American Water Heater GAS-FIRED COMMERCIAL WATER HEATER - Manual (Page 15)

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5. Connect the damper wiring plug to the connector on the side of the water
heater. Note: The plug and connector can only be engaged one way
(polarized).
6. The Lighting and Operating instructions are outlined beginning on
page 25. The damper must be in the open position when the water heater
main burner is operating (the arrow on the damper plate is in the “up”
position when open. Be certain the arrow is in a visible position when
installed).
Combustion Air Supply
CAUTION
Modification to the flue damper or the draft diverter may result in
personal injury, property damage or death. The flue damper and
draft diverter are to be placed in position and operate exactly as
stated in these instructions without modification.
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