Rev. 3 reflects the following:
Changes to: Fig. 3 on page 6, Fig. 10 on page 11, Pool Heater instructions and Fig. 17 on page 17, Fig. 19 on page 21, Table M on page 25, Mode 1 and Mode 4 instructions on page 33, Fig. 35 and Fig. 36 on page 33, Modes
Deletions: Vent Table on page 28 (identical to Table M on page 25)
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