Installation – Desa LMFP33NR(A) User Manual

Page 14

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14

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.

INSTALLATION

Continued

Figure 19 - External Regulator on

Propane/LP Supply Tank with Vent

Pointing Down

External
Regulator

Vent Pointing Down

Propane/LP
Supply Tank

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.

Sediment Trap

3" Minimum

Cap Pipe Tee

Nipple Joint

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.
Pressure)

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