Desa VSGF33NRC - Manual (Page 13)

www.desatech.com 119304-01A 13
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 17. 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 1/2" diameter or greater
to allow proper gas volume to fire-
place. 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 18).
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 fire-
place valves. Never use sealant on flare threads.
INSTALLATION
Continued
Figure 17 - External Regulator on
Propane/LP Supply Tank with Vent
Pointing Down
External
Regulator
Propane/LP
Supply Tank
Vent Pointing Down
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer. See
Accessories, page 32.
** Minimum inlet pressure for purpose of input
adjustment.
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 18. 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 fireplace gas controls. If sediment trap is not
installed or is installed wrong, fireplace may not
run properly.
Figure 18 - Gas Connection
3" Minimum
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)
Sediment Trap
Cap Pipe Tee
Nipple Joint