Connecting to GAS Supply, Typical Inlet Pipe Diameters

INFRARED PROPANE/LP 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.

CAUTION: Never connect heater directly to the propane/ LP supply. This heater requires an external regulator (not sup- plied). Install the external regu- lator between the heater and propane/LP supply.

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

Typical Inlet Pipe Diameters

FB-3B/FBS-3C	3/8" or greater
FB-5B/FBS-5C	1/2" or greater

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 15).

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 15. 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.

The installer must supply an external regu- lator. The external regulator will reduce incoming gas pressure. You must reduce incoming gas pressure to between 11 and 14 inches of water. If you do not reduce incom- ing gas pressure, heater regulator damage could occur. Install external regulator with the vent pointing down as shown in Figure

14.Pointing the vent down protects it from freezing rain or sleet.

External Regulator

Propane/LP

Supply

Tank

Vent Pointing Down

Figure 14 - External Regulator with Vent Pointing Down

Pressure
Regulator
Regulator
Bracket
Heater		3/8" NPT
Heater		Pipe Nipple
Cabinet
		Ground Joint
		Union
	Tee Joint
Test	Reducer	Equipment
Gauge	Bushing to	Shutoff
Connection *	1/8" NPT	Valve *
	1/8" NPT	Inlet Pipe From
	1/8" NPT	External Regulator
	Plug Tap	External Regulator
	Plug Tap	(11" W.C. to 14"
		(11" W.C. to 14"
		W.C. Pressure)

	Tee Joint
Sediment	Pipe Nipple
Trap	Pipe Nipple	3" Minimum
	Cap

Figure 15 - Gas Connection

*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 19.

105567

FB-3B specifications

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Desa FB-3B installation manual Connecting to GAS Supply, Typical Inlet Pipe Diameters

Models: FB-3B