HearthRite HR18MN-1 Owner's Operation And Installation Manual page 9

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 10.5 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
All models up to 20,000 BTU's use
3/8'' or greater pipe;
All models 25,000 BTU's and higher,
use 1/2" or greater pipe.
Installation must
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 Figure13).
INSTALLATION
*A CSA/AGA design-certified equipment shutoff valve with 1/8
an acceptable alternative to test gauge connection. Purchase the CSA/AGA
design-certified equipment shutoff valve from your dealer.
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
include an
result in clogged heater valves.
sealant that is resistant to
natural gas.
Figure 13 -Gas Connection
CAUTION: Use pipe joint
9
Inlet Pipe From Natural
Gas Meter (7" W.C. to
10.5" W.C. Pressure)
Install sediment trap in supply line
as shown in Figure 13. Locate
sediment trap where it is within
r e a c h f o r c l e a n i n g .
sediment trap where
matter is not likely to freeze. A
sediment trap traps moisture and
contaminants. This
from going into heater controls. If
sediment trap is not installed or is
installed wrong, heater
not run properly.
IMPORTANT : Hold
regulator with wrench
connecting it to gas piping and/or
fittings.
"
NPT tap is
L o c a t e
trapped
keeps them
may
pressure
when