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A. The Vent Damper is continuously powered at Terminal
1.
B. When there is a call for heat, the damper relay coil is
energized through Terminal 5 if all limits ahead of the
damper are satisfied.
C. The relay coil closes contacts which energize the
damper motor, causing the damper to open.
D. When the damper blade reaches the fully open posi-
tion, power is sent back to the ignition circuit through
Terminal 2 and the damper motor is de-energized.
E. When the call for heat is satisfied, the damper relay coil
is deenergized - closing contacts which energize the
damper motor. This causes the damper to close. When
the damper blade reaches the fully closed position, the
damper motor is de-energized.
POWER FAILURE - The damper blade will stop in the
position it was in when power failed. (Combustion can
never take place unless the damper blade is in the fully
open position.)
Figure 9: Vent Damper Schematic Wiring Diagram