Revision A (ECO #C05747) initial release. Reflects the new model numbers for the Knight Wall Mount upgrade.

Revision B (ECO #C06188) reflects updates made to the ladder and wiring diagrams (ECO #C06158).

Revision C (ECO #C06234) reflects changes made to the Service Reminder feature.

Revision D (ECO #C08222) reflects the new layout in InDesign, the addition of the rope gasket, along with changes to the water pipe clearances from 1" to a 1/4" (ECR #R04077), pages 7, 8, and 33.

Revision E (ECO #C09161) reflects additional information added to the humidity warning on page 7, along with updates made to the SMART SYSTEM control (ECR #R04523).

Revision F (ECO #C09803) reflects the addition of the new Polypropylene Vent material section, rearranging the venting section, and the addition of the AHRI and ASME logos (R05009).

Revision G (ECO #C10143) reflects updates made to the ignition timing information.

Revision H (ECO #C10297) reflects the removal of a venting notice on page 16.

Revision I (ECO #C10450) reflects changes made to Table 10A on page 61.

WBII-I-O Rev I 05/12

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Lochinvar 51-211 operation manual