Desa SBJ24VPA, SMA18VNA, SMA24VPA, SBJ18VNA installation manual Checking Gas Connections

INSTALLATION

Continued

For propane/LP units, the installer must supply an external regulator. The external regulator will reduce incoming gas pressure. You must reduce incoming gas pressure to between 11" and 14" of water. If you do not reduce incoming gas pressure, heater control valve damage could occur. Install external regulator with the vent pointing down as shown in Figure 13. Pointing the vent down protects it from freezing rain or sleet.

External

Regulator

Propane/LP

Supply Tank

Vent

Pointing

Down

Figure 13 - External Regulator With Vent
		Pointing Down
Approved Flexible Gas			Propane/LP - From
Hose (if allowed by
local codes)			External Regulator
			(11" W.C.** To 14"
			W.C. Pressure)
			Natural - From
To Gas	CSA Design-		Gas Meter (5"
			W.C.** to
Control	Certified		10.5" W.C.
Valve	Equipment		Pressure)
	Shutoff Valve
	With 1/8" NPT
	Tap*	3" Minimum
		Tee	Pipe Cap
		Joint	Nipple

Sediment Trap

Figure 14 - Gas Connection (Remote-

Ready Models Only)

*Purchase the optional CSA design-certified equipment shutoff valve from your dealer. See Accessories, page 27.

**Minimum inlet pressure for purpose of input

adjustment.

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 1/2" diameter or greater to allow proper gas volume to heater. If pipe is too small, undue loss of volume will occur.

Installation must include an 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 14).

IMPORTANT: Install equipment shutoff valve in an accessible location within 6 feet of the appli- ance. 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.

We recommend that you install a sediment trap in supply line as shown in Figure 14. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. 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.

CAUTION: Avoid damage to gas control. Hold gas control with wrench when connecting it to gas piping and/or fittings.

CHECKING GAS CONNECTIONS

WARNING: Test all gas piping and connections for leaks after installing or servicing. Correct all leaks at once.

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