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.

Install sediment trap in supply line as shown in Figure 13. 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.

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 10.

3/8" NPT

Pipe

Nipple

Ground

Joint

Union

Pressure

Regulator

Heater Cabinet

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

Equipment

Shutoff

Valve *

Natural Gas

 

 

 

From Gas

 

 

 

Meter (7" W.C.

 

 

 

to 10.5" W.C.

3"

 

 

Pressure)

 

 

 

Min.

 

Propane/LP

 

 

 

 

 

 

 

From External

 

 

 

Regulator

 

 

 

(11" W.C. to 14"

W.C. Pressure)

 

 

 

Tee Joint

Reducer Bushing to 1/8" NPT

1/8" NPT Plug Tap

Cap Pipe Tee Nipple Joint

Sediment Trap

Test Gauge Connection*

 

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 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.

Figure 13 - 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 25.

6.

Reconnect heater and equipment shutoff

 

valve to gas supply. Check reconnected fit-

 

tings for leaks.

117001-01A

www.desatech.com

11

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Desa GWP10 GWN10T Checking GAS Connections, Test Pressures In Excess Of 1/2 Psig 3.5 kPa, Natural Gas, Propane/LP

GWP10 GWN10T specifications

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