GE GN94ENSRSA, GP94ENSRSA, GN75ENSRSA installation instructions GAS Piping

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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