Desa CGN10A - Manual (Page 8)

8 101870
NATURAL GAS HEATER
CGN10A AND CGN6
IMPORTANT: Hold pressure regulator with wrench when connecting it to gas piping and/
or fittings.
* An A.G.A. design-certified manual shutoff valve with 1/8" NPT tap is an acceptable
alternative to test gauge connection. Purchase the optional A.G.A. design-certified manual
shutoff valve from your dealer. See Accessory, page 15.
Tee
Joint
Pipe
Nipple
Cap
Pressure
Regulator
Heater
Cabinet
Tee Joint
Reducer
Bushing to
1/8" NPT
1/8" NPT
Plug Tap
Test
Gauge
Connection *
Ground Joint Union
3/8" NPT
Pipe
Nipple
Figure 12 - Gas Connection
Sediment Trap
3" Minimum
Manual Shutoff Valve *
From Gas
Meter
(4" W.C. to
10.5" W.C.
Pressure)
CONNECTING TO
GAS
SUPPLY
NOTICE: A qualified service per-
son must connect heater to gas
supply. Follow all local codes.
IMPORTANT: Check 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.
Installation must include a manual shutoff
valve, ground joint 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 12).
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 12. Locate sediment trap where it
is within reach for cleaning. Locate sedi-
ment 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.
WARNING: Never connect
heater to private (non-utility) gas
wells. This gas is commonly
known as well-head gas.
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 3/8" diameter or
greater to allow proper gas vol-
ume to heater. If pipe is too small,
undue loss of pressure will oc-
cur.
CAUTION: Use pipe joint seal-
ant that is resistant to liquid pe-
troleum (LP) gas.