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9
INSTALLATION
CONNECTING TO GAS SUPPLY
WARNING: A qualified
service person must connect
heater to gas supply. Follow all
local codes.
WARNING: This appliance
requires a 3/8
" NPT (National Pipe
Thread) inlet connection
to the pressure regulator.
CAUTION: Never connect
heater directly to the propane/LP
supply. This heater requires an
external regulator (not supplied).
Install the external regulator between
the heater and propane/LP supply.
*A CSA/AGA design-certified equipment shutoff valve with 1/8
" NPT tap is
an acceptable alternative to test gauge connection. Purchase the optional
CSA/AGA design-certified equipment shutoff valve from
your dealer. See Accessories, page 17.
IMPORTANT: Install an equipment
shutoff valve in an accessible
location. The equipment shutoff
valve is for turning on or shutting
off the gas to the appliance.
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.
IMPORTANT: Hold pressure
regulator with wrench when
connecting it to gas piping and/or
fittings.
CAUTION: Use pipe joint
sealant that is resistant to
liquid petroleum (LP) gas.
Figure 14 -Gas Connection
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 13.
Pointing the vent down protects it
from freezing rain or sleet.
Figure 13 - External Regulator with
Vent Pointing Down
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 large enough diameter to
allow proper gas volume to heater.
If pipe is too small,
undue loss of pressure will occur.
Typical Inlet Pipe Diameters
ML300HGA / ML300TGA 1/2" or
greater
Installation must include an
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).
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 heater valves.