Desa SF20NT Installation, Checking Gas Connections, Pressure Testing Gas Supply Piping System

INSTALLATION

Continued

IMPORTANT: Hold the pressure regulator and connector 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.	3/8" Male	Pipe Joint
Flex Gas
	Flare to NPT	Sealant Required
Line
	Connector	(NPT End)
3/8" Male		Pressure
Flare		Regulator
to NPT
Connector
Pipe Joint	Equipment
Sealant	Shutoff
Required	Valve*

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 10.

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.

(NPT End)

Tee Joint

Reducer Bushing to 1/8"

NPT

1/8" NPT

Plug Tap

Test Gauge Connection*

3/8" NPT Pipe Nipple

Natural Gas From Gas Meter (4" W.C. to 10.5" W.C. Pressure)

Propane/LP

	From External
3" Min	Regulator
	(11" W.C. to 14"
	W.C. Pressure)

2.	Cap off open end of gas pipe where equipment
	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.

Cap Tee Pipe

Joint Nipple

Sediment Trap

Figure 11 - 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 21.

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.

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 Figure 12, page 12).

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.

3.Check all joints from gas meter for natural gas or propane/LP supply tank for propane/LP gas, to equipment shutoff valve (see Figure 13 or 14, page 12). Apply a noncorrosive leak detection fluid to all joints. Bubbles forming show a leak.

4.Correct all leaks at once.

PRESSURE TESTING HEATER GAS CONNECTIONS

1.Open equipment shutoff valve (see Figure 12, page 12).

2.For natural gas open main gas valve located on or near gas meter. For propane/LP gas open propane/LP supply tank valve.

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