7 Gas connections
Connecting gas supply piping
1.Remove the top access panel and refer to FIG.’s
a.Install ground joint union for servicing, when required.
b.On Models 151 - 400 install a manual shutoff valve in the gas supply piping outside water heater jacket when required by local codes or utility requirements.
c.In Canada – When using manual main shutoff valves, it must be identified by the installer.
2.Install sediment trap / drip leg.
Figure 7-1 Gas Supply Piping - Models 151 - 200
UNION
GAS SUPPLY
DRIP LEG 
MANUAL
SHUT OFF
VALVE
Installation & Operation Manual
Figure 7-3 Gas Supply Piping - Model 501
UNION (FACTORY INSTALLED)
MANUAL SHUTOFF VALVE (FACTORY SUPPLIED)
GAS SUPPLY 
SEDIMENT TRAP/ 
DRIP LEG
Figure 7-4 Gas Supply Piping - Models 601 - 801
UNION (FACTORY INSTALLED)
MANUAL SHUTOFF VALVE (FACTORY SUPPLIED)
GAS SUPPLY
SEDIMENT TRAP/
DRIP LEG
3.Support piping with hangers, not by the water heater or its accessories.
Figure 7-2 Gas Supply Piping - Models 286 - 400
WARNING
The gas valve and blower will not support the weight of the piping. Do not attempt to support the weight of the piping with the water heater or its accessories. Failure to comply could result in severe personal injury, death, or substantial property damage.
SEDIMENT TRAP / DRIP LEG 
44 
4.Purge all air from the gas supply piping.
5.Before placing the water heater in operation, check the water heater and its gas connection for leaks.
a.The appliance must be disconnected from the gas supply piping system during any pressure testing of that system at a test pressure in excess of 1/2 PSIG (3.5 kPa).
b.The appliance must be isolated from the gas supply piping system by closing a manual shutoff valve during any pressure testing of the gas supply piping system at test pressures equal to or less than 1/2 PSIG (3.5 kPa).
c.The appliance and its gas connection must be leak tested before placing it in operation.
