107273-UUM-C-0306
Unitary Products Group
7
•
Inspect the nozzle adapter before installing nozzle. If it is grooved
or scratched on the sealing surface, replace the nozzle line
assembly. Otherwise, oil could leak at the nozzle adapter joint,
causing serious combustion problems.
•
Protect the nozzle orifice and strainer when installing. If the orifice
gets dirt in it or is scratched, the nozzle will not function properly.
•
Do not over torque the nozzle when installing. This will create
deep grooves in the nozzle adapter, preventing a seal when a
new nozzle is installed.
•
Use a wrench or vise to hold the nozzle adapter. DO NOT attempt
to remove or replace the nozzle without holding the adapter. The
nozzle alignment could be seriously damaged. Use a nozzle
wrench that secures the adapter or use 3/4” and 5/8” open-end
wrenches.
•
Do not squeeze the electrodes too tightly when handling the noz-
zle line assembly. This could change the electrode tip settings or
damage the ceramic electrode insulators.
•
Carefully check and realign electrode tips after replacing nozzle,
ensuring the electrode settings comply with Figure 10.
NOTE: Be extra careful not to hit the electrodes with the wrench when
removing the nozzle. This could cause the insulators to crack or break.
10. Replace the new nozzle with an equivalent nozzle.
11.
Clean and inspect the electrodes for damage, replacing any that
are cracked or chipped.
12. Check the electrode tip settings. Replace electrodes if tips are
rounded.
13. Brush and vacuum any soot, lint, or foreign material out of the air
tube.
14. Remove fuel pump.
15. Remove and clean the pump strainer, if applicable. Replace the
cover gasket (or O-ring seal).
16. Use vacuum and a small brush to clean combustion air blower
wheel and vacuum any debris from the blower wheel area.
17. Clean cad cell grid surface, if necessary.
18. Visibly check the heat shield, burner head, and air tube for signs of
deterioration or damage.
19. Check all gaskets. Replace any that are damaged or would fail to
seal adequately.
20. Check the pump coupling for signs of wear or cracks. The coupling
should not be loose when placed on the motor shaft or the pump
shaft. If the coupling appears loose, worn, or has cracks, replace
the coupling.
21. Reinstall the pump coupling on the motor shaft and install the
pump. Rotate the pump until the flat spot on the shaft lines up with
the flat spot on the coupling. Do not force the pump shaft on to the
coupling.
22. Reinstall the nozzle assembly and tighten the assembly to the
burner housing with the splined nut.
23. Reconnect the connector tube assembly and tighten the flare fit-
ting.
24. Check the transformer spring contacts. If worn, replace.
25. Push the transformer up and forward checking to make sure the
springs are touching the electrode rods.
26. Put the transformer retaining clips in place and tighten the screws.
Cleaning the Heat Exchanger
Lower Heat Exchanger Access
1.
Turn off the electrical power to the unit and turn off oil supply at the
shut-off valve.
2.
Remove the blower and burner compartment access doors. Dis-
connect the oil piping at the valve on the oil pump to permit
removal of the entire burner from the vestibule panel.
3.
Disconnect the black and white wires at the terminals before the
electrical junction box. Remove the red and grey wires from the T
and T terminals on the right side of the control. Identify and note
the location of all leads for ease of reinstallation.
4.
Remove the screws holding the burner assembly to the vestibule
panel and remove this assembly. Handle the assembly carefully
since it contains the igniter which is fragile and easily broken. The
lower portion of the heat exchanger and chamber will now be
exposed. Using a vacuum cleaner, carefully clean bottom of the
chamber, if needed. Be careful not to damage the chamber when
vacuuming. Keep vacuum hose at an angle and slightly above sur-
face. Never touch the chamber with the vacuum hose.
5.
After cleaning is complete, replace all components in reverse
order. Re-gasket all surfaces which required a gasket. Reconnect
all wiring. Reattach vent pipe and oil lines before restoring service
to furnace. Restore electrical power, check oil piping for leaks, and
then verify furnace operation.
REPLACING THE OIL PUMP
To install a CleanCut fuel unit on chassis with existing shutter tab see
Figure 9 and follow these steps:
1.
Remove existing fuel unit and solenoid valves, if applicable, and
appropriately dispose of them.
2.
Install the new oil pump and solenoid valve. Adjust the air damper
to the original air setting and tighten screw securely.
NOTE: Do not install the top shutter screw, it will interfere with the sole-
noid on the fuel unit.
To install a CleanCut fuel unit on a housing with two upper mounting
screw holes, make sure the upper screw is installed in the hole closest
to the front of the burner (air tube side). See Figure 9.
Use care when removing and installing oil nozzles.
FIGURE 9: Mounting Pump
Upper Shutter Screw
