Desa H18N Owner's Operation And Installation Manual page 15

duce incoming gas pressure, heater regulator
damage could occur. Install external regulator
with the vent pointing down as shown in Figure
15. 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 heater. If
pipe is too small, undue loss of
volume will occur.
Installation must include an equipment shut-
off 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 16 or 17, depending on
your model).
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
requirements 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.
WARNING: Use pipe joint
sealant that is resistant to liquid
petroleum (LP) gas.
Propane/LP
Supply Tank
Figure 15 - External Regulator With Vent
Pointing Down
110399-01J
INSTALLATION
Continued
We recommend that you install a sediment
trap in supply line as shown in Figure 16 or 17,
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 sedi-
ment trap is not installed or is installed wrong,
heater may not run properly.
Propane/LP From
External Regulator
(11" W.C.** to 14"
W.C. Pressure)
Natural From Gas
Meter (5" W.C.** to
10.5" W.C.
Pressure)
Tee Cap Pipe
Joint
Sediment Trap
Figure 16 - Gas Connection (Variable
Approved Flexible
Gas Hose (if
allowed by local
codes)
External
Regulator
with Vent
Pointing
Down
Gas Control
Figure 17 - Gas Connection (Remote-
* Purchase the optional CSA design-certified
equipment shutoff valve from your dealer.
** Minimum inlet pressure for purpose of input
adjustment.
www.desatech.com
CSA Design-Certified
Equipment Shutoff Valve
With 1/8" NPT Tap*
3" Minimum
Nipple
Manually-Controlled Models Only)
CSA Design-
Certified Equipment
Shutoff Valve With
1/8" NPT Tap*
3" Minimum
Ready Models Only)
Approved Flexible
Gas Hose (if allowed
by local codes)
Gas Regulator
Propane/LP From
External Regulator
(11" W.C.** to 14"
W.C. Pressure)
Natural From Gas
Meter (5" W.C.** to
10.5" W.C.
Pressure)
Pipe Cap Tee
Nipple Joint
Sediment Trap
15