Weil-McLain NX Electrode tip gap and spacing, Nozzle Installation, Professional Maintenance, Page

•Nozzle Installation

Obtain a nozzle having the capacity, spray angle, and pattern specified in the appliance manufac- turer’s information or Beckett OEM Specification Guide, Part # 6711.

Make certain the correct nozzle is selected for the actual fuel pump pressure. See Table 1.

Perform the following steps when replacing a noz- zle.

1.Remove the nozzle line assembly to gain access to the nozzle.

2.Use a ¾” open-end wrench to hold the nozzle adapter. DO NOT attempt to remove or replace the nozzle without securing the adapter, as noz- zle alignment could be seriously affected.

3.Do not squeeze the electrodes when handling the nozzle line assembly. Excessive force could change the electrode tip settings or damage the ceramic electrode insulators.

4.Use a 5/8” open-end wrench to carefully remove the existing nozzle.

5.Inspect the nozzle adapter before installing the new nozzle. If it is grooved or scratched on the sealing surface, replace the nozzle line assem- bly. If the surface is damaged, oil could leak at the nozzle to adapter joint, causing serious com- bustion problems.

Professional Maintenance

6.Protect the nozzle orifice and strainer when in- stalling. If the orifice gets dirt in it or is scratched, the nozzle will not function properly.

7.To install a new nozzle, place a ¾” open-end wrench on the nozzle adapter. Insert the nozzle into the adapter and secure finger tight. Finish tightening with a ⅝” open-end wrench. Use care to avoid bending the burner head support legs or electrodes.

Figure 7. – Electrode tip gap and spacing

5/32” GAP

1/4” above

nozzle center

3/32” Nozzle-to-tip

Spacing

SK9664

8.Do not over-torque the nozzle when install- ing. This will cause deep grooves in the nozzle adapter, preventing a seal when a new nozzle is installed.

9.Carefully check and realign the electrode tips af- ter replacing a nozzle, ensuring the electrode set- tings comply with Figure 7.

10.If the head was removed when replacing the noz- zle, carefully reconnect the head to the nozzle adapter. Make sure to align the key in the support leg with the keyway in the nozzle adapter and to butt the head support to the nozzle adapter shoulder, see Figure 8.

Figure 8. – Nozzle Line/Head/Air Tube Assembly (Low firing rate shown.)

Retention Head	Electrode Clamp
Head Support Legs	Electrode Bracket
Electrode Tips	Electrode Insulator
	Electrode Extension Rods
	SK9666A
	Bulkhead Fitting
Nozzle Adapter	Nozzle Line
Nozzle	Throttle Ring
Stops in Retention Ring	Throttle Cup
Retention Ring	SK9666A

WM 550-141-996/1105

RWB 6104WMNX R1005

Page 15