Desa GVB35N, GVB50N Installing Heater, Continued, For purposes of input adjustment

INSTALLING HEATER

Continued

Installation must include a manual shutoff valve, ground joint union, plugged 1/8" NPT tap, and a sediment trap. Locate NPT tap within reach for test gauge hook up. NPT tap must be upstream from heater (see Figure 7).

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 sealant that is resistant to liquid petro- leum (LP) gas.

Install sediment trap in supply line as shown in Figure 7. Locate sediment trap where it is within reach for cleaning. Locate sediment 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: Use two pipe wrenches when connecting gas piping to gas control valve of heater. This will prevent turning or damaging control valve.

Control

Valve

Ground

Joint

Union

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

Manual

Shutoff

Valve *

Tee Joint

Pipe

Nipple

Cap

Acceptable construction of inlet gas line

From Gas

Meter (5" W.C.

Min** to 7"

W.C. Max)

Preferred construction of inlet gas line

From

Gas Meter (5" W.C. Min** to 7" W.C. Max)

12

Figure 7 - 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 Accessories, page 35.

**For purposes of input adjustment.

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