Installation Considerations

Gas AND ELECTRICAL CHARACTERISTICS

MODELS	GAS TYPE	GAS SUPPLY PRESSURE		VOLTS/HZ	AMPERES
		MINIMUM	MAXIMUM

All Models	Natural	3.5" WC (0.87 kPa)	14.0" WC (3.48 kPa)	120/60	< 5

All models require a minimum gas supply pressure of 3.5” W.C. The minimum supply pressure is measured while gas is flowing (dynamic pressure). The supply pressure (dynamic) should never fall below 3.5” W.C. The supply pressure should be measured with all gas fired appliances connected to the common main firing at full capacity. If the supply pressure drops more than 1.5” W.C. as gas begins to flow to the water heater then the supply gas system including the gas line and/or the gas regulator may be restricted or undersized.

The gas valve on all models has a maximum gas supply pressure limit of 14" W.C. The maximum supply pressure is measured while gas is not flowing (static pressure).

GAS PRESSURE – REQUIREMENTS

Main line gas pressure to the water heater for natural gas should be between a maximum of 14" w.c. (3.48 kPa) static pressure and a minimum of 3.5" w.c. (0.87 kPa) dynamic pressure for Natural Gas.

A supply gas pressure regulator ( service regulator ) must be installed on the gas supply line if the static pressure exceeds 14” w.c. and it should be installed no closer than 3 feet (1 meter), but no farther than 8 feet (2.4 meters) of equivalent length from the water heater’s inlet gas connection.

1.Check gas line pressure with a manometer.

2.Cycle the burner on and off several times to check its operation.

3.Check the operation of the limit and operating controls.

4.Check the vent system seams and joints and ensure that there is no discharge of flue products into the room.

5.Check the input rate.

Supply gas pressure shall be measured while the water heater is not firing (static pressure) and while the water heater is firing at full capacity (dynamic pressure). If the supply gas pressure to the water heater is not between the required minimum and maximum values given in table above, adjust the supply gas regulator as necessary. Adjust the supply gas regulator(s) per the regulator manufacturer’s instructions to achieve the required “static” and “dynamic” supply gas pressure.

MULTIPLE APPLIANCE INSTALLATIONS:

In multiple water heater installations or in installations where the installed water heater(s) share a common gas supply main with other gas fired appliances; the supply gas pressures shall be measured at each water heater with all gas fired appliances connected to a common main firing at full capacity.

In multiple water heater installations the supply gas line regulators shall be adjusted to provide gas pressure to each water heater within the minimum and maximum supply pressure requirements listed in table above with all gas fired appliances connected to a common gas main firing at full capacity.

Note: A pressure drop of more than 1.5” W. C. (0.37 kPa) when the main burner ignites is an indication of an inadequate supply of gas and can lead to ignition failure, rough starts and/or rough operation. If a drop of more than 1.5” W. C. (0.37 kPa) in supply gas pressure occurs when the main burner ignites, ensure the supply gas lines and regulator(s) are properly sized and installed.

4	Servicing should only be performed by a Qualified Service Technician

381T1546NOX, 395T1996NOX, BCL, 381T1206NOX, 395T2506NOX specifications

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Safety is another crucial characteristic of the Ultra Low NOx Series. Each model is equipped with safety features such as a flame rollout switch and a fully automatic gas shut-off, which ensure that the system operates safely under various conditions.

In terms of installation and maintenance, these models are designed with user-friendly features, making the process simpler for technicians. The compact design allows for flexible installation options, even in tighter spaces.

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