Desa LMFP33PR(A) installation manual Natural Gas, Propane/LP

INSTALLATION

Continued

For propane/LP units, 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 of water. If you do not reduce incoming gas pres- sure, heater regulator damage could occur. Install external regulator with the vent pointing down as shown in Figure 19. Pointing the vent down protects it from freezing rain or sleet.

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 1/2" diameter or greater to allow proper gas volume to fireplace. If pipe is too small, undue loss of volume will occur.

Installation must include an 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 fireplace (see Figure 20).

IMPORTANT: Install equipment shutoff valve in an accessible location. The equipment shutoff valve is for turning on or shutting off the gas to the appliance.

Check your building codes for any special re- quirements for locating equipment shutoff valve to fireplaces.

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 fireplace valves. Never use sealant on flare threads.

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

We recommend that you install a sediment trap in supply line as shown in Figure 20. Locate sediment trap where it is within reach for cleaning. Install in piping system between fuel supply and fireplace. Locate sediment trap where trapped matter is not likely to freeze. A sediment trap traps moisture and contaminants. This keeps them from going into fire- place gas controls. If sediment trap is not installed or is installed wrong, fireplace may not run properly.

External

Regulator Propane/LP

Supply Tank

Vent Pointing Down

Figure 19 - External Regulator on Propane/LP Supply Tank with Vent Pointing Down

CSA Design-Certified Equipment Shutoff
Valve With 1/8" NPT Tap*
	Natural Gas
	From Gas Meter
	(5" W.C.** to
	10.5" W.C.
	Pressure)
	Propane/LP
	From External
	Regulator
	(11" W.C.**
	to 14" W.C.
3" Minimum	Pressure)
Cap Pipe	Tee
Nipple	Joint
Sediment Trap
Figure 20 - Gas Connection

*Purchase the optional CSA design-certified equipment shutoff valve from your dealer. See Accessories, page 34.

** Minimum inlet pressure for purpose of input adjustment.

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