Connecting GAS Service

1.Connect gas service from meter to control assembly in accordance with ANSI Z223.1 and local codes or utility. A ground joint union should be installed for easy removal of gas control for servicing. A drip leg or trap must be installed at the bottom of a vertical section of piping at the inlet to the boiler. A pipe compound resistant to the action of liquified petroleum gases must be used on all threaded pipe connections. Check with the local utility for location of manual shutoff valve if required. See figure 13 below.

2.The gas line should be of adequate size to prevent undue pressure drop and never smaller than the pipe size of the main gas control valve. See chart below.

3.To check for leaks in gas piping, use a soap and water solution or other approved method.

WARNING:

DO NOT USE AN OPEN FLAME.

4.Disconnect the boiler from the gas supply piping system during any pressure testing of the gas piping. After reconnecting, leak test the gas connection and boiler piping before placing the boiler back into operation.

Maximum Capacity of Pipe in

Cubic Feet of Gas Per Hour

(Gas pressure = 0.5 psig or less, pressure drop =

.5 in.w/c)

Nominal		Length of Pipe (Feet)
Iron Pipe
Size	10'	20'	30'	40'	60'	80'	100'
1/2"	175	120	97	82	66	57	50
3/4"	360	250	200	170	138	118	103
1"	680	465	375	320	260	220	195
1.1/4"	1400	950	770	660	530	460	400

For additional information refer to “Table C” of the National Fuel Gas Code Handbook.

FIGURE 13

PAGE 12

Gas-fired Boiler specifications

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