Professional Maintenance

Trained Service Technician’s Regular Maintenance

While performing routine maintenance check the following.

Replace the oil supply line filter. The line filter car- tridge must be replaced to avoid contamination of the fuel pump and nozzle.

•Inspect the oil supply system. All fittings should be tight and leak-free. The supply lines should be free of water, sludge and other restrictions.

•Remove and clean the pump strainer if applica- ble.

•Replace the used nozzle with a new nozzle per appliance manufacturer’s specifications.

•Clean and inspect the electrodes for damage, re- placing any that are cracked or chipped.

•Check electrode tip settings. Replace electrodes if tips are rounded.

•Inspect the igniter spring contacts.

•Clean the cad cell grid surface, if necessary.

•Make sure Low Firing Rate Baffle is in place if required for the burner application. Omitting the baffle can result in unacceptable burner combus- tion.

•Inspect all gaskets. Replace any that are dam- aged or would fail to seal adequately.

•Clean the blower wheel, air inlet, air guide, reten- tion head, throttle plate and throttle ring of any lint or foreign material.

•Check motor current. The amp draw should not exceed the nameplate rating by more than 10%.

•Check all wiring for secure connections or insula- tion breaks.

•Check the pump pressure and cutoff function.

•Check primary control safety lockout timing.

•Check ignition system for proper operation.

•Inspect the vent system and chimney for soot ac- cumulation or other restriction.

•Clean the appliance thoroughly according to the manufacturer’s recommendations.

•Check the burner performance. Refer to the sec- tion “Set combustion with test instruments”.

•It is good practice to keep a record of the service performed and the combustion test results.

•Removing Nozzle Line for Service (Refer- ence the Replacement Parts drawing.)

1.Before proceeding, turn off the main power switch to the burner.

2.Remove the burner cover by loosening the four thumb screws (two on each side of burner).

!Warning–Professional

Service Required

This equipment must be installed, adjusted and put into operation only by a qualified individual or service agency that is:

x Licensed or certified to install and provide technical service to oil heating systems.

x Experienced with all applicable codes, standards and ordinances

x Responsible for the correct installation and commission of this equipment

x Skilled in the adjustment of oil burners using combustion test instruments.

The installation must strictly comply with all applicable codes, authorities having jurisdiction and the latest revision of the National Fire Protection Association Standard for the Installation of Oil-Burning Equipment, NFPA 31 (or CSA B139 and B140 in Canada).

Regulation by these authorities take precedence over the general instructions provided in this installation manual.

Read and understand the manual supplied with this equipment. Incorrect installation, adjustment, and use of

this burner may result in severe personal injury death, or substantial property damage from fire, carbon monoxide poisoning, soot or explosion.

S105

3.Disconnect the copper connector tube assembly from the nozzle line bulkhead fitting.

4.Loosen the two screws securing the igniter re- taining clips and rotate both clips to release the igniter baseplate. The igniter should pop up and be supported by the prop spring.

5.Loosen the two screws securing the rear door. Swing the door to the right and down

6.Loosen the splined nut.

7.Remove the nozzle line electrode and head as- sembly from the burner by drawing it straight back and out the rear door opening. The adjust- ment mechanism is still attached. Be careful not to damage the electrodes or insulators while han- dling.

8.To replace the nozzle assembly, reverse the above procedure.

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Weil-McLain NX manual Professional Maintenance, Trained Service Technician’s Regular Maintenance, Service Required
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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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