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PART 3. GAS CONNECTION
Failure to follow all precautions could result in fire, explosion or death!
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 3.5" 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 ½" and it is
mandatory that a ¾" to ½" reducing coupling (provided) is used, threaded into the branch of a ¾" 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 ¾". 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 field-installed gas cocks (following the lighting instructions in
Part 6 Section B.) This will prevent high pressure. Failure to do so may damage the gas valve. In the
event the gas valve is exposed to a pressure greater than ½ PSI, 14" water column, the gas valve must
be replaced. 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)
Nominal
Iron Pipe Internal
Size
Diameter
(inches)
(inches) 10
3/4
.824
278
1
1.049
520
1 1/4
1.380 1,050
1 1/2
1.610 1,600 1,100
12
WARNING
(Based on a 0.60 Specific Gravity Gas)
Length of Pipe (Feet)
20
30
40
50
60
190
152 130 115
105
350
285 245 215
195 180
730
590 500 440
400 370
890 760 670
610 560
70
80
90
100
125
96
90
84
79
170
160
150
130
350
320
305
275
530
490
460
410
GAS CONNECTION
150
175
200.
72
64
59
55}
120
110
100}
250
225
210}
380
350
320}
X 1,000
BTU'S
PER
HOUR
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