Desa GMP16T, GMP26T, GMP20BT, GMP30BT Connecting to GAS Supply, Typical Inlet Pipe Diameters

INSTALLATION

Continued

CONNECTING TO GAS SUPPLY

WARNING: This appliance requires a 3/8" NPT (National Pipe Thread) inlet connection to the pressure regulator.

WARNING: A qualified ser- vice person must connect heater to gas supply. Follow all local codes.

CAUTION: Never connect heater directly to the propane/ LP supply. This heater requires an external regulator (not sup- plied). Install the external regu- lator between the heater and pro- pane/LP supply.

The installer must supply an external regulator. The external regulator will reduce incoming gas pressure. You must reduce incoming gas pressure

CAUTION: Use only new, black iron or steel pipe. Inter- nally-tinned copper tubing may be used in certain areas. Check your local codes. Use pipe of large enough diameter to allow proper gas volume to heater. If pipe is too small, undue loss of volume will occur.

Typical Inlet Pipe Diameters

GMP20PT, GMP16(T) - 3/8" or greater GMP30BT, GMP26(T) - 1/2" or greater 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 15). 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.

Pressure

Regulator Heater

Cabinet

to between 11 and 14 inches of water. If you do not reduce incoming gas pressure, heater regula- tor damage could occur. Install the external regu- lator with the vent pointing down as shown in Fig- ure 14. Pointing the vent down protects it from freezing rain or sleet.

3/8" NPT Pipe Nipple

Connection*	Tee Joint
	Reducer

Ground Joint

Union

Equipment

Propane/LP Supply Tank

External Regulator

Vent

Pointing

Down

	Bushing to
	1/8" NPT
Gauge
	1/8" NPT
	Plug Tap
Test
	Trap
		Tee Joint
		Pipe
	Sediment
		Nipple
		Cap

Shutoff

Valve *

3" Min.

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

Figure 15 - Gas Connection

Figure 14 - External Regulator With Vent

Pointing Down

*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.

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