Locating Gas Supply, Recommended Gas Pipe Diameter

GAS SUPPLY

Locating Gas Supply

The gas line can enter the unit either through the ﬂoor or outside wall. The gas line opening should be made at this time. Location of the opening will be determined by the position of ﬂoor joists and the valve and union used for servicing.

Recommended Gas Pipe Diameter

Pipe Length	Schedule 40 Pipe		Tubing, Type L
	Inside Diameter		Outside Diameter
	Nat.	L.P.	Nat.	L.P.
0-10 feet	1/2”	3/8”	1/2”	3/8”
0-3 meters	12.7 mm	9.5 mm	12.7 mm	9.5 mm
10-40 feet	1/2”	1/2”	5/8”	1/2”
4-12 meters	12.7 mm	12.7 mm	15.9 mm	12.7 mm
40-100 feet	1/2”	1/2”	3/4”	1/2”
13-30 meters	12.7 mm	12.7 mm	19 mm	12.7 mm
100-150 feet	3/4”	1/2”	7/8”	3/4”
31-46 meters	19 mm	12.7 mm	22.2 mm	19 mm

Note: Never use plastic pipe. Check to conﬁrm whether your local codes allow copper tubing or galvanized.

Note: Since some municipalities have additional local codes, it is always best to consult your local authority and installation code.

The use of the following gas connectors is recommended:

—ANS Z21.24ApplianceConnectors of Corrugated MetalTubing and Fittings

—ANS Z21.45 Assembled Flexible Appliance Connectors of Other Than All-Metal Construction

The above connectors may be used if acceptable by the authority having jurisdiction. The state of Massachusetts requires that a ﬂexible appliance connector cannot exceed three feet in length.

Figure 1

Consult the current National Fuel Gas Code, ANSI Z223.1 CAN/ CGA-B149 (.1 or .2) installation code.

Installing a New Main Gas Cock

Each appliance should have its own manual gas cock.

A manual main gas cock should be located in the vicinity of the unit. Where none exists, or where its size or location is not adequate, contact your local authorized installer for installation or relocation.

Compounds used on threaded joints of gas piping shall be resistant to the action of liqueﬁed petroleum gases. The gas lines must be checked for leaks by the installer. This should be done with a soap solution watching for bubbles on all exposed connections, and if unexposed, a pressure test should be made.

Never use an exposed ﬂame to check for leaks. Appliance must be disconnected from piping at inlet of control valve and pipe capped or plugged for pressure test. Never pressure test with appliance connected; control valve will sustain damage!

A gas valve and ground joint union should be installed in the gas line upstream of the gas control to aid in servicing. It is required by the National Fuel Gas Code that a drip line be installed near the gas inlet. This should consist of a vertical length of pipe tee connected into the gas line that is capped on the bottom in which condensation and foreign particles may collect.

FLEXIBLE GAS LINE CONNECTION