Weil-McLain NX Prepare the Burner, Pressure Control Required, Burner Preparation Pipe System

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Prepare the Burner

•General

In most cases, the burner is ready to mount to the appliance. There can be situations where the burn- er needs to be reconfigured to perform properly in the appliance. Review the appliance manufactur- er’s specifications prior to installing to determine if any modification is required to properly configure the burner. Refer to Table 1.

Instruction on how to perform the following burner preparation tasks can be found in the Professional Maintenance section.

•Remove / install burner nozzle

•Check head/air adjusting plate

•Mount Burner on Appliance

Verify that the air tube installed on the burner pro- vides the correct insertion depth. Bolt the burner to the appliance using the factory-welded flange. Note that the end of the tube will extend into the chamber on UO-4 and UO-5 boilers.

•Connect Fuel Lines

The burner is supplied with either a one-stage pump or a two-stage pump based on the oil supply system requirements. Consult the instructions pro- vided with the pump for installation specifications.

!Caution–Oil Supply

Pressure Control Required

The oil supply inlet pressure to the fuel unit cannot exceed 3 psi. Insure that a pressure-limiting device is installed in accordance with the latest edition of the NFPA 31.

Damage to Pump Seal could cause possible oil leakage and potential fire hazard.

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When installing a one-pipe system, connect the inlet line to the pump inlet. Start the burner. Ar- range the primary burner control for continuous op- eration during priming by pressing the control reset button during prepurge. Open the bleed valve one turn counterclockwise. Prime the system until all air bubbles have disappeared. Tighten the bleed valve securely.

The fuel pump may be installed with gravity feed or lift. The maximum allowable lift for a single pipe installation is 8 ft.

Burner Preparation

!Warning – By-pass Plug in

2 Pipe System

The burner pump is shipped without the by-pass plug installed. You must install this plug on two-pipe oil systems. If the unit is a one-pipe oil system DO NOT install the plug in the pump.

Failure to comply could cause pump seal failure, oil leakage and the potential for a fire and injury hazard.

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When installing a two-pipe system, remove the 1/16” pipe by-pass plug from plastic bag attached to fuel unit. Remove ¼” plug from return port. In- sert and tighten the by-pass plug. Attach return and inlet lines. Start burner. Air bleeding is au- tomatic. Open the easy flow air bleed valve for a faster bleed, if desired. The return line should ter- minate approximately 3-4” above supply line inlet. Failure to do this may introduce air into the system and could result in loss of prime.

•Wiring Connection Diagram

Burner wiring performed at jobsite: Refer to Figure 3, for typical burner interconnect wiring, Burner wiring may vary, depending on the burner specifi- cation. Refer to Figure 4 for burner wiring details.

All wiring must be in accordance with the latest re- vision of National Electric Code NFPA 70 and all local codes and regulations.

The R7184 primary control with valve-on delay and burner motor-off delay, shown in Figure 4, requires a constant 120 volt AC power source supplied to the black wire on the control. The red wire goes to the appliance limit circuit. Please note that other control manufacturers may use different wire colors for power and limit connections.

NOTICE

The NX burner has a reduced diameter air tube, precision-designed air throttle cup and combus- tion head for improved performance. This de- sign provides very accurate control of the air/fuel ratio, but the light reaching the cad cell through small holes in these components is limited. Be- cause of this, the average cad cell resistance may be higher than conventional burners with larger openings.

WM 550-141-996/1105 RWB 6104WMNX R1005

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Contents Beckett Model NX Burner Information To Be Used Only By Qualified Service Technicians Table of ContentsHazard Definitions General Information To the OwnerResponsibilty Burner Configurations NX Burner Specifications for Weil-McLain Ultra Oil BoilersGeneral Specifications General SpecificationsBurner Specifications Air Tube Combination ATC codesBurner label location Site Preparation Inspect/Prepare Installation SiteSupply Required Possible Sooting Asphyxiation HazardFuel Line Installation System WiringFuel Line Valves and Filter Prepare the Burner Pressure Control RequiredBurner Preparation Pipe System Burner Connections Burner PreparationTypical Burner Wiring & Burner Sequence of Operation Start-up and Initial Settings Start the BurnerStart the Burner and Set Combustion Set Combustion with Test Instruments Cover InstallationProfessional Maintenance Trained Service Technician’s Regular MaintenanceService Required Electrode tip gap and spacing Nozzle InstallationCheck/Adjust Zero Calibration Check/Adjust ElectrodesBlower Wheel Replacement Blower wheel assemblyReplacement Parts Diagram Professional Maintenance Warranty

NX specifications

The Weil-McLain NX is a state-of-the-art boiler line that showcases the brand's commitment to energy efficiency, reliability, and innovative technology. Designed for both residential and commercial applications, the NX series is ideal for those seeking powerful heating solutions with minimal environmental impact.

One of the standout features of the Weil-McLain NX is its impressive efficiency rating. The boiler is designed to maximize energy use, ensuring that a greater percentage of fuel is converted into usable heat. This efficiency not only translates to lower utility bills for consumers but also reduces overall carbon emissions, making the NX an eco-friendly choice for heating.

The NX series boasts a robust cast-iron heat exchanger, which is known for its durability and longevity. Cast iron is not only resistant to thermal shock but also provides superior heat retention, enhancing the system's efficiency even further. This heat exchanger design allows for a longer lifecycle and reduced maintenance needs, making it a reliable option for homeowners and businesses alike.

In terms of technology, the Weil-McLain NX comes equipped with advanced control systems that provide precise temperature management and safety features. The intuitive control interface allows for easy adjustments, ensuring that users can tailor their heating experience to their specific needs. Features such as outdoor reset control and multiple stage modulation contribute to optimized performance and energy savings.

The NX is also designed with flexibility in mind. Its compact size allows for installation in a variety of spaces, making it suitable for retrofitting older systems. Additionally, the boiler is compatible with a range of heating applications, from radiant floor heating to baseboard systems, providing versatility in heating configurations.

As for safety, Weil-McLain has incorporated several safety features in the NX series. High-limit controls, flame rollout switches, and low water cutoff devices are standard, ensuring that the system operates safely and efficiently.

In summary, the Weil-McLain NX is a premium choice for anyone in the market for a reliable and efficient heating solution. With its high efficiency, durable construction, advanced technology, and versatile applications, the NX series stands out as a top contender in the boiler market, catering to the demands of modern heating needs while prioritizing sustainability and safety.
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