Desa FGH-30NGB - Manual (Page 10)

10 105568
BLUE FLAME NATURAL GAS HEATER
CONNECTING TO GAS
SUPPLY
WARNING: A qualified service
person must connect heater to
gas supply. Follow all local codes.
WARNING: Never connect
heater to private (non-utility) gas
well. This gas is commonly known
as wellhead gas.
Typical Inlet Pipe Diameters
FA-20BB, 3/8" or greater
FAS-20BB
FA-30BB, 1/2" or greater
FAS-30BB,
FGH-30NG
Installation must include a 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.
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 con-
trols. 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 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 pres-
sure will occur.
CAUTION: Use pipe joint seal-
ant that is resistant to natural gas.
IMPORTANT: Check gas line pressure be-
fore 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.
Figure 13 - Gas Connection
* An 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 19.
INSTALLATION
Continued
WARNING: This appliance re-
quires a 3/8" NPT (National Pipe
Thread) inlet connection to the
pressure regulator.
Tee
Joint
Pipe
Nipple
Cap
Pressure
Regulator
Test
Gauge
Connection *
3/8" NPT
Pipe Nipple
Sediment
Trap
3" Minimum
Typical Inlet Pipe from
Gas Meter (4" W.C. to
10.5" W.C. Pressure)
Heater
Cabinet
Ground Joint Union Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Equipment
Shutoff
Valve *