GE GP94DNSRSA, GN94DNSRSA, GN75DNSRSA warranty GAS Piping

Page 12

Installation Instructions

CONNECTING THE WATER HEATER TO GAS AND WATER

1 GAS PIPING

GENERAL INSTRUCTIONS

Make sure gas supply is off prior to making any connections to the water heater. A manual gas control valve, provided with this water heater, must be placed in the gas supply line to the water heater. A union can be used on the connection above the shut-off valve for the future servicing or disconnection of the unit.

Check the type of gas and the gas inlet pressure before connecting the water heater. If the water heater is not of the gas type that the building is supplied with, DO NOT connect the water heater. Contact the dealer for the proper unit to match the gas type.

Check the gas supply pressure immediately upstream at a location provided by the gas company. Supplied gas pressure must be within the limits shown in the Specifications section.

Before placing the appliance in operation, all joints, including the heater, must be checked for gas tightness by means of leak detector solution, soap and water or an equivalent nonflammable solution, as applicable. (Since some leak test solutions, including soap and water, may cause corrosion or stress cracking, the piping shall

be rinsed with water after testing, unless it has been determined that the leak test solution is noncorrosive.)

Always use approved connectors to connect the unit to the gas line. Always purge the gas line of any debris before connection to the water heater.

The gas supply line shall be gas tight, sized and so installed as to provide a supply of gas sufficient to meet the maximum demand of the heater and all other gas-consuming appliances at the location without loss of pressure.

Any compound used on the threaded joint of the gas piping shall be a type which resists the action of liquefied petroleum gas (propane/LPG).

Refer to an approved pipe sizing chart if in doubt about the size of the gas line.

1 GAS PIPING (cont.)

PIPE SIZING PROCEDURE

The gas supply to the home must be capable of handling the entire gas load of the home, calculated by adding the BTU rating of each gas appliance in the home. State and local codes must be met, as well as utility requirements, to ensure gas supply to the unit is adequate to meet the rated demand. Use the charts below as a guide to size the pipe from the utility meter to the tankless water heater. Gas line sizing is based on gas type, the pressure drop in the system, the gas pressure supplied and the gas line type. Refer to the National Fuel Gas Code, NFPA 54, and/or your local gas provider, for proper gas line sizing.

PIPE SIZING TABLE – NATURAL GAS

cubic feet per hour

Schedule 40 Metallic Pipe

Inlet Pressure:

less than 2 psi (55 inches W.C.)

 

Pressure Drop:

0.3 inches W.C.

 

 

 

Specific Gravity:

0.60

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIPE SIZE (INCHES)

 

Length

3/4

 

 

1

11/4

 

11/2

10

273

 

 

514

1060

 

1580

20

188

 

 

353

726

 

1090

30

151

 

 

284

583

 

873

40

129

 

 

243

499

 

747

50

114

 

 

215

442

 

662

60

104

 

 

195

400

 

600

70

95

 

 

179

368

 

552

80

89

 

 

167

343

 

514

90

83

 

 

157

322

 

482

100

79

 

 

148

304

 

455

125

70

 

 

131

269

 

403

150

63

 

 

119

244

 

366

175

58

 

 

109

224

 

336

200

54

 

 

102

209

 

313

PIPE SIZING TABLE – PROPANE GAS

cubic feet per hour

Schedule 40 Metallic Pipe

Inlet Pressure:

11.0 inches W.C.

 

 

Pressure Drop:

0.5 inches W.C.

 

 

Specific Gravity:

1.50

 

 

 

 

 

 

 

 

 

 

 

 

 

 

PIPE SIZE (INCHES)

 

Length

1/2

 

 

3/4

1

11/4

10

291

 

 

608

1150

2350

20

200

 

 

418

787

1620

30

160

 

 

336

632

1300

40

137

 

 

287

541

1110

50

122

 

 

255

480

985

60

110

 

 

231

434

892

80

101

 

 

212

400

821

100

94

 

 

197

372

763

125

89

 

 

185

349

716

150

84

 

 

175

330

677

175

74

 

 

155

292

600

200

67

 

 

140

265

543

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Contents Before Beginninginstallation Safety PrecautionsFor Your Safety Models GN75DNSRSA, GN94DNSRSA, GP94DNSRSAInstallation Instructions Safety PrecautionsParts Provided Tools YOU will NeedDimensions GN75/GN94/GP94DNSRSADescription Planning for Venting INTAKE/EXHAUST GuidelinesFlue Terminal Clearances Flue Terminal Clearances Ansi Z21.10.3 CSAAdditional Clearances Vent Terminal Flue Installation Condensate Drain Horizontal Termination withCondensate Drain Planning for Plumbing Shown with optional pipe coverClearances for Water Heater Corrosive AtmospheresMounting the Water Heater Mounting the Water Heater Mounting the WaterheaterGAS Piping GAS PipingConnecting the Water Heater to the GAS Supply Water Piping Water PipingPressure Relief Valve Internal BUILT-IN Freezer ProtectionConnecting the Water Heater to the Water Supply Supplemental Freeze ProtectionRecommended Piping for Basic Installation KEYFreeze Protection For External Piping Electrical Connection Information Electrical RequirementsVenting Instructions Venting InstructionsCondensate Maximum Vent LengthFlue Installation Concentric Venting Vent ProductsProduct Parts High Altitude Installations GuidelinesRemote Controller Installation ConfigurationsLocation Mounting the ControllerCleaning the Inlet Filter Cleaning the Inlet FilterInstallation Checklist Technical Data Pressure Drop CurveOutlet Flow Data Ladder Diagram Page