Munchkin MUNCHKIN HIGH EFFICIENCY HEATER with the "925" Controller manual Part 3. GAS Connection

GAS CONNECTION

PART 3. GAS CONNECTION

WARNING

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)					(Based on a 0.60 Specific Gravity Gas)
	Nominal
	Iron Pipe	Internal						Length of Pipe (Feet)
	Size	Diameter
	(inches)	(inches) 10		20	30	40	50	60	70	80	90	100	125	150	175	200.
	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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