Weil-McLain UO-3 CV, Instruction Manual

Page: 18 / 24

18
Check the pump pressure and cutoff function.
Check primary control safety lockout timing.
Check ignition system for proper operation.
Inspect and clear the vent system and chimney of
any soot accumulation or other restriction.
Clean all fl ue passages and fl ue pipe. Replace
corroded or damaged pipes.
Clean the appliance thoroughly according to the
manufacturer’s recommendations.
Check the burner performance. Refer to the section
“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
(Reference the Replacement Parts Diagram.)
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Before proceeding, turn off the main power switch
to the burner.
Remove the burner cover by loosening the four
thumb screws (two on each side of burner).
Disconnect the copper connector tube assembly
from the nozzle line bulkhead
fi tting.
Loosen the two screws securing the igniter
retaining clips and rotate both clips to release the
igniter baseplate. The igniter should pop up and be
supported by the prop spring.
1.
2.
3.
4.
Use only nozzles having the brand, fl ow rate (gph),
spray angle and pattern speci fi ed by the appliance
manufacturer or Beckett Residential Burner OEM Spec
Guide, Part #6711.
Follow the appliance manufacturer’s speci fi cations for
the required pump outlet pressure for the nozzle, since
this affects the fl ow rate.
Nozzle manufacturers calibrate nozzle fl ow rates at
100 psig.
This burner utilizes pressures higher than 100 psig,
so the actual nozzle
fl ow rate will be greater than the
gph stamped on the nozzle body. (Example: A 1.00
gph nozzle @ 140 psig = 1.18 gph)
For typical nozzle fl ow rates at various pressures see
accompanying chart.
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Incorrect nozzles and fl ow rates could
result in impaired combustion, under-
fi ring, over-fi ring, sooting, puff-back of
hot gases, smoke and potential fi re or
asphyxiation hazards.
Correct Nozzle and Flow
Rate Required
Loosen the two screws securing the rear door.
Swing the door to the right and down.
Loosen the splined nut.
Remove the nozzle line electrode and head
assembly from the burner by drawing it straight
back and out the rear door opening. The
adjustment mechanism is still attached. Be careful
not to damage the electrodes or insulators while
handling.
To replace the nozzle assembly, reverse the above
procedure.
Nozzle Installation
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Disconnect electrical power before installing or servicing
the burner.
Provide ground wiring to the burner, metal control
enclosures and accessories. (This may also be required
to aid proper control system operation.)
Perform all wiring in compliance with the National
Electrical Code ANSI/NFPA 70 (Canada CSA C22.1)
Electrical shock can cause severe personal
injury or death.
Electrical Shock Hazard
Use care when handling, removing and installing oil
nozzles.
Carefully follow the guidelines provided in this
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A damaged nozzle could cause impaired combustion,
sooting, puffback of hot gases, smoke, oil leakage
and potential fi re or asphyxiation hazards.
Protect Nozzle from
Damage
Section: Trained Service Technician’s Regular Maintenance