Bradford White PDX-75S-70FB-3X - Manual (Page 18)

Burner Cleaning
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 35.
Feedline nut
Pilot tubing nut
Igniter/flame
sense wire Step 4. Disconnect pilot tube (7/16 wrench) and
feedline (¾ wrench) from gas control.
Step 5. Disconnect igniter/flame sensor wire from gas control.
Step 6. Remove burner assembly from combustion chamber.
Step 7. Thoroughly inspect burner surface area and burner port area and
remove any loose debris.
Step 8. For cast iron burners, inspect for any debris build up inside
burner casting.
Burner
surface area
Burner
port area
Step 9. Unscrew burner from main burner
orifice. On cast iron burners, loosen
air shutter nut and unscrew feedline
from burner.
Step 10. Remove main burner orifice from
feedline (½" wrench on steel
burners, 3/8" wrench on cast iron)
inspect orifice, clean or replace if
necessary.
Step 11. Reassemble burner and reinstall into water heater. Restore gas supply
and check for gas leaks.
Step 12 To resume operation follow the instruction located on the lighting
instruction label or the lighting instruction located in the installation
and operating manual.
PDX SERVICE PROCEDURE I
Burner Operation Inspection,
Adjustment, Cleaning and Replacement
Page 18
L.P. Main burner
orifice. Left hand
thread
Main burner
orifice
PDX Series
18 18