GAS CONNECTION
A. GAS CONNECTION
The gas supply shall have a maximum inlet pressure of less than 14" water column (350 mm), ½ pound pressure (3.5 kPa), and a minimum of 7" water column. The entire piping system, gas meter and regulator must be sized properly to prevent pressure drop greater than 0.5" as stated in the National Fuel Gas Code. This information is listed on the
rating plate. It is very important that you are connected to the type of gas as noted on the rating plate. "LP" for liquefied petroleum,
propane gas or, "Nat" natural or city gas. All
gas connections must be approved by the local gas supplier, or utility in addition to the governing authority, prior to turning the gas supply on. The nipple provided is 1¼" and it is mandatory that a 1 x 1¼" reducing coupling (provided) is used, threaded into the branch of a 1¼" tee, and a drip leg fabricated, as per the National Fuel Gas code. You must ensure that the entire gas line to the connection at the Munchkin is no smaller than 1¼". Once all the inspections have been performed, the piping must be leak tested. If the leak test requirement is a higher test pressure than the maximum inlet pressure, you must isolate the Munchkin from the gas line. In order to do this, you must shut the gas off using factory and
Never use an open flame (match, lighter, etc.) to check gas connections.
B.GAS PIPING
1.Run the gas supply line in accordance with all applicable codes.
2.Locate and install manual shutoff valves in accordance with state and local requirements.
C.GAS TABLE
Refer to Table (1) to size the supply piping to minimize pressure drop between meter or regulator and unit.
Maximum Capacity of Pipe in Cubic Feet of Gas per Hour for Gas Pressures of 0.5 psi or Less and a Pressure Drop of 0.3 Inch water Column
(TABLE 1) |
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| (Based on a 0.60 Specific Gravity Gas) |
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| Nominal |
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| Iron Pipe | Internal |
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| Length of Pipe (Feet) |
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| Size | Diameter |
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| (inches) | (inches) 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 | 90 | 100 | 125 | 150 | 175 | 200. |
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| 3/4 | .824 | 278 | 190 | 152 | 130 | 115 | 105 | 96 | 90 | 84 | 79 | 72 | 64 | 59 | 55} | BTU'S | ||
1 | 1.049 | 520 | 350 | 285 | 245 | 215 | 195 | 180 | 170 | 160 | 150 | 130 | 120 | 110 | 100} | PER | |||
1 1/4 | 1.380 | 1,050 | 730 | 590 | 500 | 440 | 400 | 370 | 350 | 320 | 305 | 275 | 250 | 225 | 210} | HOUR | |||
1 1/2 | 1.610 | 1,600 | 1,100 | 890 | 760 | 670 | 610 | 560 | 530 | 490 | 460 | 410 | 380 | 350 | 320} | X 1,000 | |||
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It is recommended that a soapy solution be used to detect leaks. Bubbles will appear on the pipe to indicate a leak is present. The gas piping must be sized for the proper flow and length of pipe, to avoid pressure drop. Both the gas meter and the gas regulator must be properly sized for the total gas load. If you experience a pressure drop greater than 1" WC, the meter, regulator or gas line is undersized or in need of service. You can attach a manometer to the incoming gas drip leg, by
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