Weil-McLain NX manual Check/Adjust Electrodes, Check/Adjust Zero Calibration

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Professional Maintenance

•Check/Adjust Electrodes

Check the electrode tip settings, as shown in Fig- ure 7. If necessary, adjust by loosening the elec- trode clamp screw (Figure 8) and slide/rotate the electrodes as necessary. When the adjustment is complete, securely tighten the clamp screw.

•Check Retention Head Alignment and Cad Cell Sighting (Refer to Figure 9.)

The cad cell sighting holes in both the throttle cup and the retention head must be aligned to allow the cad cell to detect the flame. Make sure the stamped key in the retention head collar lines up with the keyway in the nozzle adapter when mounting the retention head.

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.

•Check/Adjust “Zero” Calibration

On burners with factory-installed air tubes, the zero calibration has been factory set. Make sure the retention head (Figure 8) is securely against the stops in the retention ring when the adjustment plate pointer is at “0” (Figure 5).

If the zero calibration has not been set, perform the following procedure:

1.Install the nozzle line, with the adjustment plate assembly attached, into the burner.

2.Install and tighten the rear door to hold the air adjustment plate assembly in position.

3.Slightly loosen the upper acorn nut, the splined nut, and the lower acorn nut.

4.Turn the air adjustment screw clockwise to adjust the plate with the pointer to the zero position.

5.Referring to Figure 8, slide the nozzle line as- sembly forward until the retention head engages the fixed stops in the retention ring at the end of the air tube.

6.Tighten the upper acorn nut securely.

7.The rear door must be kept tightly closed. The adjustment screw may now be turned to adjust the head/air setting.

8.Turn the adjusting screw to a setting ½ number lower than the proper set point as indicated in Table 1. Then turn the adjusting screw counter- clockwise to the proper setting.

9.Tighten the splined nut and lower acorn nut after the head/air setting has been adjusted.

Figure 9 – Retention Head/Throttle Cup Alignment

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SK9665

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

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Contents Beckett Model NX Burner Table of Contents Information To Be Used Only By Qualified Service TechniciansGeneral Information To the Owner Hazard DefinitionsResponsibilty NX Burner Specifications for Weil-McLain Ultra Oil Boilers Burner ConfigurationsGeneral Specifications General SpecificationsBurner Specifications Air Tube Combination ATC codesBurner label location Inspect/Prepare Installation Site Site PreparationSupply Required Possible Sooting Asphyxiation HazardSystem Wiring Fuel Line InstallationFuel Line Valves and Filter Pressure Control Required Prepare the BurnerBurner Preparation Pipe System Burner Preparation Burner ConnectionsTypical Burner Wiring & Burner Sequence of Operation Start the Burner Start-up and Initial SettingsStart the Burner and Set Combustion Cover Installation Set Combustion with Test InstrumentsTrained Service Technician’s Regular Maintenance Professional MaintenanceService Required Nozzle Installation Electrode tip gap and spacingCheck/Adjust Electrodes Check/Adjust Zero CalibrationBlower wheel assembly Blower Wheel ReplacementReplacement 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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