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" 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 13. Pointing the vent down protects it from freezing rain or sleet.

CAUTION:Useonlynew,black ironorsteelpipe.Internally-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 vol- ume to heater. If pipe is too small,

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 14. 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.

CAUTION: Avoid damage to control. Hold fitting with wrench when connecting it to gas piping and/or fittings.

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 heater (see Figure 14).

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 heater valves.

CSA Design-

Certified

Equipment Shutoff

Valve With 1/8"

NPT Tap*

Gas Control

Natural Gas From Gas Meter

(5" W.C.** to 10.5" W.C. Pressure)

Propane/LP Gas

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

3" Minimum

Pipe Tee

Nipple Cap Joint

Sediment Trap

Propane/LP

Supply Tank

External

Regulator

Vent

Pointing

Down

Figure 13 - External Regulator With Vent Pointing Down (propane/LP gas only)

Approved Flexible Gas Hose (if allowed by local codes)

Figure 14 - Gas Connection

*Purchase the optional CSA design-certified equipment shutoff valve from your dealer. See Accessories, page 25.

**Minimum inlet pressure for purpose of input adjustment.

108382-01G

www.desatech.com

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Desa FVFM27PR installation manual Natural Gas From Gas Meter, Propane/LP Gas

FVFM27PR specifications

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