INSTALLATION

Connecting To Gas Supply (Cont.) Checking Gas Connections

9

INSTALLATION

Continued

Installation must include 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 heater (see Figure 13).

IMPORTANT: Install an 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 sediment trap in supply line as shown in Figure 13. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and heater. 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 pressure regulator with wrench when con- necting it to gas piping and/or fittings. Do not over tighten pipe connection to regulator. The regulator body could be damaged.

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 to all joints. Bubbles forming show a leak. Correct all leaks at once.

CAUTION: For propane/LP gas, make sure exter- nal regulator has been installed between propane/LP supply and heater. See guidelines under Connecting to Gas Supply, pages 8 and 9.

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 sys-

 

tem. Pressures in excess of 1/2 psig will damage heater regulator.

2.

Cap off open end of gas pipe where equipment shutoff valve

 

was connected.

3/8" NPT Pipe Nipple

Ground

Joint Union

Equipment

Shutoff Valve*

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

Propane/LP

From External

Regulator 3" Minimum (11" W.C. to 14"

W.C. Pressure)

Figure 13 - Gas Connection

Pressure Regulator

Heater

Cabinet

Tee Joint

 

 

 

Reducer

 

Test

Bushing to

 

 

Gauge

1/8" NPT

 

 

Connection*

1/8" NPT

 

 

 

Plug Tap

 

 

Tee

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Joint

 

 

Sediment

Pipe

 

 

 

 

 

 

Trap

Nipple

 

 

 

 

 

 

 

Cap

 

 

 

 

 

 

 

 

 

 

 

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 com-

 

pressed 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.

*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 Accessory, page 29.

For more information, visit www.desatech.com

107902-01D

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Desa GWN6, GWRN10, GWRP10, GWP10T, GWP6, GWN10T Checking GAS Connections, Pressure Testing Gas Supply Piping System
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