A.O. Smith DB/DW-720-1810 warranty Purging, Correct GAS

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PURGING

Gas line purging is required with new piping or systems in which air has entered.

CAUTION

PURGING SHOULD BE PERFORMED BY PERSONS EXPERIENCED IN THIS TYPE OF GAS SERVICE TO AVOID RISK OF FIRE OR EXPLOSION. PURGE DISCHARGE MUST NOT ENTER CONFINED AREAS OR SPACES WHERE IGNITION CAN OCCUR. THE AREA MUST BE WELL VENTILATED AND ALL SOURCES OF IGNITION MUST BE INACTIVATED OR REMOVED.

BEFORE PLACING THE BOILER IN OPERATION, CHECK FOR GAS LEAKAGE. Use soap and water solution or other material acceptable for the purpose in locating gas leaks. DO NOT USE MATCHES, CANDLES, FLAME OR OTHER SOURCES OF IGNITION FOR THIS PURPOSE.

1.CORRECT GAS

Make sure the gas on which the boiler will operate is the same as that specified on the boiler rating plate. Do not install the boiler if equipped for a different type gas, consult your gas supplier. These boilers are designed to operate on natural gas only.

2A. SIZING GAS SUPPLY LINE (For single boiler installations and for installations of multiples of two or three of same size boilers).

Use table 1, which is taken from ANSI booklet Z223.1, NATIONAL FUEL GAS CODE, and/or CAN/CSA-B149.1-00 to size iron pipe or equivalent gas supply line. Table 4 is based on a pressure drop of 0.3 inches of water and a specific gravity of 0.60 which is approximately for natural gas. (LP gas has an S.G. of about 1.53). If the service pressure is five inches water column or less, use one pipe size larger than specified in table 1 in order to minimize pressure drop in the line.

2B. SIZING GAS SUPPLY LINE (For multiples of over three boilers of same size or for multiple installations of two or more mixed sizes).

Capacities in cubic feet per hour of 0.60 specific gravity gas for different sizes and lengths are shown in table 4. No additional allowance is necessary for an ordinary number of fittings.

Where it is necessary to use more than the average number of pipe fittings i.e. elbows, tees, and valves in gas supply line, use a pipe larger than specified to compensate for increased pressure drop.

TABLE 4

MAXIMUM CAPACITY OF PIPE IN CUBIC FEET OF GAS PER HOUR (BASED UPON A PRESSURE DROP OF

0.3 INCH WATER COLUMN AND 0.6 SPECIFIC GRAVITY GAS)

Length in Feet (Meters)

 

 

 

Nominal Iron Pipe Size, Inches (NPT)

 

 

From Gas Meter

1/2

3/4

1

1 1/4

1 1/2

2

2 1/2

3

4

10 (3)

132

278

520

1,050

1,600

3,050

4,800

8,500

17,500

20 (6)

92

190

350

730

1,100

2,100

3,300

5,900

12,000

30 (9)

73

152

285

590

890

1,650

2,700

4,700

9,700

40 (12)

63

130

245

500

760

1,450

2,300

4,100

8,300

50 (15)

56

115

215

440

670

1,270

2,000

3,600

7,400

60 (18)

50

105

195

400

610

1,150

1,850

3,250

6,800

70 (21)

46

96

180

370

560

1,050

1,700

3,000

6,200

80 (24)

43

90

170

350

530

990

1,600

2,800

5,800

90 (27)

40

84

160

320

490

930

1,500

2,600

5,400

100 (30)

38

79

150

305

460

870

1,400

2,500

5,100

125 (38)

34

72

130

275

410

780

1,250

2,200

4,500

150 (46)

31

64

120

250

380

710

1,130

2,000

4,100

175 (53)

28

59

110

225

350

650

1,050

1,850

3,800

200 (61)

26

55

100

210

320

610

980

1,700

3,500

*The heating value of natural gas is approximately 1050 Btu/ft³. Propane (L.P.) gas has a heating value of approximately 2500 Btu/ft³.

TABLE 5

Multipliers To Be Used With Table 1 When Applying The

Gravity Factor To Other Than .60 Specific Gravity

 

Specific

 

 

Specific

 

Gravity

Multiplier

Gravity

Multiplier

.35

1.31

1.00

.78

.40

1.23

1.10

.74

 

.45

1.16

1.20

.71

.50

1.10

1.30

.68

.55

1.04

1.40

.66

 

*.60 (Nat.)

1.00

*1.50 (Prop.)

.63

.65

.96

1.60

.61

.70

.93

1.70

.59

.75

.90

1.80

.58

.80

.87

1.90

.56

.85

.84

*2.00 (Butane)

.55

.90

.82

2.10

.54

*Use these correction factors if exact specific gravity of the gas is not known.

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Contents Installation Operation Maintenance Limited Warranty TM Models DB/DW-720-1810Replacement Parts ContentsForeword Installation Clearances ROUGH-IN Dimensions CapacitiesLevelling Pressure Drop Manual Reset High Temperature Safety Limit Control FeaturesSafety Relief Valves Electronic Intermittent Pilot Ignition ControlThermal Balancer Automatic Reset High Temperature Limit ControlSafety Flow Switch Dual Stage Models only HIGH/LOW OperatorLocation Installation InstructionsRequired Ability AIR RequirementsDraft Hood Venting the BoilerVent Connection Connecting Boiler to a Common Vent GAS ConnectionsPurging Correct GASConventional Installations High Altitude InstallationsWiring Connections ExampleSystems Equipment Installation Circulating Pump Circulating Pump Must be Properly Sized for Your ApplicationConventional Space Heating Installation System InstallationTank Temperature Control LOW Water CutoffDB Installation Installation AS Boiler ReplacementPage LINEAR-TEMP Space Heating Installations LINEAR-TEMP Space Heating ApplicationsDuraMax Pump Performance Requirements Safety Flow Switch Thermometer Pressure GaugeONE Boiler LINEAR-TEMP System Page Page Page Page Page Page Hard Water Conditions ONE DURA-MAX Model DW Commercial Boiler with Vertical TankONE DURA-MAX Model DW Commercial Boiler with Horizontal Tank NPT NPT Manifolding of Model TJV-120M & TJV-200M Tanks START-UP and Operating Instructions For Your Safety Read Before Operating Internal Contaminants PrecautionsChecking and Adjusting the Input Pilot BurnerPRE-TROUBLE-SHOOTING TROUBLE-SHOOTINGNo Spark AT Pilot Burner YESSpark AT Pilot Burner but Pilot will not Light Pilot Burner Lights but Main Burner does not Light Heat Exchanger Preventive Maintenance General MaintenanceVenting Maintenance Relief ValveMechanical Removal of Deposits Deliming SolventsRemoving Light Deposits of Scale Removal of AN Existing Boiler from a Common Venting SystemDURA-MAX Limited Warranty Page Page Replacement Parts

DB/DW-720-1810 specifications

A.O. Smith has a longstanding reputation for quality and innovation in the water heater industry, and the DB/DW-720-1810 model exemplifies these values. This particular water heater is designed to provide reliable hot water, making it suitable for both residential and commercial applications. Its impressive features and cutting-edge technologies set it apart from conventional models.

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