8
Servicing should only be performed by a Qualied Service Technician
To trap any dirt or foreign material in the gas supply line, a sediment trap must be incorporated in the piping
(see Figure below). The sediment trap must be readily accessible and not subject to freezing conditions.
Install in accordance with recommendations of serving gas suppliers. Refer to the latest version of the
National Fuel Gas Code.
To prevent damage, care must be taken not to apply too much torque when attaching gas supply pipe to
gas valve inlet. Apply joint compounds (pipe dope) sparingly and only to the male threads of pipe joints. Do
not apply compounds to the rst two threads. Use compounds resistant to the action of liqueed petroleum
gases.
Be sure the gas meter has sufcient capacity to supply the full rated gas input of the water heater as well as
the requirements of all other gas red equipment supplied by the meter. If gas meter is too small, ask the gas
company to install a larger meter having adequate capacity.
GAS PIPING AND SEDIMENT TRAP INSTALLATION
Fire and Explosion Hazard
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.
Use joint compound or Teflon tape
compatible with propane gas.
Any time work is done on the gas supply system perform a leak test to avoid the possibility of re 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 above. 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. Coat all supply gas line joints and connections upstream of the water heater with a non-corrosive 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.
PURGING
Gas line purging is required with new piping or systems in which air has entered.
Purging should be performed per the current edition of NFPA 54 the National Fuel Gas Code.
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