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Revision Notes: Revision A (ECO #C02299) initial release.
Revision B (ECO #C02870) reflects the addition of a mixing valve to the
piping diagrams (FIG.’s 6-2 and 6-3, pgs. 32 - 34).
Revision C (ECO #C02738) reflects edits made to the Gas Valve
Adjustment Procedure for Model SNA400-125 on page 69.
Revision D (ECO #C03223) reflects edits made to the high altitude
section on page 7.
SWH-I-S Rev D
3/09