Desa GCP6 GCN10T, GCP20T, GCN6 Connecting To Gas Supply, Installation, Continued, Gas Connection

12

INSTALLATION

Connecting To Gas Supply

INSTALLATION

Continued

CONNECTING TO GAS SUPPLY

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

WARNING: A qualified service person must con- nect heater to gas supply. Follow all local codes.

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 22).

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: For natural gas, never connect heater to private (non-utility) gas wells. This gas is commonly known as wellhead gas.

IMPORTANT: For natural gas, check gas line pressure before connecting heater to gas line. Gas line pressure must be no greater than

10.5inches (26.6 cm) of water. If gas line pressure is higher, heater regulator damage could occur.

CAUTION: For propane/LP gas, never connect heater directly to the propane/LP supply. This heater requires an external regulator (not supplied). Install the external regulator between the heater and pro- pane/LP supply.

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 22. 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.

For propane/LP gas, the installer must supply an external regulator. The external regulator will reduce incoming gas pressure. You must reduce incoming gas pressure to between 11 and 14 inches (28 and 35.5 cm) of water. If you do not reduce incoming gas pressure, heater regulator damage could occur. Install external regulator with the vent pointing down as shown in Figure 21. Pointing the vent down protects it from freezing rain or sleet.

CAUTION: Use only new, black iron or steel pipe. Internally-tinned copper tubing may be used in cer- tain 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 diameter for 20,000 btu/hr (5.9 kW) models - 3/8" or greater.

Propane/LP
Supply Tank	External Regulator
	Vent Pointing Down

3/8" NPT Pipe Nipple

Ground

Joint Union

Equipment

Shutoff Valve*

Natural Gas From Gas Meter

[6/10,000 Btu/Hr (1.8/2.9 kW) 4" (10 cm) W.C. to

10.5" (26.7 cm) W.C.
Pressure]
20,000 Btu/Hr (5.9 kW)
5" (12.7 cm) W.C. to 10.5"	3"
(26.7 cm) W.C. Pressure]
Propane/LP	7.7 cm)
	Minimum
From External Regulator

(11" (27.9 cm) W.C. to

14" (35.6 cm) W.C. Pressure)

Figure 22 - 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

Figure 21 - External Regulator With Vent Pointing Down (Propane/LP Systems Only)

For more

*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 29.

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112157-01A