Desa Variable Manually-Controlled Models Owner's Operation And Installation Manual page 16

INSTALLING
Continued
16
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 pressure, heater regulator damage
could occur. Install external regulator with the vent pointing down as shown in Figure
16. Pointing the vent down protects it from freezing rain or sleet.
Propane
Supply Tank
Figure 16 - External Regulator With Vent Pointing Down
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
fireplace. If pipe is too small, undue loss of pressure will occur.
Installation must include a manual 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 17, page 17).
Check your building codes for any special requirements for locating manual
shutoff valve to fireplaces.
Apply pipe joint sealant lightly to male threads. This will prevent excess sealant
from going into pipe. Excess sealant in pipe could result in clogged fireplace
valves.
Use pipe joint sealant that is resistant to liquid petroleum (LP) gas.
Install sediment trap in supply line as shown in Figure 17, page 17. Locate sedi-
ment trap where it is within reach for cleaning. 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.
CAUTION
WARNING ICON G 001
CAUTION
WARNING ICON G 001
External
Regulator
Vent Pointing
Down
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