Desa GWN20T Continued, Checking Gas Connections, Natural Gas, Propane/LP, Equipment Shutoff Valve

INSTALLATION

Continued

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

			Heater
			Cabinet
	3/8" NPT
Connection*	Pipe Nipple
	Bushing to		Shutoff
			Ground Joint
	Tee Joint		Union
	Reducer		Equipment
Gauge	1/8" NPT		Valve *
	1/8" NPT
Test	Plug Tap		3" Min.
	Trap	Tee Joint
	Sediment	Pipe	(4" W.C. to 10.5" W.C.
		Nipple
			Natural Gas
		Cap
			From Gas Meter

Pressure)

Propane/LP

From External Regulator

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

Figure 15 - Gas Connection

*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 30.

CHECKING GAS CONNECTIONS

WARNING: Test all gas pip- ing and connections, internal and external to unit, for leaks after installing or servicing. Cor- rect all leaks at once.

WARNING: Never use an open flame to check for a leak. Apply a noncorrosive leak de- tection 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 12.

Pressure Testing Gas Supply Piping System

Test Pressures In Excess Of 1/2 PSIG (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 heater regulator.

2.Cap off open end of gas pipe where equip- ment 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 lo- cated on or near gas meter for natural gas, or using compressed air.

4.Check all joints of gas supply piping system. Apply a noncorrosive leak detection fluid to all joints. Bubbles forming show a leak.

5.Correct all leaks at once.

6.Reconnect heater and equipment shutoff valve to gas supply. Check reconnected fit- tings for leaks.

Test Pressures Equal To or Less Than 1/2 PSIG (3.5 kPa)

1. Close equipment shutoff valve (see Figure 16).

Equipment	Open
Shutoff Valve
	Closed

Figure 16 - Equipment Shutoff Valve

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