Pilot inspection, testing and replacement – Bradford White M-2-TW-75T6BN User Manual

Page 17

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TTW 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 slide inner door open from left to
right.

Remove Outer

door.

Slide inner door open

from left to right.

Feedline nut

Pilot tubing nut

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.

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
build up. Carefully clean any oxidation using very fine emery
cloth.

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.

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.

Step 12.

Visually inspect pilot tubing for kinks or cracks. If damage is
found replace pilot.

Ferrule

nut

Pilot

orifice

Pilot

hood

Igniter/flame

sense electrode

Igniter/flame

sense wire

Pilot

tubing

Page 17

Page 17

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 inner door per service
procedure XIII on page 34.

17

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