Weil-McLain NX manual Typical Burner Wiring & Burner Sequence of Operation

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Burner Preparation

Figure 4. – Typical Burner Wiring & Burner Sequence of Operation

R

SOLENOID

VALVE

 

 

BK

BURNER

R7184P Primary Control

 

JUNCTION BOX

 

 

R

LIMIT

 

 

BK

 

 

L1

 

 

 

 

 

W

L2

R

 

 

W1

L2

W

L2

2

BK

W

 

L2

 

 

 

 

 

V VALVE

3/T

W

BL/W

IGNITOR T

G

W

IGNITOR

BURNER

MOTOR

O

Y

Y

MOTOR

BURNER PRIMARY

CONTROL

SEE BOILER INSTRUCTION MANUAL FOR CORRECT WIRING

CAD

CELL

BURNER DISCONNECTS

120 VAC FIELD WIRING

LOW VOLTAGE FIELD WIRING 120 VAC FACTORY WIRING LOW VOLTAGE FACTORY WIRING

PRESSURE SWITCH (DIRECT VENT ONLY)

SK9805

Electrical shock hazard — can cause severe injury or death. Disconnect power before installing or servicing.

Burners with Beckett Clean Cut Pump must be used with a primary control that has a valve-on delay (pre-purge). Controls shown have valve on delay (see control manufacturer’s instructions for timings.)

1.STANDBY. The burner is idle, waiting for a call for heat. When a call for heat is initiated, there is a 2-6 second delay while the control performs a safe start check.

2.VALVE-ON DELAY. The ignition and motor are turned on for a 15 second valve-on delay.

3.TRIAL FOR IGNITION (TFI). The fuel valve is opened. A flame should be established within the 15 second lockout time.

4.LOCKOUT. If flame is not sensed by the end of the TFI, the control shuts down on safety lockout and must be manually reset. If the control locks out three times in a row, the control enters restricted lockout.

5.IGNITION CARRYOVER. Once flame is estab- lished, the ignition remains on for 10 seconds to ensure flame stability before turning off. If the con- trol is wired for intermittent duty ignition, the ignition unit stays on the entire time the motor is running.

6.RUN. The burner runs until the call for heat is sati- fied. The burner is then sent to burner motor off delay, if applicable, or it is shut down and sent to standby.

7.RECYCLE. If the flame is lost while the burner is firing, the control shuts down the burner, enters a 60 second recycle delay, and then repeats the above

ignition sequence. If flame is lost three times in a row, the control locks out to prevent cycling with repetitious flame loss due to poor combustion.

8.BURNER MOTOR-OFF DELAY. The fuel valve is closed and the burner motor is kept on for the selected motor-off delay time before the control re- turns the burner to standby.

61351

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 ContentsResponsibilty Hazard DefinitionsGeneral Information To the Owner Burner Configurations NX Burner Specifications for Weil-McLain Ultra Oil BoilersAir Tube Combination ATC codes General SpecificationsGeneral Specifications Burner SpecificationsBurner label location Possible Sooting Asphyxiation Hazard Inspect/Prepare Installation SiteSite Preparation Supply RequiredFuel Line Valves and Filter Fuel Line InstallationSystem Wiring Burner Preparation Pipe System Prepare the BurnerPressure Control Required Burner Connections Burner PreparationTypical Burner Wiring & Burner Sequence of Operation Start the Burner and Set Combustion Start-up and Initial SettingsStart the Burner Set Combustion with Test Instruments Cover InstallationService Required Professional MaintenanceTrained Service Technician’s Regular Maintenance 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.