Desa 10542 installation manual Natural Gas, Propane/LP

Models: 10542

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INSTALLATION

Continued

WARNING: Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.

Install sediment trap in supply line as shown in Figure 15. Locate sediment trap where it is within reach for cleaning. 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.

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

Heater

Regulator

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

to 10.5" W.C. Pressure)

 

Nipple

 

 

Natural Gas

 

 

Cap

 

 

From Gas Meter (4" W.C.

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.

113680-01A

www.desatech.com

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Desa 10542 installation manual Natural Gas, Propane/LP

10542 specifications

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