Weil-McLain UO-5 CV, UO-4 CV, UO-3 CV manual Check/Adjust ‘Z’ Dimension L1 & L2 Heads

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Prepare the Burner

Figure 5. Check/Adjust ‘Z’ Dimension - L1 & L2 Heads

L1/L2 heads (see Table 7 and Figure 3 for dimensions)

1.See figure above. The important “Z” dimension is the distance from the leading edge of the head to the end of the air tube. This distance for L1 & L2 heads is 1-⅜” if the tube has a straight shroud or 1-¾” if the air tube has a conic shroud. The “Z” dimension is factory set for

burners shipped with the air tube installed. Even if factory set, verify that the “Z” dimension has not been changed.

2.Use the following procedure to adjust the “Z” dimension, if it is not correct:

yTurn off power to the burner.

yDisconnect the oil connector tube from the nozzle line.

yRefer to figure. Loosen the splined nut from the nozzle line. Loosen the hex head screw securing the escutcheon plate to the burner housing.

yPlace the end of a ruler at the leading edge of the head and, us- ing a straight edge across the end of the air tube, measure the distance to the end of the tube. A Beckett T501 gauge may also be used.

ySlide the nozzle line forward or back until this dimension is 1-⅜” for L1 & L2 heads if the tube has a straight shroud, or 1-¾” if the air tube has a conic shroud.

yTighten the hex head screw to secure the escutcheon plate to the burner chassis. Then tighten the splined nut and attach the oil connector tube.

3.Recheck the “Z” dimension periodically when servicing to ensure the escutcheon plate has not been moved. You will need to reset the “Z” dimension if you replace the air tube or nozzle line assem- bly.

Figure 6. Check/Adjust ‘Z’ Dimension - V1 Heads

V1 heads (see Table below and Figure above for dimensions)

1.See figure above. The important “Z” dimension is the distance from the leading edge of the head to the end of the air tube. This distance for V1 heads is 1-¾”. The “Z” dimension is factory set for burners shipped with the air tube installed. Even if factory set, verify that the “Z” dimension has not been changed.

2.Use the following procedure to adjust the “Z” dimension, if it is not correct:

yTurn off power to the burner.

yDisconnect the oil connector tube from the nozzle line.

ySee figure above. Loosen the splined nut from the nozzle line. Loosen the hex head screw securing the head adjusting plate to the burner housing.

yLoosen the acorn nut. Move the head adjusting plate until the “0” lines up with the reference indicator on the housing, and retighten the hex head screw. Place the end of a ruler at the leading edge of the head and, using a straight edge across the end of the air tube, measure the distance to the end of the tube. A Beckett T501 gauge may also be used.

ySlide the nozzle line forward or back until this dimension is 1-¾” for V1 heads. Tighten the acorn nut.

yTighten the hex head screw to secure the head adjusting plate to the burner chassis. Then tighten the splined nut and attach the oil connector tube.

3.Recheck the “Z” dimension periodically when servicing to ensure the escutcheon plate has not been moved. You will need to reset the “Z” dimension if you replace the air tube or nozzle line assembly.

Set head position adjusting plate (V1 head only)

Table for initial adjusting plate settings for V1

 

 

Head

 

 

 

1.

After setting “Z” dimension, loosen head adjusting plate hex head

V1 Adjusting

AFG with V1

 

 

 

 

screw and nozzle line splined nut. Move the nozzle line assembly until

 

Plate Setting

Head

 

 

the burner reference indicator lines up with the head adjusting plate

 

 

Burner Firing

 

 

setting number given in Table shown below.

 

 

Rates

 

2.

Tighten the hex head screw and splined nut. (DO NOT loosen the

 

0

0.75-1.00

 

 

acorn nut when setting head position.) Refer to the manufacturer’s in-

 

 

 

 

 

 

1

1.00-1.50

 

 

structions for OEM settings.

 

 

 

 

 

 

 

 

 

2

1.50-1.75

 

3.

The position of the head affects air flow volume and pattern. For most

 

 

 

applications, the burner will perform satisfactorily with the air adjust-

 

3

1.75-2.00

 

 

ment plate setting of Table shown below.

 

4

2.00-2.25

 

4.

If combustion results indicate the need for change, adjust the head po-

 

 

 

 

 

5

2.25-2.50

 

 

sition adjusting plate forward or back one position at a time to optimize

 

 

 

 

6

2.50-2.75

 

 

combustion.

 

 

 

 

 

 

 

 

6104BAFG R06

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Contents R02 01/09 To the Professional, Qualif ed Installer or Service Agency Potential for Fire, Smoke and Asphyxiation HazardsTo the Homeowner or Equipment Owner Table of Contents Information To Be Used Only By Qualif ed Service TechniciansFeature Hazard DefinitionsGeneral Information Indicates a hazardous situGeneral Information To the Owner Burner Specif cationsWeekly General Specifications Air Tube Combination ATC codesInspect/Prepare Installation Site Inspect Chimney or Direct Vent System Tion HazardChamber Dimensions Clearances to burner and applianceCombustion chamber Burner retrof t- ting NozzleInspect/Prepare Installation Site Prepare the Burner Prepare the Burner Mount burner on applianceCheck/Adjust ‘Z’ Dimension ‘F’ heads Burner DimensionsCheck/Adjust ‘Z’ Dimension L1 & L2 Heads Installing the Oil Tank and Supply System Fuel Line Valves and FilterWire burner Burner installed at jobsiteSpecial wiring required with covered burners Frozen Plumbing Water Damage HazardWiring FeaturesBurner Controls GeniSys Model 7505 Control Fire or Explosion HazardBurner Controls Reset Button Operation Light Color On Continuously FlashingTypical Burner Wiring Control System FeaturesCad Cell Resistance Indicator Resetting From Restricted or Hard LockoutStart up burner/set combustion Hot Gas Puff-Back Heavy Smoke HazardCheck Safety Features Startup / CheckoutStartup/Checkout Set combustion with instrumentsPerform regular maintenance Shutting the Burner OffBlower wheel assembly Replace the blower wheelPage Description Warranty

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