A.O. Smith HW/HWB 300 THRU 670 manual Parts Description HW 399/420 HW670

Page 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

59

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

48

 

 

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

5

 

 

 

 

 

 

 

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

67

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

64

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

72

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

ROBERTSHAW GAS VALVE

 

 

 

 

 

 

 

 

 

 

 

63

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

58

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

72

 

 

 

 

 

 

 

 

COIL HIGH LIMIT ASSEMBLY

 

 

 

38

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

71

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

43

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

WIRE TERMINALS USED WITH ITEM 62

 

 

 

 

 

 

 

 

PILOT ASSEMBLY

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

77951

 

85688

99593

78469

 

78468

 

 

 

 

 

 

 

 

 

 

 

Item

Parts Description

 

 

 

HW 300

HW 399/420

HW 520

HW670

1

Base, Assembly

 

 

76195-700

76193-700

76193-700

76193-700

2

Box, Junction

 

 

190616-4

190616-4

190616-4

190616-4

3

Bracket, Gas Control String

93764

 

93764

93764

93764

4

Bracket, Pilot (At Main Gas Burner)

190424

190424

190424

190424

5

Bracket, Shield

 

 

190473

190473

190473

190473

6

Burner, Main: Sea....................................................Level

 

 

98593-20

98593-2

98593-21

98593-4

 

..........

Natural Gas

 

 

 

7

Propane Gas

 

 

98593-1

98593-3

98593-22

98593-5

Burner, Pilot (With......................................................Orifice):

210871

210871

210871

210871

 

..........

Natural Gas

 

 

 

9

Propane Gas

 

 

210871-1

210871-1

210871-1

210871-1

Bushing, Snap

 

 

98863

 

98863

98863

98863

10

Cap, Terminal End

 

 

98206

 

98206

98206

98206

11

Clamp, Capillary Tube

 

 

94998

 

94998

94998

94998

12

Clamp, Tubing

 

 

68903

 

68903

68903

68903

13

Clip, Retainer

 

 

92979

 

92979

92979

92979

14

Coil, Combustion Chamber

97485

 

97486

99267

99267

15

 

 

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

 

 

190285-10

212037/212037....-1

212035

190286-1

Collector, Flue (Series 100)HW

212035

190286

16

Collector, Flue (Series 101)

190285-1

212037/212037-1

Control, Intermittent Ignition:

191182-2

191182-2

191182-2

191182-2

 

..........

Natural Gas (Series 100)

 

17

Propane Gas (Series 101)

191182-3

191182-3

191182-3

191182-3

Control, Limit

 

 

93661-4

93661-4

93661-4

93661-4

18

Control, Limit (Protector Switch)

77981-2

77981-2

77981-2

77981-2

19

Cover, Leg

 

 

97259-701

97259.......... -701

97259-701

97259-701

20

Cover, Limit Control (Protector Switch)

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

96667-706

96667.......... -706

96667-706

96667-706

21

Cover, Peep Hole

 

 

1050-702

1050-702

1050-702

1050-702

22

Cover, Top

 

 

96096-709

96096.......... -701

96378-702

96378-701

23

*Decals:

 

 

191857

191857

191857

191857

 

..........

ASHRAE

 

 

 

 

..........

California

 

 

42985

 

42985

42985

42985

 

..........

Clearance — Models HW-300, 399

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

190022-1

190022-2

- - - -

- - - -

 

..........

Clearance — Models HW-420, 520 & 670

- - - -

 

76982

76982

76982

 

 

 

 

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

 

 

192872

192872

192872

192872

 

..........

Flammable Vapors/ScaldHW

191367

191367

 

..........

Lighting & Operating

 

 

191367

191367

 

..........

M.E.A

 

 

42929-22

42929-22

42929-23

42929-22

 

..........

Pilot 77860

 

 

77860

 

77860

77860

97315

 

..........

Protector

 

 

97315

 

97315

97315

 

..........

Warning

 

 

190230

190230

190230

190230

 

..........

Water Inlet

 

 

94518

 

94518

94518

94518

 

..........

Water Outlet

 

 

94519

 

94519

94519

94519

 

 

Wiring Diagram:

 

 

 

 

 

 

 

 

 

 

 

Natural Gas

 

 

192359

192359

192359

192359

 

 

Propane Gas

 

 

192360

192360

192360

192360

24

Elbow, Union With 1/8" Pressure Tap

1854

 

2482

86506

86506

25

Exchanger, Heat

 

 

190922

190913

190889

190889

26

Fitting, Limit Control

 

 

97570

 

97570

97570

97570

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Image 2
Contents Replacement Parts List Parts Description HW 399/420 HW670 96053 Hood, Draft Smith Water Products CO., INC

HW/HWB 300 THRU 670 specifications

A.O. Smith HW/HWB series is designed to provide reliable hot water solutions for residential and commercial needs. The HW/HWB 300 THRU 670 models are engineered to deliver consistent performance while maintaining energy efficiency, catering to a variety of applications.

One of the main features of the HW/HWB series is its high-capacity design. The range includes models robust enough to handle demands for both small and large properties. With storage capacities that can accommodate extensive hot water needs, these water heaters ensure that users never run out of hot water during peak usage times.

The HW series employs advanced heating technologies that contribute to efficient thermal performance. They utilize a highly effective heat exchanger design, which promotes faster heating times and reduces energy waste. This results in lower utility bills and a minimized carbon footprint, aligning with contemporary energy-saving standards.

In addition to heating efficiency, these models are designed with durability in mind. The tanks are constructed from high-quality materials that are resistant to corrosion and scaling, extending the lifespan of the unit. A.O. Smith also incorporates advanced insulation technology, reducing heat loss and enhancing energy savings.

Another significant characteristic is the HW/HWB series’ ease of installation and maintenance. The design includes accessible entry points for connections, allowing for quick installation even in tight spaces. Additionally, the built-in diagnostic features facilitate maintenance, enabling users to detect potential issues before they escalate, ensuring continuous operation.

Safety is paramount, and the HW/HWB series comes equipped with several safety features. These include temperature and pressure relief valves that prevent potential hazards, promoting safe operation over the life of the unit.

Overall, the A.O. Smith HW/HWB 300 THRU 670 series combines capacity, efficiency, and durability with user-friendly features. Its advanced technologies cater to diverse hot water needs while ensuring cost effectiveness and reliability, making it a preferred choice for those seeking dependable hot water solutions. Whether for a residential setting or a commercial environment, these models stand out for their quality and performance.