Desa SFG20PT, SPC20PT, SPC20NT, LSF30NT, LSF20NT, LSF20PT, SF30PT Installation, CAUTION For propane/LP

INSTALLATION

Continued

CAUTION: For propane/LP

gas, never connect heater di-

rectly to the propane/LP supply.

This heater requires an external

regulator (not supplied). Install

theexternalregulatorbetweenthe

heater and propane/LP supply.

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" of

water. If you do not reduce incoming gas pressure,

heater regulator damage could occur. Install the

external regulator with the vent pointing down

as shown in Figure 10. Pointing the vent down

protects it from freezing rain or sleet.

CAUTION: Use only new,

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. Sealant in pipe could result in clogged heater valves. Most flex gas tubing does not require sealant. Read instructions supplied with flex gas tubing.

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

Rear View	Hole
	Provided
	in Rear
	Surround

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

Flex Gas

Line

3/8" Male Flare to NPT Connector

3/8" Male Flare to NPT Connector

Pipe Joint

Sealant

Required

(NPT End)

Pressure Regulator

volume will occur.

Typical Inlet Pipe Diameters

20,000 Btu/Hr Models - 3/8" or greater

Pipe Joint	Equipment
Sealant	Shutoff
Required	Valve*

30,000 Btu/Hr Models - 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 11).
Propane/LP	External
Supply Tank
	Regulator

(NPT End)

Tee Joint

Reducer Bushing to 1/8"

NPT

1/8" NPT

Plug Tap

Test Gauge Connection*

3/8" NPT Pipe Nipple

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

	Propane/LP
	From External
	Regulator
3" Min
	(11" W.C. to 14"
	W.C. Pressure)

Vent

Pointing

Down

Figure 10 - External Regulator With Vent

Pointing Down

Cap Tee	Pipe
Joint	Nipple
Sediment Trap

Figure 11 - 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 21.

10 www.desatech.com 116307-01B