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SECTION VII: GAS CONNECTIONS
WARNING
Connect this water heater only to the type of gas as shown on the rating plate. Use clean black iron pipe or
equivalent material approved by local codes and ordinances. (Dirt and scale from the pipe can enter the gas valve
and cause it to malfunction). The inlet gas line must have at least a 3 inch (7.62 cm) drip leg (sediment trap)
installed as close to the water heater’s gas valve as possible. A ground joint union must be installed in the gas
supply line, as close to the water heater as possible, to permit servicing of the water heater. Compounds used on
the threaded joints of the gas piping must be resistant to the action of liquefied petroleum gases/propane gas. DO
NOT apply pipe dope to the gas valve inlet and make certain that no pipe dope has become lodged in the inlet
screen of the gas valve. Extreme care must be taken to ensure no pipe dope enters the gas valve and to avoid
excessive torque when tightening the gas supply line to the gas valve. Excessive torque may result in cracking of
the gas valve housing. The suggested maximum torque is 31.5 foot lbs. (4.4 kg-m). The manufacturer of this
water heater will not be liable for any damage or injury caused as a result of a cracked gas inlet as a result of
excessive torque.
This water heater and its gas connection must be leak tested before placing the water heater in operation. Check
for gas leaks with a soap and water solution and a brush or a commercial leak detector fluid.
NEVER USE A MATCH OR OPEN FLAME FOR TESTING!
The water heater is not intended for operation at higher than 14.0 inch water column (½ psi) supply gas pressure.
Higher gas supply pressures require supplemental reducing service regulation. Exposure to higher gas supply
pressure may cause damage to the gas controls, which could result in fire or explosion. If overpressure has
occurred such as through improper testing of gas lines or emergency malfunction of the supply system, the gas
valve must be checked for safe operation. Make sure that the outside vents on the supply regulators and the
safety vent valves are protected against blockage. These are parts of the gas supply system, not the water heater.
CAUTION
The water heater and individual shutoff valve must be disconnected from the gas supply piping system during any
pressure testing of the system at test pressures in excess of ½ psi (3.5 kPa). The water heater must be isolated
from the gas supply piping system by closing its manual shutoff valve during any pressure testing of the gas supply
system at test pressures equal to or less than ½ psi (3.5 kPa). The supply line must be capped when not
connected to the water heater.
If copper supply lines are used, they must be internally tinned and certified for gas service.
Figure 24. Drip Leg
The gas supply lines must meet all requirements of the National Fuel Gas Code ANSI Z223.1 (Latest Edition), or in
Canada CAN/CGA B149.1 Natural Gas Installation Code (Latest Edition) or CAN/CGA B149.2 Propane Installation Code
(Latest Edition).