Bradford White UPDX2-75T6FRN - Manual (Page 18)

UPDX SERVICE PROCEDURE II
Pilot Inspection, Cleaning 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 main burner
per service procedure XV, steps 1 through 9
on page 38.
Step 7. Remove pilot assembly from main burner (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.
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" (0.09") from pilot hood.
Step 11. Visually inspect igniter/flame sense electrode for oxidation
build up. Carefully clean any oxidation using very fine emery
cloth.
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 instructions located on the
lighting instructions label or the lighting instructions located in the
installation and operation manual.
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.
Ferrule
nut
Pilot
orifice
Pilot
hood
Igniter/flame sense
electrode
Igniter/flame sense
wire
Pilot
tubing
Page 18
UPDX Series
Pilot assembly Inspection, Cleaning and Replacement
Gas Control shown in the
“OFF” Position
¼” Hex Drive Pilot
Screw
Ferrule Nut
18