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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.
WARNING: Never connect
heater to private (non-utility) gas
well. This gas is commonly
known as well-head gas.
IMPORTANT: Check your gas line
pressure before connecting heater
to gas line. Gas line pressure must
be no greater than 14 inches of
water. If gas line pressure is higher,
heater regulator damage could
occur.
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
MN300HGA/MN300TGA 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 up
stream from heater (see Figure
13).
*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.
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.
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
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
natural gas.
Figure 13 -Gas Connection