Desa VRL24NR Owner's Operation And Installation Manual page 15

INSTALLATION
Continued
Installation Items Needed
Before installing heater, make sure you have the
items listed below.
• external regulator (supplied by installer)
• piping (check local codes)
• sealant (resistant to propane/LP gas)
• equipment shutoff valve *
• test gauge connection *
• sediment trap
• tee joint
• pipe wrench
* 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 41.
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 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 13. 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
certain areas. Check your local
codes. Use pipe of 1/2" diameter or
greater to allow proper gas volume
to heater. If pipe is too small, undue
loss of volume will occur.
Propane/LP
Supply Tank
Figure 13 - External Regulator With Vent
Pointing Down
110021-01N
Installation must include a 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 or 15, page
16, depending on your model).
IMPORTANT: Install equipment shutoff valve in an
accessible location. The main gas valve is for turn-
ing 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.
sealant that is resistant to liquid
petroleum (LP) gas.
We recommend that you install sediment trap
in supply line as shown in Figure 14 or 15, page
16, depending on your model. 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.
regulator. Hold gas regulator with
wrench when connecting it to gas
piping and/or fittings (Thermo-
stat-Controlled Models Only).
gas control. Hold gas control
with wrench when connecting
it to gas piping and/or fittings
External
(Remote-Ready Models Only).
Regulator
Vent
Pointing
Down
www.desatech.com
WARNING: Use pipe joint
CAUTION: Avoid damage to
CAUTION: Avoid damage to
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