Desa GWP30TA Installation, Checking Gas Connections, Pressure Testing Gas Supply Piping System

INSTALLATION

Continued

IMPORTANT: Hold the pressure regulator with wrench when connecting it to gas pip- ing and/or fittings. Do not over tighten pipe connection to regulator. The regulator body could be damaged.

	Pressure			Heater
	Regulator
				Cabinet
	3/8" NPT
	Pipe Nipple
Connection*	Bushing to		Ground Joint
			Union
	Tee Joint
			Equipment
	Reducer
			Shutoff
Gauge	1/8" NPT		Valve*
	1/8" NPT
Test	Plug Tap			Natural Gas
	Trap		3"
		Tee Joint		From Gas
			Min.	Meter
		Pipe
	Sediment			(4" W.C. to
		Nipple	10.5" W.C. Pressure)
		Cap		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 al- ternative to test gauge connection. Purchase the optional CSA design-certified equipment shutoff valve from your dealer. See Acces- sories, page 26.

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 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 equip- ment 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 located 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 fittings for leaks.

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

1.Close equipment shutoff valve (see Fig- ure 16).

2.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.

Equipment	Open
Shutoff Valve
	Closed

Figure 16 - Equipment Shutoff Valve

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