GAS SUPPLY

Check all local codes for requirements, especially for the size and type of gas supply line required.

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

12.7mm

9.5mm

12.7mm

9.5mm

10-40 feet

1/2”

1/2”

5/8”

1/2”

4-12 meters

12.7mm

12.7mm

15.9mm

12.7mm

40-100 feet

1/2”

1/2”

3/4”

1/2”

13-30 meters

12.7mm

12.7mm

19mm

12.7mm

100-150 feet

3/4”

1/2”

7/8”

3/4”

31-46 meters

19mm

12.7mm

22.2mm

19mm

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.

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 ad- equate, 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.

Figure 11

The use of the following gas connectors is recommended:

ANS Z21.24Appliance Connectors 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.

Pressure Testing of the Gas Supply System

1.To check the inlet pressure to the gas valve, a 1/8" (3.175mm) N.P.T.pluggedtapping,accessiblefortestgaugeconnection,must be placed immediately upstream of the gas supply connection to the appliance.

2.The appliance and its individual shutoff valve must be disconnected from the gas supply piping system during any pressure testing of that system at test pressures in excess of 1/2 psig (3.5 kPa).

3.The appliance must be isolated from the gas supply piping system by closing its individual manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 psig (3.5 kPa).

Caution: If the gas pressure exceeds the maximum limits listed on page 6 of this manual or on the installed gas valve, it will result in a hazardous condition.

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Empire Comfort Systems VFDM24LBN-1, VFDT24LBN-1 GAS Supply, Recommended Gas Pipe Diameter, Installing a New Main Gas Cock