Desa WMN10 - Manual (Page 11)

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Installation must include 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 13).
IMPORTANT: Install an equipment shutoff
valve in an accessible location. The equip-
ment 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 heaters.
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.
Install sediment trap in supply line as shown
in Figure 13. Locate sediment 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 contami-
nants. This keeps them from going into heater
controls. If sediment trap is not installed or is
installed wrong, heater may not run properly.
IMPORTANT: Hold pressure regulator with
wrench when connecting it to gas piping
and/or fittings. Do not over tighten pipe con-
nection to regulator. The regulator body could
be damaged.
INSTALLATION
Continued
Propane/LP
Supply Tank
Figure 12 - External Regulator With Vent
Pointing Down (propane/LP only)
Figure 13 - Gas Connection
* A CSA design-certified equipment shutoff
valve with 1/8" NPT tap is an acceptable al-
ternative to test gauge connection. Purchase
the optional CSA design-certified equipment
shutoff valve from your dealer.
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Tee
Joint
Pipe
Nipple
Cap
3/8"
NPT
Pipe
Nipple
Ground
Joint
Union
3"
Min
Natural Gas
From Gas Meter
(4" W.C. to 10.5" W.C.
Pressure [See
Specifications, page 26])
Propane/LP
From External Regulator
(11" W.C. to 14" W.C.
Pressure)
Equipment
Shutoff
Valve*
Test Gauge Connection*
Pressure
Regulator
Heater
Cabinet
Sediment
Trap
External
Regulator
with Vent
Pointing
Down