Weil-McLain NX Start the Burner and Set Combustion, Head/air Adjustment Plate Assembly, Page

Start the Burner

Start the Burner and Set Combustion

•Start-up and Initial Settings

1.Open the shutoff valves in the oil supply line to the burner.

2.Referencing Figure 5 verify and/or set the Head/ Air Adjustment Pointer to the value shown in Table 1. This is an initial air setting for the pump bleeding procedure only. Calibrated test instru- ments must be used for the final head/air adjust- ment.

3.Set the thermostat substantially above room temperature.

4.Close the line voltage switch to start the burner. If the burner does not start within the 3 to 10 second safety start check timing, you may have to reset the safety switch on the burner primary control.

5.Bleed the air from the fuel pump as soon as the burner motor begins rotating.

!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

Page 12

Step 1: To bleed the fuel pump, attach a clear plastic hose over the vent fitting. Loosen the fit- ting and catch the oil in an empty container. Tight- en the fitting when all the air has been purged from the oil supply system.

Step 2: If the burner locks-out on safety during bleeding, reset the safety switch and complete the bleeding procedure. Note — For R7184 pri- mary controls, see Technician’s Quick Reference Guide, part number 61351 or 61465, for special pump priming sequence.

Step 3: If the burner stops after a flame is estab- lished, additional bleeding is probably required. Repeat the bleeding procedure until the pump is primed and a flame is established when the vent fitting is closed.

6.Prepare for combustion tests by drilling a 1/4” sampling hole in the flue pipe between the appli- ance and the barometric draft regulator. Seal this hole when testing is complete. (See appliance manufacturer for location.)

7.Loosen the splined nut approximately one turn. (DO NOT loosen the upper acorn nut. This is used only for setting the zero adjustment.) (See Figure 5.)

8.A 5/16” nut driver or flat blade screwdriver can be used to turn the adjustment screw for head/air setting.

Figure 5. – Head/air Adjustment Plate Assembly

	Scale
Upper Acorn Nut	Pointer
(Lock Zero
Calibration)

Splined

Nut

Adjustment

Nut

Lower Acorn Nut	SK9667
(Lock Air Setting)

WM 550-141-996/1105

RWB 6104WMNX R1005