Gas Supply Pressure, Gas line purging

This gas piping must be installed in accordance with all local and provincial or state codes or, in the absence of such, the latest edition of "Natural Gas and Propane Installation Code" CAN/CSA-B149.1(Canada), or "National Fuel Gas Code" ANSI Z223.1 (NFPA 54) (U.S.A.).

Use properly sized gas piping to ensure full gas input and a properly sized gas supply regulator to ensure adequate gas supply pressure. The supply piping and regulator must be large enough to satisfy the requirements of all appliances connected to the gas service when all appliances are oper- ating simultaneously. Undersized piping and insufficient pressure can restrict the gas flow causing the water heater to perform poorly. Improperly sized piping may pose a safe- ty hazard.

Note: When installing gas piping, apply sealing compounds approved for use with natural and propane gas.

1.Install a readily accessible manual shut-off valve in the gas supply line as recommended by the local utility. The owner/operator must be shown the location of this valve and be given instructions on how to use it to shut off the gas to the heater.

2.Install a drip leg (if not already incorporated as part of the water heater) as shown. The drip leg must be no less than 76mm (3 in.) long for the accumulation of dirt, foreign material, and water droplets.

3.Install a ground joint union, or other approved gas dis- connect, between the gas control/thermostat and the manual shut-off valve. This is to allow easy removal of the gas control/thermostat.

4.Turn the gas supply on and check for leaks. Use a chlo- ride-free soap and water solution (bubbles forming indi- cate a leak) or other approved method.

WARNING

Exposure to a higher gas supply pressure may cause damage to the control, resulting in explosion or fire. Consult your local gas supplier and gas authorities. DO NOT PUT INTO SERVICE IF OVER-PRESSURIZATION HAS OCCURRED.

Gas Supply Pressure

Important: The gas supply pressure must not exceed the maximum supply pressure as stated on the water heater's data plate.

Gas line purging

Air may be present in the gas lines and could prevent the burner from lighting on initial start-up. The gas lines should be purged of air by a qualified service technician after instal- lation of the gas piping system.

Gas Leak Testing

Important: This water heater and its gas connection must be leak tested before placing the appliance in operation.

•If the code requires the gas lines to be tested at a pres- sure exceeding 14 in. w.c. (3.5 kPa), the water heater and its manual shut-off valve must be disconnected from the gas supply piping system and the line capped.

•If the gas lines are to be tested at a pressure less than 14 in. w.c. (3.5 kPa), the water heater must be isolated from the gas supply piping system by closing its manu- al shut-off valve.

Gas Operating Pressures

The gas supply pressure and burner manifold pressure is listed on the data plate located on the front of the heater above the gas control/thermostat. Ensure the gas supply pressure to the water heater and the burner manifold pres- sure are properly adjusted while all appliances are in oper- ation. Refer to Figure 22 (Robertshaw) or Figure 24 (White- Rodgers) for Gas Control/Thermostat Details.

U.L.and CSA recognized fuel gas and Carbon Monoxide (CO) detectors are recommended in all applications and should be installed using the manufacturer's instructions and local codes, rules or regulations.

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