Lennox International Inc GWB9-075IH-2 GAS Supply Piping, Check Gas Supply, Leak Check Gas Piping

GAS SUPPLY PIPING

!CAUTION

WHAT TO DO IF YOU SMELL GAS

•Do not try to light any appliance.

•Do not touch any electrical switch; do not use any phone in your building.

•Immediately call your gas supplier from a neighbor’s phone. Follow gas supplier’s instructions.

•If you cannot reach your gas supplier, call the fire department.

Check Gas Supply

Gas pipe to your boiler must be correct size for length of run and for total Btu per hour input of all gas utilization equipment connected to it. See Table 7, Page 29.

Boiler and its individual shutoff valve must be disconnected from gas supply piping system during any system pressure testing at test pressures in excess of ½ psig (3.5kpa).

Boiler must be isolated from gas supply piping system by closing its individual manual shutoff valve during any pressure testing of gas supply piping system at test pressures equal to or less than ½ psig (3.50ka).

Connecting The Gas Piping

See Figure 19, Page 29 for general layout at boiler. Gas line enters boiler from right side jacket panel.

Boiler is equipped with ½” NPT connection on gas valve for supply piping.

Following rules apply:

1.Use piping materials and joining methods acceptable to authority having jurisdiction. In absence of such requirements:

•USA - National Fuel Gas Code, ANSI Z223.1/NFPA 54

•Canada - Natural Gas and Propane Installation Code, CAN/CSA B149.1

2.Size and install gas piping system to provide sufficient gas supply to meet maximum input at not less than minimum supply pressure. See Table 7, Page 29

3.Use ground joint unions.

4.Provide sediment trap up stream of gas valve.

5.Use two pipe wrenches when making the connection to gas valve to keep it from turning.

6.Install a manual shutoff valve in the vertical pipe about 5 feet above floor.

7.Tighten all joints securely.

8.Propane gas connections should only be made by licensed propane installer.

9.Two stage regulation should be used by propane installer.

10.Propane gas piping should be checked out by propane installer.

!DANGER

Fire Hazard. Do not use matches, candles, open

flames, or other methods providing ignition source. Failure to comply will result in death or serious injury.

Leak Check Gas Piping

Pressure test boiler and gas connection before placing boiler in operation.

•Disconnect boiler and its individual gas shutoff valve from gas supply system.

•Isolate boiler from gas supply system by closing manual gas shutoff valve. See Figure 19, Page 29.

•Locate leakage using gas detector, noncorrosive detection fluid, or other leak detection method acceptable to authority having jurisdiction. Do not use matches, candles, open flames, or other methods providing ignition source.

•Correct leaks immediately and retest.

Table 6 - Gas Supply Pressure

	NATURAL	PROPANE
	GAS	GAS
MAXIMUM GAS	10” w.c.	14” w.c.
SUPPLY PRESSURE
MINIMUM GAS SUPPLY	4” w.c.	10” w.c.
PRESSURE

28