Replacing The Oil Pump - York International DFAA User's Information, Maintenance And Service Manual

High efficiency sealed combustion drum heat exchanger series

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Table of Contents

Use care when removing and installing oil nozzles.

• 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.

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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

Turn off the electrical power to the unit and turn off oil supply at the

shut-off valve.

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.

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.

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.

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.