Vanguard Heating VN6A, VN12 Checking GAS Connections, Pressure Testing GAS Supply Piping System

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

3/8" NPT Pipe Nipple

Manual

Shutoff

Valve *

From

Gas Meter (4" W.C. to 10.5" W.C. Pressure)

3" Minimum

Pressure

Regulator

Heater

Cabinet

Ground Joint

Union

Tee Joint
Reducer		Test
Bushing to		Gauge
1/8" NPT	Connection *
1/8" NPT
Plug Tap

Tee
Joint	Sediment
Pipe
	Trap
Nipple
Cap

CHECKING GAS CONNECTIONS

10

Figure 10 - 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 21.

!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.

Continued