Desa VTDMV24PA Checking GAS Connections, Test Pressures In Excess Of 1/2 Psig, Propane/LP

INSTALLATION

Continued

CAUTION:Useonlynew,black ironorsteelpipe.Internally-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 vol- ume 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 log set (see Figure 7).

IMPORTANT: Install 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.

We recommend that you install a sediment trap in supply line as shown in Figure 7. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and appliance.

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.

WARNING: Never use an open flame to check for a leak. Apply a noncorrosive leak detection fluid toalljoints.Bubblesformingshow a leak. Correct all leaks at once.

CAUTION: Make sure exter- nal regulator has been installed between propane/LP supply and appliance. See guidelines under Connecting to Gas Sup- ply, page 7.

CSA Design-Certified Equipment Shutoff Valve with 1/8" NPT Tap*

PRESSURE TESTING GAS SUPPLY PIPING SYSTEM

Test Pressures In Excess Of 1/2 PSIG

Approved Flexible
Gas Hose (If
allowed by local
codes)	3" Min.

Natural From Gas Meter (5" W.C.** to 10.5" W.C. Pressure)

(3.5 kPa)

1.	Disconnect appliance with its appliance main
	gas valve (control valve) and equipment shutoff
	valve from gas supply piping system. Pressures
	in excess of 1/2 psig will damage control valve.
2.	Cap off open end of gas pipe where equipment

		Propane/LP
Pipe Cap	Tee	From External
		Regulator (11"
Nipple	Joint
		W.C.** to 14"
Sedament Trap
		W.C. Pressure)

Figure 7 - Gas Connection

*Purchase the optional CSAdesign-certified shutoff valve from your dealer. See Accessories, page 17.

** Minimum inlet pressure for purpose of input adjustment.

	shutoff valve was connected.
3.	Pressurize supply piping system by either
	opening propane/LP supply tank valve for
	propane/LP gas or opening main gas valve
	located on or near gas meter for natural gas
	or using compressed air.
4.	Check all joints of gas supply piping system.
	Apply noncorrosive leak detection fluid to all
	joints. Bubbles forming show a leak.
5.	Correct all leaks at once.

8 www.desatech.com 114926-01B