Vanguard Heating VN2550ITB, VN1800ITB Vent-Freenatural Gas Heater, Installation, Continued

®

VENT-FREE NATURAL GAS HEATER

INSTALLATION

Continued

CONNECTING TO GAS SUPPLY

WARNING: This appliance re- quires a 3/8" NPT (National Pipe Thread) inlet connection to the pressure regulator.

WARNING: A qualified service person must connect heater to gas supply. Follow all local codes.

IMPORTANT: Install an equipment shutoff valve in an accessible location. The equip- ment shutoff valve is for turning on or shutting off the gas to the appliance.Apply pipe joint sealant lightly to male threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves.

CAUTION: Use pipe joint seal- ant that is resistant to liquid pe- troleum (LP) gas.

Install sediment trap in supply line as shown in Figure 13. Locate sediment trap where it is within reach for cleaning. Locate sedi- ment trap where trapped matter is not likely to freeze. A sediment trap traps moisture and contaminants. This keeps them from going into heater controls. If sediment trap is not installed or is installed wrong, heater may not run properly.

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

WARNING : Never connect heater to private (non-utility) gas wells. This gas is commonly known as well-head gas.

IMPORTANT: Check gas line pressure be- fore connecting heater to gas line. Gas line pressure must be no greater than 14 inches of water. If gas line pressure is higher, heater regulator damage could occur.

CAUTION: Use only new, black iron or steel pipe. Inter- nally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of large enough diameter to allow proper gas volume to heater. If pipe is too small, undue loss of pres- sure will occur.

Typical Inlet Pipe Diameters

VN1800ITB 3/8" or greater

VN2550ITB 1/2" or greater

	Pressure
	Regulator
	Regulator
	Bracket
		3/8" NPT
	Heater	Pipe Nipple
	Cabinet
		Ground Joint
		Union
	Tee Joint
Test	Reducer		Equipment
	Bushing to		Shutoff
Gauge
	1/8" NPT	Typical	Valve *
Connection *		Inlet Pipe
	1/8" NPT		From Gas
	Plug Tap		Meter
			(7" W.C. to
			10.5" W.C.
	Tee Joint		Pressure)
Sediment
Trap	Pipe Nipple	3" Minimum
	Cap
Figure 13 - Gas Connection

Installation must include equipment shutoff valve, union, and plugged 1/8" NPT tap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 13).

*A CSA/AGA design-certified equipment shutoff valve with 1/8" NPT tap is an acceptable alternative to test gauge connection. Purchase the optional CSA/AGA design-certified equipment shutoff valve from your dealer. See Accessories, page 23.

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