Bradford-White Corp M450S, CX), M1XR403S*FCX, MI50L, MI504S, MI60T, MI40T Service Procedure RG-III

SERVICE PROCEDURE RG-III

Pilot Assembly Inspection, Cleaning and Replacement

PILOT/ELECTRODE ASSEMBLY INSPECTION, CLEANING AND REPLACEMENT

Step 1. Turn off gas supply to water heater. Rotate knob

of combination thermostat/gas valve to “OFF” position.

Step 2. Remove outer jacket door.

Step 3. Remove right side of inner door per SERVICE PROCEDURE RG-I, steps 3a through 3c.

For White Rodgers Control, depress knob slightly and rotate clockwise to the “OFF” position.

For Robertshaw Control, rotate knob clockwise to the “OFF” position.

Step 4 Disconnect thermocouple (3/8" wrench), pilot tube (7/16" wrench), and feedline (¾" wench) from combination thermostat/gas valve.

NOTE: Feedline nut for natural gas control

uses right hand threads, LP control uses left hand thread.

Step 5 Disconnect piezo ignition wire from piezo igniter.

Step 6. Remove burner assembly from combustion chamber.

Step 7. Remove pilot/electrode assembly from feedline (¼" drive tool)

Step 8. Inspect pilot for the following:

a)Primary air openings for blockage. Must be free from any debris (dirt, lint, etc).

	b) Kinks or cracks in the pilot tube. If found,	Primary Air
	the pilot must be replaced.	Opening
Step 9.	Inspect pilot orifice:

a)Remove ½" nut from bottom of pilot assembly.

b)Remove pilot tube and pilot orifice.

c)inspect pilot orifice for blockage, must be cleaned or replaced.

Step 10. Install pilot/electrode assembly to feedline, secure with screw from step 7.

Feedline

Nut

Pilot Orifice

Step 11. Re-Install burner assembly into combustion chamber, connect feedline, pilot tube and thermocouple to combination thermostat/gas valve.

Step 12. Install inner door per SERVICE PROCEDURE RG-I, step 4 through 13.

Step 13. To resume operation follow the instructions located on the lighting instruction label or the lighting instructions located in the installation and operation manual.

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