State SSX100 - Manual (Page 38)

38
gAs LInE COnnECtIOn
1. The water heaters covered by this manual are shipped from
the factory with 3/4 inch supply gas connections. The supply
gas line must not be smaller than 3/4 inch, see Supply Gas
regulator on page 13. Connect the supply gas line to
the water heater's 24 Volt Gas Valve in accordance with all
applicable local and national code requirements. dO nOt
use flexible gas piping.
2. Depending on the developed equivalent length and/or the
number of appliances connected to a common main, the
size of the supply gas line may have to be increased, see
Gas line Sizing on page 37. If the supply gas line must
be re-sized larger to accommodate increased supply gas line
lengths or multiple appliances use reducer couplings and
short pipe nipples to increase the supply gas line as shown
in Figure 49.
nOtE: Make the transition to the larger supply gas line as
close to the supply gas connection as possible.
FIELD INSTALLED
PIPE NIPPLE
INSTALL A REDUCER
COUPLING WHEN A
LARGER SUPPLY GAS
LINE IS REQUIRED
SUPPLY GAS LINE CONNECTION
120,000 Btu/hr MODELS
24 VOLT
GAS VALVE
TO MAIN
BURNER
FLOW
figure 49
3. Apply thread sealing compounds (pipe dope/Teflon tape)
sparingly and only to the male threads of the pipe joints. Do
not apply sealing compound to the first two threads. use pipe
dope or Teflon tape marked as being resistant to the action of
liquid petroleum (lP/propane) gases.
4. use only a smooth jaw adjustable wrench (such as a monkey
wrench) as a back up on the body of the 24 Volt Gas Valve
when tightening the first pipe nipple into the body of the valve.
dO nOt use a standard pipe wrench (Stillson wrench) with
metal tooth jaws as this may permanently damage the valve.
5. use a standard pipe wrench (Stillson wrench) as a back
up on the first pipe nipple installed above when connecting
other fittings and pipe in the supply gas line to prevent the
24 Volt Gas Valve on the water heater from twisting during
installation.
6. To prevent damage, care must be taken not to apply too
much torque when connecting the supply gas line to the
water heater.
7. Install a sediment trap (drip leg) as shown in Figure 48 on
page 37.
8. Install a main Gas Shutoff valve in the supply gas line as
shown in Figure 48 on page 37.
nOtE: Should overheating occur or the gas supply fail to shut
off, turn off the main Gas Shutoff valve to the water heater.
gAs LInE LEAk tEstIng
Fire and Explosion Hazard
Use joint compound or Teflon tape
compatible with propane gas.
Leak test before placing the
water heater in operation.
Disconnect gas piping and main
gas shutoff valve before leak
testing.
Install
sediment trap in
accordance with NFPA 54.
Any time work is done on the gas supply system perform a leak
test to avoid the possibility of fire or explosion.
1. For test pressures exceeding 1/2 psi (3.45 kPa) disconnect
the water heater and its main Gas Shutoff Valve from the
gas supply piping system during testing, see Figure 48
on page 37. The gas supply line must be capped when
disconnected from the water heater.
2. For test pressures of 1/2 psi (3.45 kpa) or less, the water
heater need not be disconnected, but must be isolated from
the supply gas line by closing the main Gas Shutoff Valve
during testing.
3. Paint all supply gas line joints and connections upstream of
the water heater with a rich soap and water solution to test
for leaks. bubbles indicate a gas leak. Do not use matches,
candles, flame or other sources of ignition for this purpose.
4. repair any leaks before placing the water heater in operation.