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Revision B (WB-I&O-Rev B) reflects changes made to the ratings page.
Revision C (WB-I&O-Rev C) reflects changes made to the orifice on
Models 150 and 210.
Revision D (ECO #C02407) reflects the addition of air inlet pipe
materials, Maintenance Section, high altitude, air pressure switch, new
condensate trap image and the addition of the new vent termination.
Revision E (ECO #C02545) reflects the addition of references to the
safety shutoff testing and instructions, sediment trap, periodic cleaning
of screens in vent terminations, wall thickness for direct vent
terminations, removal of B149.2 references, approval of the 2" and 3"
concentric vent kits for ULC-S636 and sidewall vent termination kit
number correction.
Revision F (ECO #C03223) reflects edits made to the high altitude
section on page 6.
WB-I-O Rev F
3/09