Checking Gas Connections - Vanguard VGN30 Owner's Operation And Installation Manual

CHECKING
GAS
CONNECTIONS
IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping
and/or fittings.
Pressure
Regulator
1/2" NPT
Pipe Nipple
Tee Joint
Test Reducer
Bushing to
Gauge
1/8" NPT
Connection *
1/8" NPT
Plug Tap
Tee Joint
Sediment
Pipe
Trap
Nipple
Cap
* 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 ACCESSORIES, page 23.
Test all gas piping and connections for leaks after installing or
servicing. Correct all leaks at once.
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.
Ground Joint
Union
(4" W.C. to 10.5" W.C. Pressure)
3" Minimum
Figure 10 - Gas Connection
!
WARNING
WARNING ICON G 001
!
WARNING
WARNING ICON G 001
Note: Burner bracket
not shown for clarity
Heater
Cabinet
Manual
Shutoff
Valve *
From Gas Meter
11
Continued