Amana PGC(24-60)B, PGB58B installation instructions Connecting The Gas Piping Natural Gas

V. Gas Piping

IMPORTANT NOTE: This furnace is factory set to oper- ate on natural gas at the altitudes shown on the rating plate. If operation at higher altitudes and/or propane gas operation is required, obtain and install the proper con- version kit(s) before operating this furnace. Failure to do so may result in unsatisfactory operation and/or equip- ment damage. (High altitude kits are for U.S. installa- tions only.)

The rating plate is stamped with the model number, type of gas and gas input rating. Make sure the furnace is equipped to operate on the type of gas available.

	INLET GAS PRESSURE
Natural	Min. 5.0" W.C., Max. 10.0" W.C.
Propane	Min. 11.0" W.C., Max. 14.0" W.C.

Inlet Gas Pressure Must Not Exceed the Maximum Value Shown in Table 3.

Table 3

The minimum supply pressure should not vary from that shown in the table above because this could prevent the furnace from having dependable ignition. In addi- tion, gas input to the burners must not exceed the rated input shown on the rating plate. Overfiring of the fur- nace could result in premature heat exchanger failure.

High Altitude Derate (US. Installations Only - Canadian Installations to 4500 Feet Only)

When this furnace is installed at altitudes above 2000 feet, the furnace input must be derated 4% for each 1000 feet above sea level because the density of the air is reduced.

In some areas the gas supplier will derate the heating value of the gas at a rate of 4% for each 1000 feet above sea level. If this is not done, smaller orifices will be re- quired at altitudes above 3500 feet (non-derated natu- ral gas) or 4500 feet (non-derated propane gas).

A different pressure switch will be required at altitudes more than 4000 feet above sea level. This is required regardless of the heat content of the fuel used.

High altitude kits can be purchased depending on the altitude and usage of propane or natural gas. Refer to the high altitude instruction manual included with this furnace to determine which high altitude components to use.

Adjustment of the manifold pressure to a lower pres- sure reading than what is specified on the furnace name- plate is not a proper derate procedure. With a lower den- sity of air and a lower manifold pressure at the burner orifice, the orifice will not aspirate the proper amount of air into the burner. This can cause incomplete combus- tion of the gas, flashback, and possible yellow tipping.

Gas Piping

IMPORTANT NOTE: To avoid possible unsatisfactory operation or equipment damage due to under firing of equipment, do not undersize the natural gas/propane piping from the meter/tank to the furnace. When sizing a trunk line as shown in Table 4, include all appliances on that line that could be operated simultaneously.

The rating plate is stamped with the model number, type of gas and gas input rating. Make sure the furnace is equipped to operate on the type of gas available.

The gas line installation must comply with local codes, or in the absence of local codes, with the latest edition of the National Fuel Gas Code (ANSI Z223.1).

Connecting The Gas Piping - Natural Gas

Natural Gas Capacity of Pipe

in Cubic Feet of Gas Per Hour (CFH)

Length of		Nominal Black		Pipe Size (inches)
Pipe in Feet	1/2		3/4	1	1 1/4	1	1/2
10	132		278	520	1050		1600
20	92		190	350	730		1100
30	73		152	285	590		980
40	63		130	245	500		760
50	56		115	215	440		670
60	50		105	195	400		610
70	46		96	180	370		560
80	43		90	170	350		530
90	40		84	160	320		490
100	38		79	150	305		460

Pressure = .50 PSIG or less and Pressure Drop of 0.3" W.C. (Based

on 0.60 Specific Gravity Gas) Btuh Furnace Input

CFH= Calorific Value of Gas

Table 4

Refer to Figure 3 for the general layout at the furnace. The following rules apply:

1.Use black iron or steel pipe and fittings for the build- ing piping.

2.Use pipe joint compound on male threads only. Pipe joint compound must be resistant to the action of the fuel used.

3.Use ground joint unions.

4.Install a drip leg to trap dirt and moisture before it can enter the gas valve. The drip leg must be a mini- mum of three inches long.

5.Use two pipe wrenches when making connection to the gas valve to keep it from turning.

6.Install a manual shut-off valve in a convenient loca- tion (within six feet of unit) between the meter and the unit.

7.Tighten all joints securely.

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