Service Manual

Page 38

UPDX Series

Inner Door Removal Procedure

Step 1. Position gas control power switch to the “OFF” position

Step 2. Unplug the water heater from the wall outlet

Step 3. Turn off the gas supply to the water heater

Step 4. Remove the outer door.

Step 5. Remove the four (4) ¼” hex drive screws holding the

right side inner door in place

Step 6. Remove the three (3) ¼” hex drive screws

holding the left side burner door in place.

Step 7. Disconnect the spark igniter wire and the

flammable vapor sensor harness from the gas

control.

Step 8. Disconnect the pilot tube from the gas control using a

7/16" wrench. Remove the main burner feedline from

the gas control with a ¾” wren

ch.

Step 9. Remove the burner assembly from the combustion chamber.

Step 10. Fully inspect burner and inner door gaskets for the following:

>Tears >Other imperfections that will inhibit proper seal

>Missing Material >Gasket adhesion to inner door

>Cracks >Material left on combustion chamber (around opening)

>Dirt or debris

If the gasket is not affected by any of the above, gasket replacement is not required. If replacement is

required, proceed to Inner Door Gasket Replacement Procedure.

¼” Hex Drive Screws Right

Side Inner Door

¼” Hex Drive Screws at Flange

Area of Inner Door

¼” Hex Drive Screws on Left Side

Inner Door

WARNING

If the information in these instructions is not

followed exactly, afireor explosion mayresult causing

propertydamage, personal injury ordeath.

Gas Control shown in the “OFF” position

Flammable Vapor

Sensor Harness

Pilot Tube

Main Burner

Feedline

Spark Igniter Wire

UPDX SERVICE PROCEDUREXV

Inner Door/Gasket Removal, Inspection

Replacement and Reinstallation