Vanguard Heating VN12A, VN6B Checking Gas Connections, Connecting To Gas Supply, Continued

CONNECTING TO GAS SUPPLY

Continued

CHECKING GAS CONNECTIONS

14

IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping and/or fittings.

	Pressure
	Regulator
3/8" NPT
Pipe Nipple	Heater
	Cabinet
	Ground Joint
	Union
Manual	Tee Joint
Shutoff
Valve *	Reducer		Test
	Bushing to		Gauge
From	1/8" NPT	Connection *
Gas Meter	1/8" NPT
(4" W.C. to	Plug Tap
10.5" W.C.	Tee
Pressure)
	Joint
		Sediment
3" Minimum	Pipe
		Trap
	Nipple

Cap

Figure 12 - Gas Connection

*An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. Purchase the optional A.G.A. design-certified manual shutoff valve from your dealer. See Accessory, page 25.

WARNING

Test all gas piping and connections for leaks after installing or servicing. Correct all leaks at once.

WARNING

Never use an open flame to check for a leak. Apply a mixture of liquid soap and water to all joints. Bubbles forming show a leak. Correct all leaks at once.

PRESSURE TESTING GAS SUPPLY PIPING SYSTEM

Test Pressures In Excess Of 1/2 PSIG

1.Disconnect heater and its individual manual shutoff valve from gas supply piping system. Pressures in excess of 1/2 PSIG will damage heater regulator.

2.Cap off open end of gas pipe where manual shutoff valve was connected.

3.Pressurize supply piping system by either using compressed air or opening main gas valve located on or near gas meter.

100845