Supply Gas Regulator Installation - State Water Heaters SUF-100-250 Instruction Manual

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 Table 5 on
page 14. 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 39. 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 53.
note: make the transition to the larger supply gas line as
close to the supply gas connection as possible.
INSTALL A REDUCER
COUPLING WHEN A
LARGER SUPPLY GAS
LINE IS REQUIRED
FIELD INSTALLED
PIPE NIPPLE
SUPPLY GAS LINE CONNECTION
120,000 & 150,000 Btu/hr MODELS
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.
LOW GAS PRESSURE
SWITCH
COMBUSTION
BLOWER
SUPPLY GAS LINE CONNECTION
199,000 & 250,000 Btu/hr MODELS
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
TO MAIN
BURNER
FLOW
24 VOLT
GAS VALVE
figure 53
SUPPLY GAS CONNECTION
FACTORY INSTALLED
TEE FITTING
figure 54
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 (dirt leg) as shown in Figure 52 on
page 39.
8. Install a main Gas Shutoff valve in the supply gas line as
shown in Figure 52 on page 39.
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
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 52 on page 39.
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 appliance
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.

supply gas regulator installation

The water heaters covered in this manual must have a supply
gas regulator installed in the supply gas line connected to the
water heater. See the installation requirements on page 14.
1. A supply gas regulator shall be installed for each water heater
on multiple water heater installations.
2. Supply gas regulators must be rated at or above the input
Btu/hr rating of the water heater they supply.
3. Supply gas regulators shall have inlet and outlet connections
not less than the minimum supply gas line size for the water
heater they supply. See Table 5 on page 14.
The maxitrol 325-7L supply gas regulator or equivalent is
recommended.
4. Supply gas regulator(s) shall be installed no closer than 3
feet (1 meter) and no farther than 10 feet (3 meters) from the
supply gas connection on the water heater.
40
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.