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AP18733 REV. 3.2.17
42
▪ B. GAS CONNECTION REQUIREMENTS
1. The gas connection tting on the water heater is ¾″ (1.9 cm) female NPT. NOTE: The pipe size must not be less than ¾″ (1.9 cm).
2. The supply line must be sized for the maximum output of the water heater being installed. If there are additional gas appliances from the
main supply line, measure the size of the supply line according to the COMBINED total maximum BTUH draw for the appliances as if they were
operating at the same time.
3. Measure the length of the gas supply line from the gas meter to the water heater. Water heater must be installed downstream of the gas meter to
ensure adequate gas supply. Use the tables in this manual or refer to the gas line manufacturer’s sizing information to determine the correct supply
pipe size.
4. A manual gas shut-off valve should be installed in the gas supply line close to the water heater. See Figure 18 for detail.
5. To facilitate any future maintenance, it is also recommended that an approved gas union tting be installed in the supply line between the shut-
off valve and the ¾″ (1.9 cm) female NPT connection on the water heater.
Figure 18 – Gas Line With Shut-Off Valve Detail
6. Test the gas pressure to make sure it meets the minimum standards and does not exceed the maximum standards of the water heater.
7. Leak test the gas line pipe before placing the water heater in operation. Only use approved leak detector liquid solutions to check for leaks.
8. A properly sized gas regulator must be installed 18" away from the water heater.
9. Do not operate the water heater until all connections have been completed and the heat exchanger is lled with water.
Figure 19 – Natural Gas Piping Installation – NOTE: Capacity to be not Less than Total Capacity of Connected Appliances
GAS VALVE OFF
GAS VALVE ON
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