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Revision Notes: Revision B (AW-SER-Rev B) reflects the
addition of the Dungs information to the manual.
Revision C (ECO #C02407) reflects the addition of the air
pressure switch, FIG. 3-1, removal of pocket pc references and
changes made to the Circulation Pump section (page 15).
Revision D (ECO #C02545) reflects the addition of references
to periodic cleaning of screens in vent terminations and safety
shutoff testing and instructions.
Revision E (ECO #C02738) reflects the addition of the Gas
Valve Adjustment Procedure for a 399 model on page 33.
AW-SER Rev E
1/09