www.desatech.com
119345-01A
1
Natural Gas
From Gas
Meter (4" W.C.
to 10.5" W.C.
Pressure)
Propane/LP
From External Regulator
(11" W.C. to 14" W.C.
Pressure)
* 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. See
Acces-
sories
, page 23.
CHECKING GAS CONNECTIONS
WARNING: Test all gas piping
and connections, internal and
external to unit, for leaks after
installing or servicing. Correct
all leaks at once.
WARNING: Never use an
open flame to check for a leak.
Apply a noncorrosive leak detec-
tion fluid to all joints. Bubbles
forming show a leak. Correct all
leaks at once.
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test Gauge Connection*
3/8" NPT
Pipe Nipple
Heater
Cabinet
Equipment
Shutoff
Valve*
3"
Min.
Ground Joint
Union
IMPORTANT:
Hold the pressure regulator
with wrench when connecting it to gas pip
-
ing and/or fittings. Do not over tighten pipe
connection to regulator. The regulator body
could be damaged.
Tee Joint
Pipe
Nipple
Cap
Sediment
T
rap
Figure 14 - Gas Connection
INSTALLATION
Continued
Figure 13 - External Regulator With Vent
Pointing Down
External
Regulator
Propane/LP
Supply Tank
Vent
Pointing
Down
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
large enough diameter to allow
proper gas volume to heater. If
pipe is too small, undue loss of
volume will occur.
Typical Inlet Pipe Diameter
30,000 Btu/Hr Models - 1/2" or greater
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 14).
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.
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 14. 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
contaminants. This keeps them from going
into heater controls. If sediment trap is not
installed or is installed wrong, heater may
not run properly.
Pressure
Regulator
