Desa VP26TA VN30A, VN18A, VP16A, VP26A, VN30TA Checking GAS Connections, Natural Gas, Propane/LP

INSTALLATION

Continued

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 volume will occur.

Typical Inlet Pipe Diameters

VN18A, VN18TA, VP16A, VP16TA and

VP16ITA - 3/8" or greater

VN30A, VN30TA, VP26A, VP26TA and

VP22ITA - 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 equipment shutoff valve is for turning on or shutting off the gas to the appliance.

Apply pipe joint sealant lightly to male NPT threads. This will prevent excess sealant from going into pipe. Excess sealant in pipe could result in clogged heater valves.

WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

Install sediment trap in supply line as shown in Figure 15. 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: Hold the pressure regulator with wrench when connecting it to gas piping and/or fittings. Do not over tighten pipe connection to regulator. The regulator body could be damaged.

Pressure
Regulator				3/8" NPT
Regulator
				Pipe
Bracket				Nipple
Heater				Ground
Cabinet				Joint
Connection*				Union
	Tee Joint			Equipment
	Reducer
				Shutoff
	Bushing to			Valve *
Gauge	1/8" NPT			Natural Gas
	1/8" NPT
			3"	From Gas
	Plug Tap			Meter (7" W.C.
Test			Min.
				to 10.5" W.C.
	Tee	Pipe Cap		Pressure)
				Propane/LP
	Joint	Nipple
	Sediment Trap			From External
				Regulator

(11" W.C. to 14" W.C. Pressure)

*A CSA design-certified equipment shutoff valve with 1/8” NPT tap is an acceptable alternative to test gauge connection. Purchase the optional CSA design-certified equipment shutoff valve from your dealer. See Accessories, page 33.

Figure 15 - Gas Connection

CHECKING GAS CONNECTIONS

WARNING: Test all gas piping and connections, internal and external to unit, for leaks after installing or servicing. Correct all leaks at once.

WARNING: Never use an open flame to check for a leak. Apply a noncorrosive leak detec- tion fluid to all joints. Bubbles forming show a leak. Correct all leaks at once.

CAUTION: For propane/LP gas, make sure external regula- tor has been installed between propane/LP supply and heater. See guidelines under Connect- ing to Gas Supply, page 11.

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