Door Gasket Replacement - A.O. Smith GPVL-50 Service Handbook

DOOR GASKET
Important: Use only factory authorized replacement parts.
If you lack the necessary skills to properly perform the
installation, you should not proceed, but get help from a
qualifi ed service technician.
Tools required:
•
3/4" Open-End Wrench
•
3/4" Scraper
•
Ratchet with 1/4" socket or 1/4" nutdriver
•
Flashlight
Removing Inner Door/Manifold/Burner Assembly
1. Set the gas control valve/thermostat to its lowest
setting by turning the knob counter-clockwise to the
VAC point (see Figure 3).
2. Turn gas control switch to the "OFF" position and turn
"OFF" the gas supply to the unit (see Figure 3).
3. Disconnect the electrical power to the water heater
from the wall outlet.
4. Remove the outer door from the unit.
5. Unplug all the electrical connections from the bottom
of the gas control valve/thermostat (see Figure 7).
6. Using a 3/4" open end wrench remove the manifold
tube from the gas control valve/thermostat (turning
counter-clockwise for natural gas, clockwise for L.P.).
Grasp the manifold tube and push down slightly to
free the manifold tube from the gas control valve/
thermostat (see Figure 7).
7. Remove the insulation pad on the inner door by cutting
it if necessary. Keep the insulation in a safe place for
reusing it later.
8. Use a 1/4" nutdriver or 1/4" socket & ratchet to loosen
the 2 hex head screws on the inner door so the inner
door/manifold/burner assembly can be removed (see
Figure 7).
9. Remove inner door/manifold/burner assembly by
grasping the manifold and pull back slowly. Rotating
it to the left to clear the igniter and fl ame sensor. Care
should be taken when inner door and burner assembly
passes through jacket opening that it does not damage
any of the electrical wiring (see Figure 9).
Removing The Door Gasket.
1. Locate the gasket that is on the rear of the burner door
assembly (see fi gure 17 - 19).
2. Pull off this gasket and using the 3/4" scraper, scrape
away and gasket stuck to the door.
3. Using the 3/4" scraper, clean around the combustion
chamber opening to ensure no old gasket material is
stuck on the combustion chamber (Figure 17). Use
the fl ashlight to clearly illuminate this area. Take care
not to damage the mounting clips located on each
side of the opening.
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DOOR GASKET REPLACEMENT