vto120VSec. 75VA100VA 240/480Vt0120VSec. 150VA 240/480Vt0120VSec. 250VA 240/480V to 120VSec, 500VA 2B * -Wire:
Control Circuit, 14AWG-TypeTfWN/THHN, 105OC Power Circuit, BAWG-TypeAWM80/90/105OC Probe to Relay, 12 AWG - Type TfWN/THHN, 105OC ... *Not Illustrated.
~
5102-4
ill!
~FF FI FMENT TABLE
26344-1
5115
5275
5116
5114
5122
5126
99253
5125
5159
5165
5158
5166
5167
5168
~
7973
5109
5T2O
5111
5176
5106
5105
5204-5
5204-10
5204-15
5285-5
5285-10
5285-15
5286-5
5286-10
5286-15
5217
5218
5110
5141
5149
5152
5147
98366
5151
5143
5266
35841
5277
30623
**Size of fuse depends upon number of contactors in circuit, i. e., 1 amp per contactor, re: 3 contactors
require.3 amp fuse,S contactors require. 5 amp fuse.
- When ordering wire indicate length required in inches (Example: 35B41-1 00 = 100" length).
NOTE: Part numbers underlined are recommended stock items. (Consider electricol
charocteristics in your area.
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