Honeywell PDX150S*F(BN,SX,CX) service manual Pilot Inspection, Testing and Replacement, PDX Series

PDX Series

PDX SERVICE PROCEDURE II

Pilot testing, Cleaning and Replacement

Pilot Inspection, Testing and Replacement

Step 1. Position gas control power switch to the “OFF” position and unplug heater from wall outlet.

Step 2. Turn off gas supply to water heater.

Step 3. Remove outer jacket door and remove inner door per service proceedure XIII on page 35.

Igniter/flame

sense wire

Step 4. Disconnect pilot tube nut (7/16 wrench) and feedline nut (¾ wrench) from gas control.

Step 5. Disconnect igniter/flame sense wire from gas control.

Step 6. Remove burner assembly from combustion chamber.

Step 7. Remove pilot assembly from feedline (¼" nut driver).

Step 8. Visually inspect igniter/flame sense wire for damage. Replace pilot if damage is found.

Step 9. With a multi-meter set to the ohms setting, check continuity through igniter/flame sense wire. Replace pilot if no continuity.

Ferrule	Pilot	Pilot
nut	tubing	orifice

Feedline nut

Pilot tubing nut

Pilot

hood

Step 10.	Visually inspect igniter/flame sense electrode for deterioration.
	Replace pilot as necessary. Electrode should not be in contact
	with pilot hood, If so, carefully adjust electrode to a gap
	distance of 3/32" (.09) from pilot hood.
Step 11.	Visually inspect igniter/flame sense electrode for oxidation	Igniter/flame sense
			wire
	build up. Carefully clean any oxidation using very fine emery
	cloth.
Step 12.	Visually inspect pilot tubing for kinks or cracks. If damage is
	found replace pilot.
Step 13.	Inspect pilot tubing and pilot orifice for blockage:

a) Remove ferrule nut from bottom of pilot assembly (7/16" wrench). b) Remove pilot tube and pilot orifice.

c) Inspect pilot tubing and pilot orifice for blockage. Clean or replace as necessary.

Igniter/flame sense

electrode

Step 14. Reassemble pilot and install to feedline. Reinstall burner assembly to water heater. Restore gas supply and check for gas leaks.

Step 15 To resume operation follow the instruction located on the lighting instruction label or the lighting instruction located in the installation and operating manual.

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