Johnson Controls 341426-BIM-A-0108 Gas Piping, Gas Connection, External Supply Connection

GAS PIPING

Proper sizing of gas piping depends on the cubic feet per hour of gas flow required, specific gravity of the gas and the length of run. National Fuel Gas Code Z223.1 or CAN/CGA B149.1 or .2 should be followed in all cases unless super- seded by local codes or gas company requirements. Refer to Tables 5 and 6.

The heating value of the gas may differ with locality. The value should be checked with the local gas utility.

NOTE: There may be a local gas utility requirement specify- ing a minimum diameter for gas piping. All units require a 1/2 inch pipe connection at the gas valve.

GAS CONNECTION

The gas supply line can be routed through the hole located on the left side of the unit. Refer to Figure 7 to locate these access openings. Typical supply piping arrangements are shown in Figure 5.

Gas piping recommendations:

1.A drip leg and a ground joint union must be installed in the gas piping.

2.When required by local codes, a manual shut-off valve may have to be installed outside of the unit.

3.Use wrought iron or steel pipe for all gas lines. Pipe dope should be applied sparingly to male threads only.

.

AUTOMATIC

GASVALVE

1/2x1/2UNION

1/2x1/2GASCOCK

1/2-14NPT

DRIPLEG

FIGURE 5 - EXTERNAL SUPPLY CONNECTION

EXTERNAL SHUT-OFF

341426-BIM-A-0108

TABLE 5: NATURAL GAS PIPE SIZING CHART1

LENGTH	NOMINAL INCHES IRON PIPE SIZE
IN FEET
	1/2”	3/4”	1”	1-1/4”
10	132	278	520	1,050
20	92	190	350	730
30	73	152	285	590
40	63	130	245	500
50	56	115	215	440
60	50	105	195	400
70	46	96	180	370
80	43	90	170	350
90	40	84	160	320
100	38	79	150	305

1.Maximum capacity of pipe in cubic feet of gas per hour (based upon a pressure drop of 0.3 inch water column and 0.6 specific gravity gas).

TABLE 6: PROPANE (LP) GAS PIPE SIZING CHART1

LENGTH	NOMINAL INCHES IRON PIPE SIZE
IN FEET
	1/2”	3/4”	1”	1-1/4”
10	275	567	1,071	2,205
20	189	393	732	1,496
30	152	315	590	1,212
40	129	267	504	1,039
50	114	237	448	913
60	103	217	409	834
70	96	196	378	771
80	89	185	346	724
90	83	173	322	677
100	78	162	307	630

1.Maximum capacity of pipe in thousands of BTU per hour (based upon a pressure drop of 0.5 inch water column).

8 Johnson Controls Unitary Products